1145 lines
40 KiB
C
1145 lines
40 KiB
C
/*!**************************************************************************
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*!
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*! FILE NAME : kgdb.c
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*!
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*! DESCRIPTION: Implementation of the gdb stub with respect to ETRAX 100.
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*! It is a mix of arch/m68k/kernel/kgdb.c and cris_stub.c.
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*!
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*!---------------------------------------------------------------------------
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*! HISTORY
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*!
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*! DATE NAME CHANGES
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*! ---- ---- -------
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*! Apr 26 1999 Hendrik Ruijter Initial version.
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*! May 6 1999 Hendrik Ruijter Removed call to strlen in libc and removed
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*! struct assignment as it generates calls to
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*! memcpy in libc.
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*! Jun 17 1999 Hendrik Ruijter Added gdb 4.18 support. 'X', 'qC' and 'qL'.
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*! Jul 21 1999 Bjorn Wesen eLinux port
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*!
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*!---------------------------------------------------------------------------
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*!
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*! (C) Copyright 1999, Axis Communications AB, LUND, SWEDEN
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*!
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*!**************************************************************************/
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/* @(#) cris_stub.c 1.3 06/17/99 */
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/*
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* kgdb usage notes:
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* -----------------
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*
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* If you select CONFIG_ETRAX_KGDB in the configuration, the kernel will be
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* built with different gcc flags: "-g" is added to get debug infos, and
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* "-fomit-frame-pointer" is omitted to make debugging easier. Since the
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* resulting kernel will be quite big (approx. > 7 MB), it will be stripped
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* before compresion. Such a kernel will behave just as usually, except if
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* given a "debug=<device>" command line option. (Only serial devices are
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* allowed for <device>, i.e. no printers or the like; possible values are
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* machine depedend and are the same as for the usual debug device, the one
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* for logging kernel messages.) If that option is given and the device can be
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* initialized, the kernel will connect to the remote gdb in trap_init(). The
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* serial parameters are fixed to 8N1 and 115200 bps, for easyness of
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* implementation.
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*
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* To start a debugging session, start that gdb with the debugging kernel
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* image (the one with the symbols, vmlinux.debug) named on the command line.
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* This file will be used by gdb to get symbol and debugging infos about the
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* kernel. Next, select remote debug mode by
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* target remote <device>
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* where <device> is the name of the serial device over which the debugged
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* machine is connected. Maybe you have to adjust the baud rate by
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* set remotebaud <rate>
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* or also other parameters with stty:
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* shell stty ... </dev/...
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* If the kernel to debug has already booted, it waited for gdb and now
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* connects, and you'll see a breakpoint being reported. If the kernel isn't
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* running yet, start it now. The order of gdb and the kernel doesn't matter.
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* Another thing worth knowing about in the getting-started phase is how to
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* debug the remote protocol itself. This is activated with
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* set remotedebug 1
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* gdb will then print out each packet sent or received. You'll also get some
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* messages about the gdb stub on the console of the debugged machine.
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*
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* If all that works, you can use lots of the usual debugging techniques on
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* the kernel, e.g. inspecting and changing variables/memory, setting
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* breakpoints, single stepping and so on. It's also possible to interrupt the
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* debugged kernel by pressing C-c in gdb. Have fun! :-)
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*
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* The gdb stub is entered (and thus the remote gdb gets control) in the
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* following situations:
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*
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* - If breakpoint() is called. This is just after kgdb initialization, or if
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* a breakpoint() call has been put somewhere into the kernel source.
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* (Breakpoints can of course also be set the usual way in gdb.)
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* In eLinux, we call breakpoint() in init/main.c after IRQ initialization.
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*
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* - If there is a kernel exception, i.e. bad_super_trap() or die_if_kernel()
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* are entered. All the CPU exceptions are mapped to (more or less..., see
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* the hard_trap_info array below) appropriate signal, which are reported
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* to gdb. die_if_kernel() is usually called after some kind of access
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* error and thus is reported as SIGSEGV.
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*
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* - When panic() is called. This is reported as SIGABRT.
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*
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* - If C-c is received over the serial line, which is treated as
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* SIGINT.
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*
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* Of course, all these signals are just faked for gdb, since there is no
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* signal concept as such for the kernel. It also isn't possible --obviously--
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* to set signal handlers from inside gdb, or restart the kernel with a
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* signal.
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*
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* Current limitations:
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*
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* - While the kernel is stopped, interrupts are disabled for safety reasons
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* (i.e., variables not changing magically or the like). But this also
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* means that the clock isn't running anymore, and that interrupts from the
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* hardware may get lost/not be served in time. This can cause some device
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* errors...
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*
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* - When single-stepping, only one instruction of the current thread is
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* executed, but interrupts are allowed for that time and will be serviced
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* if pending. Be prepared for that.
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*
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* - All debugging happens in kernel virtual address space. There's no way to
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* access physical memory not mapped in kernel space, or to access user
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* space. A way to work around this is using get_user_long & Co. in gdb
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* expressions, but only for the current process.
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*
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* - Interrupting the kernel only works if interrupts are currently allowed,
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* and the interrupt of the serial line isn't blocked by some other means
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* (IPL too high, disabled, ...)
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*
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* - The gdb stub is currently not reentrant, i.e. errors that happen therein
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* (e.g. accessing invalid memory) may not be caught correctly. This could
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* be removed in future by introducing a stack of struct registers.
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*
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*/
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/*
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* To enable debugger support, two things need to happen. One, a
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* call to kgdb_init() is necessary in order to allow any breakpoints
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* or error conditions to be properly intercepted and reported to gdb.
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* Two, a breakpoint needs to be generated to begin communication. This
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* is most easily accomplished by a call to breakpoint().
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*
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* The following gdb commands are supported:
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*
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* command function Return value
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*
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* g return the value of the CPU registers hex data or ENN
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* G set the value of the CPU registers OK or ENN
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*
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* mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
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* MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
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*
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* c Resume at current address SNN ( signal NN)
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* cAA..AA Continue at address AA..AA SNN
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*
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* s Step one instruction SNN
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* sAA..AA Step one instruction from AA..AA SNN
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*
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* k kill
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*
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* ? What was the last sigval ? SNN (signal NN)
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*
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* bBB..BB Set baud rate to BB..BB OK or BNN, then sets
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* baud rate
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*
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* All commands and responses are sent with a packet which includes a
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* checksum. A packet consists of
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*
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* $<packet info>#<checksum>.
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*
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* where
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* <packet info> :: <characters representing the command or response>
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* <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>>
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*
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* When a packet is received, it is first acknowledged with either '+' or '-'.
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* '+' indicates a successful transfer. '-' indicates a failed transfer.
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*
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* Example:
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*
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* Host: Reply:
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* $m0,10#2a +$00010203040506070809101112131415#42
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*
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*/
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#include <linux/string.h>
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/linkage.h>
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#include <linux/reboot.h>
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#include <asm/setup.h>
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#include <asm/ptrace.h>
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#include <arch/svinto.h>
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#include <asm/irq.h>
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static int kgdb_started = 0;
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/********************************* Register image ****************************/
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/* Use the order of registers as defined in "AXIS ETRAX CRIS Programmer's
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Reference", p. 1-1, with the additional register definitions of the
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ETRAX 100LX in cris-opc.h.
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There are 16 general 32-bit registers, R0-R15, where R14 is the stack
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pointer, SP, and R15 is the program counter, PC.
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There are 16 special registers, P0-P15, where three of the unimplemented
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registers, P0, P4 and P8, are reserved as zero-registers. A read from
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any of these registers returns zero and a write has no effect. */
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typedef
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struct register_image
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{
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/* Offset */
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unsigned int r0; /* 0x00 */
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unsigned int r1; /* 0x04 */
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unsigned int r2; /* 0x08 */
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unsigned int r3; /* 0x0C */
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unsigned int r4; /* 0x10 */
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unsigned int r5; /* 0x14 */
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unsigned int r6; /* 0x18 */
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unsigned int r7; /* 0x1C */
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unsigned int r8; /* 0x20 Frame pointer */
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unsigned int r9; /* 0x24 */
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unsigned int r10; /* 0x28 */
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unsigned int r11; /* 0x2C */
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unsigned int r12; /* 0x30 */
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unsigned int r13; /* 0x34 */
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unsigned int sp; /* 0x38 Stack pointer */
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unsigned int pc; /* 0x3C Program counter */
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unsigned char p0; /* 0x40 8-bit zero-register */
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unsigned char vr; /* 0x41 Version register */
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unsigned short p4; /* 0x42 16-bit zero-register */
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unsigned short ccr; /* 0x44 Condition code register */
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unsigned int mof; /* 0x46 Multiply overflow register */
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unsigned int p8; /* 0x4A 32-bit zero-register */
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unsigned int ibr; /* 0x4E Interrupt base register */
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unsigned int irp; /* 0x52 Interrupt return pointer */
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unsigned int srp; /* 0x56 Subroutine return pointer */
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unsigned int bar; /* 0x5A Breakpoint address register */
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unsigned int dccr; /* 0x5E Double condition code register */
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unsigned int brp; /* 0x62 Breakpoint return pointer (pc in caller) */
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unsigned int usp; /* 0x66 User mode stack pointer */
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} registers;
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/* Serial port, reads one character. ETRAX 100 specific. from debugport.c */
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int getDebugChar (void);
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/* Serial port, writes one character. ETRAX 100 specific. from debugport.c */
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void putDebugChar (int val);
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void enableDebugIRQ (void);
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/******************** Prototypes for global functions. ***********************/
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/* The string str is prepended with the GDB printout token and sent. */
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void putDebugString (const unsigned char *str, int length); /* used by etrax100ser.c */
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/* The hook for both static (compiled) and dynamic breakpoints set by GDB.
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ETRAX 100 specific. */
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void handle_breakpoint (void); /* used by irq.c */
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/* The hook for an interrupt generated by GDB. ETRAX 100 specific. */
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void handle_interrupt (void); /* used by irq.c */
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/* A static breakpoint to be used at startup. */
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void breakpoint (void); /* called by init/main.c */
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/* From osys_int.c, executing_task contains the number of the current
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executing task in osys. Does not know of object-oriented threads. */
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extern unsigned char executing_task;
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/* The number of characters used for a 64 bit thread identifier. */
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#define HEXCHARS_IN_THREAD_ID 16
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/********************************** Packet I/O ******************************/
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/* BUFMAX defines the maximum number of characters in
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inbound/outbound buffers */
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#define BUFMAX 512
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/* Run-length encoding maximum length. Send 64 at most. */
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#define RUNLENMAX 64
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/* The inbound/outbound buffers used in packet I/O */
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static char remcomInBuffer[BUFMAX];
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static char remcomOutBuffer[BUFMAX];
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/* Error and warning messages. */
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enum error_type
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{
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SUCCESS, E01, E02, E03, E04, E05, E06, E07
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};
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static char *error_message[] =
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{
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"",
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"E01 Set current or general thread - H[c,g] - internal error.",
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"E02 Change register content - P - cannot change read-only register.",
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"E03 Thread is not alive.", /* T, not used. */
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"E04 The command is not supported - [s,C,S,!,R,d,r] - internal error.",
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"E05 Change register content - P - the register is not implemented..",
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"E06 Change memory content - M - internal error.",
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"E07 Change register content - P - the register is not stored on the stack"
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};
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/********************************* Register image ****************************/
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/* Use the order of registers as defined in "AXIS ETRAX CRIS Programmer's
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Reference", p. 1-1, with the additional register definitions of the
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ETRAX 100LX in cris-opc.h.
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There are 16 general 32-bit registers, R0-R15, where R14 is the stack
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pointer, SP, and R15 is the program counter, PC.
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There are 16 special registers, P0-P15, where three of the unimplemented
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registers, P0, P4 and P8, are reserved as zero-registers. A read from
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any of these registers returns zero and a write has no effect. */
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enum register_name
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{
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R0, R1, R2, R3,
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R4, R5, R6, R7,
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R8, R9, R10, R11,
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R12, R13, SP, PC,
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P0, VR, P2, P3,
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P4, CCR, P6, MOF,
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P8, IBR, IRP, SRP,
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BAR, DCCR, BRP, USP
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};
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/* The register sizes of the registers in register_name. An unimplemented register
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is designated by size 0 in this array. */
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static int register_size[] =
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{
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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1, 1, 0, 0,
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2, 2, 0, 4,
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4, 4, 4, 4,
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4, 4, 4, 4
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};
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/* Contains the register image of the executing thread in the assembler
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part of the code in order to avoid horrible addressing modes. */
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registers cris_reg;
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/* FIXME: Should this be used? Delete otherwise. */
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/* Contains the assumed consistency state of the register image. Uses the
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enum error_type for state information. */
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static int consistency_status = SUCCESS;
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/********************************** Handle exceptions ************************/
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/* The variable cris_reg contains the register image associated with the
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current_thread_c variable. It is a complete register image created at
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entry. The reg_g contains a register image of a task where the general
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registers are taken from the stack and all special registers are taken
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from the executing task. It is associated with current_thread_g and used
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in order to provide access mainly for 'g', 'G' and 'P'.
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*/
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/********************************** Breakpoint *******************************/
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/* Use an internal stack in the breakpoint and interrupt response routines */
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#define INTERNAL_STACK_SIZE 1024
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char internal_stack[INTERNAL_STACK_SIZE];
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/* Due to the breakpoint return pointer, a state variable is needed to keep
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track of whether it is a static (compiled) or dynamic (gdb-invoked)
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breakpoint to be handled. A static breakpoint uses the content of register
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BRP as it is whereas a dynamic breakpoint requires subtraction with 2
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in order to execute the instruction. The first breakpoint is static. */
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static unsigned char is_dyn_brkp = 0;
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/********************************* String library ****************************/
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/* Single-step over library functions creates trap loops. */
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/* Copy char s2[] to s1[]. */
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static char*
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gdb_cris_strcpy (char *s1, const char *s2)
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{
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char *s = s1;
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for (s = s1; (*s++ = *s2++) != '\0'; )
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;
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return (s1);
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}
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/* Find length of s[]. */
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static int
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gdb_cris_strlen (const char *s)
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{
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const char *sc;
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for (sc = s; *sc != '\0'; sc++)
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;
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return (sc - s);
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}
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/* Find first occurrence of c in s[n]. */
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static void*
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gdb_cris_memchr (const void *s, int c, int n)
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{
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const unsigned char uc = c;
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const unsigned char *su;
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for (su = s; 0 < n; ++su, --n)
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if (*su == uc)
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return ((void *)su);
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return (NULL);
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}
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/******************************* Standard library ****************************/
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/* Single-step over library functions creates trap loops. */
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/* Convert string to long. */
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static int
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gdb_cris_strtol (const char *s, char **endptr, int base)
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{
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char *s1;
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char *sd;
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int x = 0;
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for (s1 = (char*)s; (sd = gdb_cris_memchr(hex_asc, *s1, base)) != NULL; ++s1)
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x = x * base + (sd - hex_asc);
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if (endptr)
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{
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/* Unconverted suffix is stored in endptr unless endptr is NULL. */
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*endptr = s1;
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}
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return x;
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}
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/********************************** Packet I/O ******************************/
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/* Returns the integer equivalent of a hexadecimal character. */
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static int
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hex (char ch)
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{
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if ((ch >= 'a') && (ch <= 'f'))
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return (ch - 'a' + 10);
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if ((ch >= '0') && (ch <= '9'))
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return (ch - '0');
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if ((ch >= 'A') && (ch <= 'F'))
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return (ch - 'A' + 10);
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return (-1);
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}
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/* Convert the memory, pointed to by mem into hexadecimal representation.
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Put the result in buf, and return a pointer to the last character
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in buf (null). */
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static char *
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mem2hex(char *buf, unsigned char *mem, int count)
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{
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int i;
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int ch;
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if (mem == NULL) {
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/* Bogus read from m0. FIXME: What constitutes a valid address? */
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for (i = 0; i < count; i++) {
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*buf++ = '0';
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*buf++ = '0';
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}
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} else {
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/* Valid mem address. */
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for (i = 0; i < count; i++) {
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ch = *mem++;
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buf = hex_byte_pack(buf, ch);
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}
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}
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/* Terminate properly. */
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*buf = '\0';
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return (buf);
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}
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/* Convert the array, in hexadecimal representation, pointed to by buf into
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binary representation. Put the result in mem, and return a pointer to
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the character after the last byte written. */
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static unsigned char*
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hex2mem (unsigned char *mem, char *buf, int count)
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{
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int i;
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unsigned char ch;
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for (i = 0; i < count; i++) {
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ch = hex (*buf++) << 4;
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ch = ch + hex (*buf++);
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*mem++ = ch;
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}
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return (mem);
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}
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/* Put the content of the array, in binary representation, pointed to by buf
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into memory pointed to by mem, and return a pointer to the character after
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the last byte written.
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Gdb will escape $, #, and the escape char (0x7d). */
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static unsigned char*
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bin2mem (unsigned char *mem, unsigned char *buf, int count)
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{
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int i;
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|
unsigned char *next;
|
|
for (i = 0; i < count; i++) {
|
|
/* Check for any escaped characters. Be paranoid and
|
|
only unescape chars that should be escaped. */
|
|
if (*buf == 0x7d) {
|
|
next = buf + 1;
|
|
if (*next == 0x3 || *next == 0x4 || *next == 0x5D) /* #, $, ESC */
|
|
{
|
|
buf++;
|
|
*buf += 0x20;
|
|
}
|
|
}
|
|
*mem++ = *buf++;
|
|
}
|
|
return (mem);
|
|
}
|
|
|
|
/* Await the sequence $<data>#<checksum> and store <data> in the array buffer
|
|
returned. */
|
|
static void
|
|
getpacket (char *buffer)
|
|
{
|
|
unsigned char checksum;
|
|
unsigned char xmitcsum;
|
|
int i;
|
|
int count;
|
|
char ch;
|
|
do {
|
|
while ((ch = getDebugChar ()) != '$')
|
|
/* Wait for the start character $ and ignore all other characters */;
|
|
checksum = 0;
|
|
xmitcsum = -1;
|
|
count = 0;
|
|
/* Read until a # or the end of the buffer is reached */
|
|
while (count < BUFMAX - 1) {
|
|
ch = getDebugChar ();
|
|
if (ch == '#')
|
|
break;
|
|
checksum = checksum + ch;
|
|
buffer[count] = ch;
|
|
count = count + 1;
|
|
}
|
|
buffer[count] = '\0';
|
|
|
|
if (ch == '#') {
|
|
xmitcsum = hex (getDebugChar ()) << 4;
|
|
xmitcsum += hex (getDebugChar ());
|
|
if (checksum != xmitcsum) {
|
|
/* Wrong checksum */
|
|
putDebugChar ('-');
|
|
}
|
|
else {
|
|
/* Correct checksum */
|
|
putDebugChar ('+');
|
|
/* If sequence characters are received, reply with them */
|
|
if (buffer[2] == ':') {
|
|
putDebugChar (buffer[0]);
|
|
putDebugChar (buffer[1]);
|
|
/* Remove the sequence characters from the buffer */
|
|
count = gdb_cris_strlen (buffer);
|
|
for (i = 3; i <= count; i++)
|
|
buffer[i - 3] = buffer[i];
|
|
}
|
|
}
|
|
}
|
|
} while (checksum != xmitcsum);
|
|
}
|
|
|
|
/* Send $<data>#<checksum> from the <data> in the array buffer. */
|
|
|
|
static void
|
|
putpacket(char *buffer)
|
|
{
|
|
int checksum;
|
|
int runlen;
|
|
int encode;
|
|
|
|
do {
|
|
char *src = buffer;
|
|
putDebugChar ('$');
|
|
checksum = 0;
|
|
while (*src) {
|
|
/* Do run length encoding */
|
|
putDebugChar (*src);
|
|
checksum += *src;
|
|
runlen = 0;
|
|
while (runlen < RUNLENMAX && *src == src[runlen]) {
|
|
runlen++;
|
|
}
|
|
if (runlen > 3) {
|
|
/* Got a useful amount */
|
|
putDebugChar ('*');
|
|
checksum += '*';
|
|
encode = runlen + ' ' - 4;
|
|
putDebugChar (encode);
|
|
checksum += encode;
|
|
src += runlen;
|
|
}
|
|
else {
|
|
src++;
|
|
}
|
|
}
|
|
putDebugChar('#');
|
|
putDebugChar(hex_asc_hi(checksum));
|
|
putDebugChar(hex_asc_lo(checksum));
|
|
} while(kgdb_started && (getDebugChar() != '+'));
|
|
}
|
|
|
|
/* The string str is prepended with the GDB printout token and sent. Required
|
|
in traditional implementations. */
|
|
void
|
|
putDebugString (const unsigned char *str, int length)
|
|
{
|
|
remcomOutBuffer[0] = 'O';
|
|
mem2hex(&remcomOutBuffer[1], (unsigned char *)str, length);
|
|
putpacket(remcomOutBuffer);
|
|
}
|
|
|
|
/********************************* Register image ****************************/
|
|
/* Write a value to a specified register in the register image of the current
|
|
thread. Returns status code SUCCESS, E02 or E05. */
|
|
static int
|
|
write_register (int regno, char *val)
|
|
{
|
|
int status = SUCCESS;
|
|
registers *current_reg = &cris_reg;
|
|
|
|
if (regno >= R0 && regno <= PC) {
|
|
/* 32-bit register with simple offset. */
|
|
hex2mem ((unsigned char *)current_reg + regno * sizeof(unsigned int),
|
|
val, sizeof(unsigned int));
|
|
}
|
|
else if (regno == P0 || regno == VR || regno == P4 || regno == P8) {
|
|
/* Do not support read-only registers. */
|
|
status = E02;
|
|
}
|
|
else if (regno == CCR) {
|
|
/* 16 bit register with complex offset. (P4 is read-only, P6 is not implemented,
|
|
and P7 (MOF) is 32 bits in ETRAX 100LX. */
|
|
hex2mem ((unsigned char *)&(current_reg->ccr) + (regno-CCR) * sizeof(unsigned short),
|
|
val, sizeof(unsigned short));
|
|
}
|
|
else if (regno >= MOF && regno <= USP) {
|
|
/* 32 bit register with complex offset. (P8 has been taken care of.) */
|
|
hex2mem ((unsigned char *)&(current_reg->ibr) + (regno-IBR) * sizeof(unsigned int),
|
|
val, sizeof(unsigned int));
|
|
}
|
|
else {
|
|
/* Do not support nonexisting or unimplemented registers (P2, P3, and P6). */
|
|
status = E05;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* Read a value from a specified register in the register image. Returns the
|
|
value in the register or -1 for non-implemented registers.
|
|
Should check consistency_status after a call which may be E05 after changes
|
|
in the implementation. */
|
|
static int
|
|
read_register (char regno, unsigned int *valptr)
|
|
{
|
|
registers *current_reg = &cris_reg;
|
|
|
|
if (regno >= R0 && regno <= PC) {
|
|
/* 32-bit register with simple offset. */
|
|
*valptr = *(unsigned int *)((char *)current_reg + regno * sizeof(unsigned int));
|
|
return SUCCESS;
|
|
}
|
|
else if (regno == P0 || regno == VR) {
|
|
/* 8 bit register with complex offset. */
|
|
*valptr = (unsigned int)(*(unsigned char *)
|
|
((char *)&(current_reg->p0) + (regno-P0) * sizeof(char)));
|
|
return SUCCESS;
|
|
}
|
|
else if (regno == P4 || regno == CCR) {
|
|
/* 16 bit register with complex offset. */
|
|
*valptr = (unsigned int)(*(unsigned short *)
|
|
((char *)&(current_reg->p4) + (regno-P4) * sizeof(unsigned short)));
|
|
return SUCCESS;
|
|
}
|
|
else if (regno >= MOF && regno <= USP) {
|
|
/* 32 bit register with complex offset. */
|
|
*valptr = *(unsigned int *)((char *)&(current_reg->p8)
|
|
+ (regno-P8) * sizeof(unsigned int));
|
|
return SUCCESS;
|
|
}
|
|
else {
|
|
/* Do not support nonexisting or unimplemented registers (P2, P3, and P6). */
|
|
consistency_status = E05;
|
|
return E05;
|
|
}
|
|
}
|
|
|
|
/********************************** Handle exceptions ************************/
|
|
/* Build and send a response packet in order to inform the host the
|
|
stub is stopped. TAAn...:r...;n...:r...;n...:r...;
|
|
AA = signal number
|
|
n... = register number (hex)
|
|
r... = register contents
|
|
n... = `thread'
|
|
r... = thread process ID. This is a hex integer.
|
|
n... = other string not starting with valid hex digit.
|
|
gdb should ignore this n,r pair and go on to the next.
|
|
This way we can extend the protocol. */
|
|
static void
|
|
stub_is_stopped(int sigval)
|
|
{
|
|
char *ptr = remcomOutBuffer;
|
|
int regno;
|
|
|
|
unsigned int reg_cont;
|
|
int status;
|
|
|
|
/* Send trap type (converted to signal) */
|
|
|
|
*ptr++ = 'T';
|
|
ptr = hex_byte_pack(ptr, sigval);
|
|
|
|
/* Send register contents. We probably only need to send the
|
|
* PC, frame pointer and stack pointer here. Other registers will be
|
|
* explicitly asked for. But for now, send all.
|
|
*/
|
|
|
|
for (regno = R0; regno <= USP; regno++) {
|
|
/* Store n...:r...; for the registers in the buffer. */
|
|
|
|
status = read_register (regno, ®_cont);
|
|
|
|
if (status == SUCCESS) {
|
|
ptr = hex_byte_pack(ptr, regno);
|
|
*ptr++ = ':';
|
|
|
|
ptr = mem2hex(ptr, (unsigned char *)®_cont,
|
|
register_size[regno]);
|
|
*ptr++ = ';';
|
|
}
|
|
|
|
}
|
|
|
|
/* null-terminate and send it off */
|
|
|
|
*ptr = 0;
|
|
|
|
putpacket (remcomOutBuffer);
|
|
}
|
|
|
|
/* Performs a complete re-start from scratch. */
|
|
static void
|
|
kill_restart (void)
|
|
{
|
|
machine_restart("");
|
|
}
|
|
|
|
/* All expected commands are sent from remote.c. Send a response according
|
|
to the description in remote.c. */
|
|
void
|
|
handle_exception (int sigval)
|
|
{
|
|
/* Send response. */
|
|
|
|
stub_is_stopped (sigval);
|
|
|
|
for (;;) {
|
|
remcomOutBuffer[0] = '\0';
|
|
getpacket (remcomInBuffer);
|
|
switch (remcomInBuffer[0]) {
|
|
case 'g':
|
|
/* Read registers: g
|
|
Success: Each byte of register data is described by two hex digits.
|
|
Registers are in the internal order for GDB, and the bytes
|
|
in a register are in the same order the machine uses.
|
|
Failure: void. */
|
|
|
|
mem2hex(remcomOutBuffer, (char *)&cris_reg, sizeof(registers));
|
|
break;
|
|
|
|
case 'G':
|
|
/* Write registers. GXX..XX
|
|
Each byte of register data is described by two hex digits.
|
|
Success: OK
|
|
Failure: void. */
|
|
hex2mem((char *)&cris_reg, &remcomInBuffer[1], sizeof(registers));
|
|
gdb_cris_strcpy (remcomOutBuffer, "OK");
|
|
break;
|
|
|
|
case 'P':
|
|
/* Write register. Pn...=r...
|
|
Write register n..., hex value without 0x, with value r...,
|
|
which contains a hex value without 0x and two hex digits
|
|
for each byte in the register (target byte order). P1f=11223344 means
|
|
set register 31 to 44332211.
|
|
Success: OK
|
|
Failure: E02, E05 */
|
|
{
|
|
char *suffix;
|
|
int regno = gdb_cris_strtol (&remcomInBuffer[1], &suffix, 16);
|
|
int status;
|
|
status = write_register (regno, suffix+1);
|
|
|
|
switch (status) {
|
|
case E02:
|
|
/* Do not support read-only registers. */
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E02]);
|
|
break;
|
|
case E05:
|
|
/* Do not support non-existing registers. */
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E05]);
|
|
break;
|
|
case E07:
|
|
/* Do not support non-existing registers on the stack. */
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E07]);
|
|
break;
|
|
default:
|
|
/* Valid register number. */
|
|
gdb_cris_strcpy (remcomOutBuffer, "OK");
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 'm':
|
|
/* Read from memory. mAA..AA,LLLL
|
|
AA..AA is the address and LLLL is the length.
|
|
Success: XX..XX is the memory content. Can be fewer bytes than
|
|
requested if only part of the data may be read. m6000120a,6c means
|
|
retrieve 108 byte from base address 6000120a.
|
|
Failure: void. */
|
|
{
|
|
char *suffix;
|
|
unsigned char *addr = (unsigned char *)gdb_cris_strtol(&remcomInBuffer[1],
|
|
&suffix, 16); int length = gdb_cris_strtol(suffix+1, 0, 16);
|
|
|
|
mem2hex(remcomOutBuffer, addr, length);
|
|
}
|
|
break;
|
|
|
|
case 'X':
|
|
/* Write to memory. XAA..AA,LLLL:XX..XX
|
|
AA..AA is the start address, LLLL is the number of bytes, and
|
|
XX..XX is the binary data.
|
|
Success: OK
|
|
Failure: void. */
|
|
case 'M':
|
|
/* Write to memory. MAA..AA,LLLL:XX..XX
|
|
AA..AA is the start address, LLLL is the number of bytes, and
|
|
XX..XX is the hexadecimal data.
|
|
Success: OK
|
|
Failure: void. */
|
|
{
|
|
char *lenptr;
|
|
char *dataptr;
|
|
unsigned char *addr = (unsigned char *)gdb_cris_strtol(&remcomInBuffer[1],
|
|
&lenptr, 16);
|
|
int length = gdb_cris_strtol(lenptr+1, &dataptr, 16);
|
|
if (*lenptr == ',' && *dataptr == ':') {
|
|
if (remcomInBuffer[0] == 'M') {
|
|
hex2mem(addr, dataptr + 1, length);
|
|
}
|
|
else /* X */ {
|
|
bin2mem(addr, dataptr + 1, length);
|
|
}
|
|
gdb_cris_strcpy (remcomOutBuffer, "OK");
|
|
}
|
|
else {
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E06]);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 'c':
|
|
/* Continue execution. cAA..AA
|
|
AA..AA is the address where execution is resumed. If AA..AA is
|
|
omitted, resume at the present address.
|
|
Success: return to the executing thread.
|
|
Failure: will never know. */
|
|
if (remcomInBuffer[1] != '\0') {
|
|
cris_reg.pc = gdb_cris_strtol (&remcomInBuffer[1], 0, 16);
|
|
}
|
|
enableDebugIRQ();
|
|
return;
|
|
|
|
case 's':
|
|
/* Step. sAA..AA
|
|
AA..AA is the address where execution is resumed. If AA..AA is
|
|
omitted, resume at the present address. Success: return to the
|
|
executing thread. Failure: will never know.
|
|
|
|
Should never be invoked. The single-step is implemented on
|
|
the host side. If ever invoked, it is an internal error E04. */
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E04]);
|
|
putpacket (remcomOutBuffer);
|
|
return;
|
|
|
|
case '?':
|
|
/* The last signal which caused a stop. ?
|
|
Success: SAA, where AA is the signal number.
|
|
Failure: void. */
|
|
remcomOutBuffer[0] = 'S';
|
|
remcomOutBuffer[1] = hex_asc_hi(sigval);
|
|
remcomOutBuffer[2] = hex_asc_lo(sigval);
|
|
remcomOutBuffer[3] = 0;
|
|
break;
|
|
|
|
case 'D':
|
|
/* Detach from host. D
|
|
Success: OK, and return to the executing thread.
|
|
Failure: will never know */
|
|
putpacket ("OK");
|
|
return;
|
|
|
|
case 'k':
|
|
case 'r':
|
|
/* kill request or reset request.
|
|
Success: restart of target.
|
|
Failure: will never know. */
|
|
kill_restart ();
|
|
break;
|
|
|
|
case 'C':
|
|
case 'S':
|
|
case '!':
|
|
case 'R':
|
|
case 'd':
|
|
/* Continue with signal sig. Csig;AA..AA
|
|
Step with signal sig. Ssig;AA..AA
|
|
Use the extended remote protocol. !
|
|
Restart the target system. R0
|
|
Toggle debug flag. d
|
|
Search backwards. tAA:PP,MM
|
|
Not supported: E04 */
|
|
gdb_cris_strcpy (remcomOutBuffer, error_message[E04]);
|
|
break;
|
|
|
|
default:
|
|
/* The stub should ignore other request and send an empty
|
|
response ($#<checksum>). This way we can extend the protocol and GDB
|
|
can tell whether the stub it is talking to uses the old or the new. */
|
|
remcomOutBuffer[0] = 0;
|
|
break;
|
|
}
|
|
putpacket(remcomOutBuffer);
|
|
}
|
|
}
|
|
|
|
/********************************** Breakpoint *******************************/
|
|
/* The hook for both a static (compiled) and a dynamic breakpoint set by GDB.
|
|
An internal stack is used by the stub. The register image of the caller is
|
|
stored in the structure register_image.
|
|
Interactive communication with the host is handled by handle_exception and
|
|
finally the register image is restored. */
|
|
|
|
void kgdb_handle_breakpoint(void);
|
|
|
|
asm ("\n"
|
|
" .global kgdb_handle_breakpoint\n"
|
|
"kgdb_handle_breakpoint:\n"
|
|
";;\n"
|
|
";; Response to the break-instruction\n"
|
|
";;\n"
|
|
";; Create a register image of the caller\n"
|
|
";;\n"
|
|
" move $dccr,[cris_reg+0x5E] ; Save the flags in DCCR before disable interrupts\n"
|
|
" di ; Disable interrupts\n"
|
|
" move.d $r0,[cris_reg] ; Save R0\n"
|
|
" move.d $r1,[cris_reg+0x04] ; Save R1\n"
|
|
" move.d $r2,[cris_reg+0x08] ; Save R2\n"
|
|
" move.d $r3,[cris_reg+0x0C] ; Save R3\n"
|
|
" move.d $r4,[cris_reg+0x10] ; Save R4\n"
|
|
" move.d $r5,[cris_reg+0x14] ; Save R5\n"
|
|
" move.d $r6,[cris_reg+0x18] ; Save R6\n"
|
|
" move.d $r7,[cris_reg+0x1C] ; Save R7\n"
|
|
" move.d $r8,[cris_reg+0x20] ; Save R8\n"
|
|
" move.d $r9,[cris_reg+0x24] ; Save R9\n"
|
|
" move.d $r10,[cris_reg+0x28] ; Save R10\n"
|
|
" move.d $r11,[cris_reg+0x2C] ; Save R11\n"
|
|
" move.d $r12,[cris_reg+0x30] ; Save R12\n"
|
|
" move.d $r13,[cris_reg+0x34] ; Save R13\n"
|
|
" move.d $sp,[cris_reg+0x38] ; Save SP (R14)\n"
|
|
";; Due to the old assembler-versions BRP might not be recognized\n"
|
|
" .word 0xE670 ; move brp,$r0\n"
|
|
" subq 2,$r0 ; Set to address of previous instruction.\n"
|
|
" move.d $r0,[cris_reg+0x3c] ; Save the address in PC (R15)\n"
|
|
" clear.b [cris_reg+0x40] ; Clear P0\n"
|
|
" move $vr,[cris_reg+0x41] ; Save special register P1\n"
|
|
" clear.w [cris_reg+0x42] ; Clear P4\n"
|
|
" move $ccr,[cris_reg+0x44] ; Save special register CCR\n"
|
|
" move $mof,[cris_reg+0x46] ; P7\n"
|
|
" clear.d [cris_reg+0x4A] ; Clear P8\n"
|
|
" move $ibr,[cris_reg+0x4E] ; P9,\n"
|
|
" move $irp,[cris_reg+0x52] ; P10,\n"
|
|
" move $srp,[cris_reg+0x56] ; P11,\n"
|
|
" move $dtp0,[cris_reg+0x5A] ; P12, register BAR, assembler might not know BAR\n"
|
|
" ; P13, register DCCR already saved\n"
|
|
";; Due to the old assembler-versions BRP might not be recognized\n"
|
|
" .word 0xE670 ; move brp,r0\n"
|
|
";; Static (compiled) breakpoints must return to the next instruction in order\n"
|
|
";; to avoid infinite loops. Dynamic (gdb-invoked) must restore the instruction\n"
|
|
";; in order to execute it when execution is continued.\n"
|
|
" test.b [is_dyn_brkp] ; Is this a dynamic breakpoint?\n"
|
|
" beq is_static ; No, a static breakpoint\n"
|
|
" nop\n"
|
|
" subq 2,$r0 ; rerun the instruction the break replaced\n"
|
|
"is_static:\n"
|
|
" moveq 1,$r1\n"
|
|
" move.b $r1,[is_dyn_brkp] ; Set the state variable to dynamic breakpoint\n"
|
|
" move.d $r0,[cris_reg+0x62] ; Save the return address in BRP\n"
|
|
" move $usp,[cris_reg+0x66] ; USP\n"
|
|
";;\n"
|
|
";; Handle the communication\n"
|
|
";;\n"
|
|
" move.d internal_stack+1020,$sp ; Use the internal stack which grows upward\n"
|
|
" moveq 5,$r10 ; SIGTRAP\n"
|
|
" jsr handle_exception ; Interactive routine\n"
|
|
";;\n"
|
|
";; Return to the caller\n"
|
|
";;\n"
|
|
" move.d [cris_reg],$r0 ; Restore R0\n"
|
|
" move.d [cris_reg+0x04],$r1 ; Restore R1\n"
|
|
" move.d [cris_reg+0x08],$r2 ; Restore R2\n"
|
|
" move.d [cris_reg+0x0C],$r3 ; Restore R3\n"
|
|
" move.d [cris_reg+0x10],$r4 ; Restore R4\n"
|
|
" move.d [cris_reg+0x14],$r5 ; Restore R5\n"
|
|
" move.d [cris_reg+0x18],$r6 ; Restore R6\n"
|
|
" move.d [cris_reg+0x1C],$r7 ; Restore R7\n"
|
|
" move.d [cris_reg+0x20],$r8 ; Restore R8\n"
|
|
" move.d [cris_reg+0x24],$r9 ; Restore R9\n"
|
|
" move.d [cris_reg+0x28],$r10 ; Restore R10\n"
|
|
" move.d [cris_reg+0x2C],$r11 ; Restore R11\n"
|
|
" move.d [cris_reg+0x30],$r12 ; Restore R12\n"
|
|
" move.d [cris_reg+0x34],$r13 ; Restore R13\n"
|
|
";;\n"
|
|
";; FIXME: Which registers should be restored?\n"
|
|
";;\n"
|
|
" move.d [cris_reg+0x38],$sp ; Restore SP (R14)\n"
|
|
" move [cris_reg+0x56],$srp ; Restore the subroutine return pointer.\n"
|
|
" move [cris_reg+0x5E],$dccr ; Restore DCCR\n"
|
|
" move [cris_reg+0x66],$usp ; Restore USP\n"
|
|
" jump [cris_reg+0x62] ; A jump to the content in register BRP works.\n"
|
|
" nop ;\n"
|
|
"\n");
|
|
|
|
/* The hook for an interrupt generated by GDB. An internal stack is used
|
|
by the stub. The register image of the caller is stored in the structure
|
|
register_image. Interactive communication with the host is handled by
|
|
handle_exception and finally the register image is restored. Due to the
|
|
old assembler which does not recognise the break instruction and the
|
|
breakpoint return pointer hex-code is used. */
|
|
|
|
void kgdb_handle_serial(void);
|
|
|
|
asm ("\n"
|
|
" .global kgdb_handle_serial\n"
|
|
"kgdb_handle_serial:\n"
|
|
";;\n"
|
|
";; Response to a serial interrupt\n"
|
|
";;\n"
|
|
"\n"
|
|
" move $dccr,[cris_reg+0x5E] ; Save the flags in DCCR\n"
|
|
" di ; Disable interrupts\n"
|
|
" move.d $r0,[cris_reg] ; Save R0\n"
|
|
" move.d $r1,[cris_reg+0x04] ; Save R1\n"
|
|
" move.d $r2,[cris_reg+0x08] ; Save R2\n"
|
|
" move.d $r3,[cris_reg+0x0C] ; Save R3\n"
|
|
" move.d $r4,[cris_reg+0x10] ; Save R4\n"
|
|
" move.d $r5,[cris_reg+0x14] ; Save R5\n"
|
|
" move.d $r6,[cris_reg+0x18] ; Save R6\n"
|
|
" move.d $r7,[cris_reg+0x1C] ; Save R7\n"
|
|
" move.d $r8,[cris_reg+0x20] ; Save R8\n"
|
|
" move.d $r9,[cris_reg+0x24] ; Save R9\n"
|
|
" move.d $r10,[cris_reg+0x28] ; Save R10\n"
|
|
" move.d $r11,[cris_reg+0x2C] ; Save R11\n"
|
|
" move.d $r12,[cris_reg+0x30] ; Save R12\n"
|
|
" move.d $r13,[cris_reg+0x34] ; Save R13\n"
|
|
" move.d $sp,[cris_reg+0x38] ; Save SP (R14)\n"
|
|
" move $irp,[cris_reg+0x3c] ; Save the address in PC (R15)\n"
|
|
" clear.b [cris_reg+0x40] ; Clear P0\n"
|
|
" move $vr,[cris_reg+0x41] ; Save special register P1,\n"
|
|
" clear.w [cris_reg+0x42] ; Clear P4\n"
|
|
" move $ccr,[cris_reg+0x44] ; Save special register CCR\n"
|
|
" move $mof,[cris_reg+0x46] ; P7\n"
|
|
" clear.d [cris_reg+0x4A] ; Clear P8\n"
|
|
" move $ibr,[cris_reg+0x4E] ; P9,\n"
|
|
" move $irp,[cris_reg+0x52] ; P10,\n"
|
|
" move $srp,[cris_reg+0x56] ; P11,\n"
|
|
" move $dtp0,[cris_reg+0x5A] ; P12, register BAR, assembler might not know BAR\n"
|
|
" ; P13, register DCCR already saved\n"
|
|
";; Due to the old assembler-versions BRP might not be recognized\n"
|
|
" .word 0xE670 ; move brp,r0\n"
|
|
" move.d $r0,[cris_reg+0x62] ; Save the return address in BRP\n"
|
|
" move $usp,[cris_reg+0x66] ; USP\n"
|
|
"\n"
|
|
";; get the serial character (from debugport.c) and check if it is a ctrl-c\n"
|
|
"\n"
|
|
" jsr getDebugChar\n"
|
|
" cmp.b 3, $r10\n"
|
|
" bne goback\n"
|
|
" nop\n"
|
|
"\n"
|
|
" move.d [cris_reg+0x5E], $r10 ; Get DCCR\n"
|
|
" btstq 8, $r10 ; Test the U-flag.\n"
|
|
" bmi goback\n"
|
|
" nop\n"
|
|
"\n"
|
|
";;\n"
|
|
";; Handle the communication\n"
|
|
";;\n"
|
|
" move.d internal_stack+1020,$sp ; Use the internal stack\n"
|
|
" moveq 2,$r10 ; SIGINT\n"
|
|
" jsr handle_exception ; Interactive routine\n"
|
|
"\n"
|
|
"goback:\n"
|
|
";;\n"
|
|
";; Return to the caller\n"
|
|
";;\n"
|
|
" move.d [cris_reg],$r0 ; Restore R0\n"
|
|
" move.d [cris_reg+0x04],$r1 ; Restore R1\n"
|
|
" move.d [cris_reg+0x08],$r2 ; Restore R2\n"
|
|
" move.d [cris_reg+0x0C],$r3 ; Restore R3\n"
|
|
" move.d [cris_reg+0x10],$r4 ; Restore R4\n"
|
|
" move.d [cris_reg+0x14],$r5 ; Restore R5\n"
|
|
" move.d [cris_reg+0x18],$r6 ; Restore R6\n"
|
|
" move.d [cris_reg+0x1C],$r7 ; Restore R7\n"
|
|
" move.d [cris_reg+0x20],$r8 ; Restore R8\n"
|
|
" move.d [cris_reg+0x24],$r9 ; Restore R9\n"
|
|
" move.d [cris_reg+0x28],$r10 ; Restore R10\n"
|
|
" move.d [cris_reg+0x2C],$r11 ; Restore R11\n"
|
|
" move.d [cris_reg+0x30],$r12 ; Restore R12\n"
|
|
" move.d [cris_reg+0x34],$r13 ; Restore R13\n"
|
|
";;\n"
|
|
";; FIXME: Which registers should be restored?\n"
|
|
";;\n"
|
|
" move.d [cris_reg+0x38],$sp ; Restore SP (R14)\n"
|
|
" move [cris_reg+0x56],$srp ; Restore the subroutine return pointer.\n"
|
|
" move [cris_reg+0x5E],$dccr ; Restore DCCR\n"
|
|
" move [cris_reg+0x66],$usp ; Restore USP\n"
|
|
" reti ; Return from the interrupt routine\n"
|
|
" nop\n"
|
|
"\n");
|
|
|
|
/* Use this static breakpoint in the start-up only. */
|
|
|
|
void
|
|
breakpoint(void)
|
|
{
|
|
kgdb_started = 1;
|
|
is_dyn_brkp = 0; /* This is a static, not a dynamic breakpoint. */
|
|
__asm__ volatile ("break 8"); /* Jump to handle_breakpoint. */
|
|
}
|
|
|
|
/* initialize kgdb. doesn't break into the debugger, but sets up irq and ports */
|
|
|
|
void
|
|
kgdb_init(void)
|
|
{
|
|
/* could initialize debug port as well but it's done in head.S already... */
|
|
|
|
/* breakpoint handler is now set in irq.c */
|
|
set_int_vector(8, kgdb_handle_serial);
|
|
|
|
enableDebugIRQ();
|
|
}
|
|
|
|
/****************************** End of file **********************************/
|