2005-04-17 06:20:36 +08:00
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 1999, 2000 by Ralf Baechle and others.
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2006-02-08 21:38:18 +08:00
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* Copyright (C) 2005, 2006 by Ralf Baechle (ralf@linux-mips.org)
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2005-04-17 06:20:36 +08:00
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2004 Thiemo Seufer
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/mman.h>
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#include <linux/personality.h>
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#include <linux/sys.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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2006-02-08 00:48:03 +08:00
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#include <linux/kallsyms.h>
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2005-04-17 06:20:36 +08:00
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2005-05-31 19:49:19 +08:00
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#include <asm/abi.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/bootinfo.h>
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#include <asm/cpu.h>
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2005-05-31 19:49:19 +08:00
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#include <asm/dsp.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/fpu.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/mipsregs.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/elf.h>
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#include <asm/isadep.h>
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#include <asm/inst.h>
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2006-09-26 22:44:01 +08:00
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#include <asm/stacktrace.h>
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2006-04-05 16:45:45 +08:00
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#ifdef CONFIG_MIPS_MT_SMTC
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#include <asm/mipsmtregs.h>
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extern void smtc_idle_loop_hook(void);
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#endif /* CONFIG_MIPS_MT_SMTC */
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2005-04-17 06:20:36 +08:00
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/*
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* The idle thread. There's no useful work to be done, so just try to conserve
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* power and have a low exit latency (ie sit in a loop waiting for somebody to
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* say that they'd like to reschedule)
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*/
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ATTRIB_NORET void cpu_idle(void)
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{
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/* endless idle loop with no priority at all */
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while (1) {
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2006-04-05 16:45:45 +08:00
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while (!need_resched()) {
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#ifdef CONFIG_MIPS_MT_SMTC
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smtc_idle_loop_hook();
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#endif /* CONFIG_MIPS_MT_SMTC */
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2005-04-17 06:20:36 +08:00
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if (cpu_wait)
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(*cpu_wait)();
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2006-04-05 16:45:45 +08:00
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}
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2005-11-09 13:39:01 +08:00
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preempt_enable_no_resched();
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2005-04-17 06:20:36 +08:00
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schedule();
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2005-11-09 13:39:01 +08:00
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preempt_disable();
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2005-04-17 06:20:36 +08:00
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}
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}
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2005-05-31 19:49:19 +08:00
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/*
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* Native o32 and N64 ABI without DSP ASE
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*/
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struct mips_abi mips_abi = {
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.do_signal = do_signal,
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#ifdef CONFIG_TRAD_SIGNALS
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.setup_frame = setup_frame,
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#endif
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.setup_rt_frame = setup_rt_frame
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};
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#ifdef CONFIG_MIPS32_O32
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/*
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* o32 compatibility on 64-bit kernels, without DSP ASE
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*/
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struct mips_abi mips_abi_32 = {
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.do_signal = do_signal32,
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.setup_frame = setup_frame_32,
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.setup_rt_frame = setup_rt_frame_32
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};
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#endif /* CONFIG_MIPS32_O32 */
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#ifdef CONFIG_MIPS32_N32
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/*
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* N32 on 64-bit kernels, without DSP ASE
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*/
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struct mips_abi mips_abi_n32 = {
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.do_signal = do_signal,
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.setup_rt_frame = setup_rt_frame_n32
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};
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#endif /* CONFIG_MIPS32_N32 */
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2005-04-17 06:20:36 +08:00
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asmlinkage void ret_from_fork(void);
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void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
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{
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unsigned long status;
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/* New thread loses kernel privileges. */
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status = regs->cp0_status & ~(ST0_CU0|ST0_CU1|KU_MASK);
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2005-09-04 06:56:16 +08:00
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#ifdef CONFIG_64BIT
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2005-04-17 06:20:36 +08:00
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status &= ~ST0_FR;
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status |= (current->thread.mflags & MF_32BIT_REGS) ? 0 : ST0_FR;
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#endif
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status |= KU_USER;
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regs->cp0_status = status;
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clear_used_math();
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2006-10-08 23:10:01 +08:00
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clear_fpu_owner();
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2005-05-31 19:49:19 +08:00
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if (cpu_has_dsp)
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__init_dsp();
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2005-04-17 06:20:36 +08:00
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regs->cp0_epc = pc;
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regs->regs[29] = sp;
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current_thread_info()->addr_limit = USER_DS;
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}
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void exit_thread(void)
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{
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}
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void flush_thread(void)
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{
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}
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int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
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unsigned long unused, struct task_struct *p, struct pt_regs *regs)
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{
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2006-01-12 17:06:08 +08:00
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struct thread_info *ti = task_thread_info(p);
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2005-04-17 06:20:36 +08:00
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struct pt_regs *childregs;
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long childksp;
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2005-04-14 01:43:59 +08:00
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p->set_child_tid = p->clear_child_tid = NULL;
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2005-04-17 06:20:36 +08:00
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2006-01-12 17:06:08 +08:00
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childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE - 32;
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2005-04-17 06:20:36 +08:00
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preempt_disable();
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2005-05-31 19:49:19 +08:00
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if (is_fpu_owner())
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2005-04-17 06:20:36 +08:00
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save_fp(p);
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2005-05-31 19:49:19 +08:00
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if (cpu_has_dsp)
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save_dsp(p);
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2005-04-17 06:20:36 +08:00
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preempt_enable();
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/* set up new TSS. */
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childregs = (struct pt_regs *) childksp - 1;
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*childregs = *regs;
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childregs->regs[7] = 0; /* Clear error flag */
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#if defined(CONFIG_BINFMT_IRIX)
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if (current->personality != PER_LINUX) {
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/* Under IRIX things are a little different. */
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childregs->regs[3] = 1;
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regs->regs[3] = 0;
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}
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#endif
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childregs->regs[2] = 0; /* Child gets zero as return value */
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regs->regs[2] = p->pid;
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if (childregs->cp0_status & ST0_CU0) {
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childregs->regs[28] = (unsigned long) ti;
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childregs->regs[29] = childksp;
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ti->addr_limit = KERNEL_DS;
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} else {
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childregs->regs[29] = usp;
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ti->addr_limit = USER_DS;
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}
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p->thread.reg29 = (unsigned long) childregs;
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p->thread.reg31 = (unsigned long) ret_from_fork;
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/*
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* New tasks lose permission to use the fpu. This accelerates context
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* switching for most programs since they don't use the fpu.
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*/
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p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
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childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
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clear_tsk_thread_flag(p, TIF_USEDFPU);
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2006-04-05 16:45:47 +08:00
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#ifdef CONFIG_MIPS_MT_FPAFF
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/*
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* FPU affinity support is cleaner if we track the
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* user-visible CPU affinity from the very beginning.
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* The generic cpus_allowed mask will already have
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* been copied from the parent before copy_thread
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* is invoked.
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*/
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p->thread.user_cpus_allowed = p->cpus_allowed;
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#endif /* CONFIG_MIPS_MT_FPAFF */
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2005-04-14 01:43:59 +08:00
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if (clone_flags & CLONE_SETTLS)
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ti->tp_value = regs->regs[7];
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2005-04-17 06:20:36 +08:00
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return 0;
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}
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/* Fill in the fpu structure for a core dump.. */
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
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{
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memcpy(r, ¤t->thread.fpu, sizeof(current->thread.fpu));
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return 1;
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}
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2005-12-17 06:40:47 +08:00
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void elf_dump_regs(elf_greg_t *gp, struct pt_regs *regs)
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2005-04-17 06:20:36 +08:00
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{
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int i;
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for (i = 0; i < EF_R0; i++)
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gp[i] = 0;
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gp[EF_R0] = 0;
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for (i = 1; i <= 31; i++)
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gp[EF_R0 + i] = regs->regs[i];
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gp[EF_R26] = 0;
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gp[EF_R27] = 0;
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gp[EF_LO] = regs->lo;
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gp[EF_HI] = regs->hi;
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gp[EF_CP0_EPC] = regs->cp0_epc;
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gp[EF_CP0_BADVADDR] = regs->cp0_badvaddr;
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gp[EF_CP0_STATUS] = regs->cp0_status;
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gp[EF_CP0_CAUSE] = regs->cp0_cause;
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#ifdef EF_UNUSED0
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gp[EF_UNUSED0] = 0;
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#endif
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}
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2005-03-14 18:16:59 +08:00
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int dump_task_regs (struct task_struct *tsk, elf_gregset_t *regs)
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{
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2006-01-12 17:06:07 +08:00
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elf_dump_regs(*regs, task_pt_regs(tsk));
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2005-03-14 18:16:59 +08:00
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return 1;
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}
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2005-04-17 06:20:36 +08:00
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int dump_task_fpu (struct task_struct *t, elf_fpregset_t *fpr)
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{
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memcpy(fpr, &t->thread.fpu, sizeof(current->thread.fpu));
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return 1;
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}
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/*
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* Create a kernel thread
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*/
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ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
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{
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do_exit(fn(arg));
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}
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long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
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{
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struct pt_regs regs;
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memset(®s, 0, sizeof(regs));
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regs.regs[4] = (unsigned long) arg;
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regs.regs[5] = (unsigned long) fn;
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regs.cp0_epc = (unsigned long) kernel_thread_helper;
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regs.cp0_status = read_c0_status();
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#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
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regs.cp0_status &= ~(ST0_KUP | ST0_IEC);
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regs.cp0_status |= ST0_IEP;
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#else
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regs.cp0_status |= ST0_EXL;
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#endif
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/* Ok, create the new process.. */
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return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
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}
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2006-08-18 22:18:09 +08:00
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/*
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*
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*/
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struct mips_frame_info {
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void *func;
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unsigned long func_size;
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int frame_size;
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int pc_offset;
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};
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2005-02-21 18:55:16 +08:00
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2006-08-03 15:29:15 +08:00
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static inline int is_ra_save_ins(union mips_instruction *ip)
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{
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/* sw / sd $ra, offset($sp) */
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return (ip->i_format.opcode == sw_op || ip->i_format.opcode == sd_op) &&
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ip->i_format.rs == 29 &&
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ip->i_format.rt == 31;
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}
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static inline int is_jal_jalr_jr_ins(union mips_instruction *ip)
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{
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if (ip->j_format.opcode == jal_op)
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return 1;
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if (ip->r_format.opcode != spec_op)
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return 0;
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return ip->r_format.func == jalr_op || ip->r_format.func == jr_op;
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}
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static inline int is_sp_move_ins(union mips_instruction *ip)
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{
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/* addiu/daddiu sp,sp,-imm */
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if (ip->i_format.rs != 29 || ip->i_format.rt != 29)
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return 0;
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if (ip->i_format.opcode == addiu_op || ip->i_format.opcode == daddiu_op)
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return 1;
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return 0;
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}
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|
2006-07-29 22:27:20 +08:00
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static int get_frame_info(struct mips_frame_info *info)
|
2005-04-17 06:20:36 +08:00
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{
|
2006-08-03 15:29:15 +08:00
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union mips_instruction *ip = info->func;
|
2006-08-18 22:18:08 +08:00
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unsigned max_insns = info->func_size / sizeof(union mips_instruction);
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unsigned i;
|
2006-08-03 15:29:15 +08:00
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2005-04-17 06:20:36 +08:00
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info->pc_offset = -1;
|
2006-02-08 00:48:03 +08:00
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info->frame_size = 0;
|
2005-04-17 06:20:36 +08:00
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2006-08-18 22:18:08 +08:00
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if (!ip)
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goto err;
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if (max_insns == 0)
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max_insns = 128U; /* unknown function size */
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max_insns = min(128U, max_insns);
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|
|
2006-08-03 15:29:15 +08:00
|
|
|
for (i = 0; i < max_insns; i++, ip++) {
|
|
|
|
|
|
|
|
if (is_jal_jalr_jr_ins(ip))
|
2006-02-08 00:48:03 +08:00
|
|
|
break;
|
2006-08-03 15:29:20 +08:00
|
|
|
if (!info->frame_size) {
|
|
|
|
if (is_sp_move_ins(ip))
|
|
|
|
info->frame_size = - ip->i_format.simmediate;
|
|
|
|
continue;
|
2006-02-08 00:48:03 +08:00
|
|
|
}
|
2006-08-03 15:29:20 +08:00
|
|
|
if (info->pc_offset == -1 && is_ra_save_ins(ip)) {
|
2006-02-08 00:48:03 +08:00
|
|
|
info->pc_offset =
|
|
|
|
ip->i_format.simmediate / sizeof(long);
|
2006-08-03 15:29:20 +08:00
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
2006-07-29 22:27:20 +08:00
|
|
|
if (info->frame_size && info->pc_offset >= 0) /* nested */
|
|
|
|
return 0;
|
|
|
|
if (info->pc_offset < 0) /* leaf */
|
|
|
|
return 1;
|
|
|
|
/* prologue seems boggus... */
|
2006-08-18 22:18:08 +08:00
|
|
|
err:
|
2006-07-29 22:27:20 +08:00
|
|
|
return -1;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2006-08-18 22:18:09 +08:00
|
|
|
static struct mips_frame_info schedule_mfi __read_mostly;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int __init frame_info_init(void)
|
|
|
|
{
|
2006-08-18 22:18:09 +08:00
|
|
|
unsigned long size = 0;
|
2006-02-08 00:48:03 +08:00
|
|
|
#ifdef CONFIG_KALLSYMS
|
2006-08-18 22:18:09 +08:00
|
|
|
unsigned long ofs;
|
|
|
|
|
2006-10-13 19:37:35 +08:00
|
|
|
kallsyms_lookup_size_offset((unsigned long)schedule, &size, &ofs);
|
2006-02-08 00:48:03 +08:00
|
|
|
#endif
|
2006-08-18 22:18:09 +08:00
|
|
|
schedule_mfi.func = schedule;
|
|
|
|
schedule_mfi.func_size = size;
|
|
|
|
|
|
|
|
get_frame_info(&schedule_mfi);
|
2006-08-03 15:29:18 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Without schedule() frame info, result given by
|
|
|
|
* thread_saved_pc() and get_wchan() are not reliable.
|
|
|
|
*/
|
2006-08-18 22:18:09 +08:00
|
|
|
if (schedule_mfi.pc_offset < 0)
|
2006-08-03 15:29:18 +08:00
|
|
|
printk("Can't analyze schedule() prologue at %p\n", schedule);
|
2006-02-08 00:48:03 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
arch_initcall(frame_info_init);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return saved PC of a blocked thread.
|
|
|
|
*/
|
|
|
|
unsigned long thread_saved_pc(struct task_struct *tsk)
|
|
|
|
{
|
|
|
|
struct thread_struct *t = &tsk->thread;
|
|
|
|
|
|
|
|
/* New born processes are a special case */
|
|
|
|
if (t->reg31 == (unsigned long) ret_from_fork)
|
|
|
|
return t->reg31;
|
2006-08-18 22:18:09 +08:00
|
|
|
if (schedule_mfi.pc_offset < 0)
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
2006-08-18 22:18:09 +08:00
|
|
|
return ((unsigned long *)t->reg29)[schedule_mfi.pc_offset];
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2006-07-29 22:27:20 +08:00
|
|
|
#ifdef CONFIG_KALLSYMS
|
2006-08-03 15:29:21 +08:00
|
|
|
/* used by show_backtrace() */
|
|
|
|
unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
|
2006-09-29 17:02:51 +08:00
|
|
|
unsigned long pc, unsigned long *ra)
|
2006-07-29 22:27:20 +08:00
|
|
|
{
|
|
|
|
unsigned long stack_page;
|
|
|
|
struct mips_frame_info info;
|
|
|
|
unsigned long size, ofs;
|
2006-08-03 15:29:21 +08:00
|
|
|
int leaf;
|
2006-09-29 17:02:51 +08:00
|
|
|
extern void ret_from_irq(void);
|
|
|
|
extern void ret_from_exception(void);
|
2006-07-29 22:27:20 +08:00
|
|
|
|
|
|
|
stack_page = (unsigned long)task_stack_page(task);
|
|
|
|
if (!stack_page)
|
|
|
|
return 0;
|
|
|
|
|
2006-09-29 17:02:51 +08:00
|
|
|
/*
|
|
|
|
* If we reached the bottom of interrupt context,
|
|
|
|
* return saved pc in pt_regs.
|
|
|
|
*/
|
|
|
|
if (pc == (unsigned long)ret_from_irq ||
|
|
|
|
pc == (unsigned long)ret_from_exception) {
|
|
|
|
struct pt_regs *regs;
|
|
|
|
if (*sp >= stack_page &&
|
|
|
|
*sp + sizeof(*regs) <= stack_page + THREAD_SIZE - 32) {
|
|
|
|
regs = (struct pt_regs *)*sp;
|
|
|
|
pc = regs->cp0_epc;
|
|
|
|
if (__kernel_text_address(pc)) {
|
|
|
|
*sp = regs->regs[29];
|
|
|
|
*ra = regs->regs[31];
|
|
|
|
return pc;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2006-10-13 19:37:35 +08:00
|
|
|
if (!kallsyms_lookup_size_offset(pc, &size, &ofs))
|
2006-07-29 22:27:20 +08:00
|
|
|
return 0;
|
2006-08-18 22:18:07 +08:00
|
|
|
/*
|
|
|
|
* Return ra if an exception occured at the first instruction
|
|
|
|
*/
|
2006-09-29 17:02:51 +08:00
|
|
|
if (unlikely(ofs == 0)) {
|
|
|
|
pc = *ra;
|
|
|
|
*ra = 0;
|
|
|
|
return pc;
|
|
|
|
}
|
2006-07-29 22:27:20 +08:00
|
|
|
|
|
|
|
info.func = (void *)(pc - ofs);
|
|
|
|
info.func_size = ofs; /* analyze from start to ofs */
|
2006-08-03 15:29:21 +08:00
|
|
|
leaf = get_frame_info(&info);
|
|
|
|
if (leaf < 0)
|
2006-07-29 22:27:20 +08:00
|
|
|
return 0;
|
2006-08-03 15:29:21 +08:00
|
|
|
|
|
|
|
if (*sp < stack_page ||
|
|
|
|
*sp + info.frame_size > stack_page + THREAD_SIZE - 32)
|
2006-07-29 22:27:20 +08:00
|
|
|
return 0;
|
|
|
|
|
2006-08-03 15:29:21 +08:00
|
|
|
if (leaf)
|
|
|
|
/*
|
|
|
|
* For some extreme cases, get_frame_info() can
|
|
|
|
* consider wrongly a nested function as a leaf
|
|
|
|
* one. In that cases avoid to return always the
|
|
|
|
* same value.
|
|
|
|
*/
|
2006-09-29 17:02:51 +08:00
|
|
|
pc = pc != *ra ? *ra : 0;
|
2006-08-03 15:29:21 +08:00
|
|
|
else
|
|
|
|
pc = ((unsigned long *)(*sp))[info.pc_offset];
|
|
|
|
|
|
|
|
*sp += info.frame_size;
|
2006-09-29 17:02:51 +08:00
|
|
|
*ra = 0;
|
2006-08-03 15:29:21 +08:00
|
|
|
return __kernel_text_address(pc) ? pc : 0;
|
2006-07-29 22:27:20 +08:00
|
|
|
}
|
|
|
|
#endif
|
2006-08-18 22:18:09 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* get_wchan - a maintenance nightmare^W^Wpain in the ass ...
|
|
|
|
*/
|
|
|
|
unsigned long get_wchan(struct task_struct *task)
|
|
|
|
{
|
|
|
|
unsigned long pc = 0;
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
|
|
unsigned long sp;
|
2006-09-29 17:02:51 +08:00
|
|
|
unsigned long ra = 0;
|
2006-08-18 22:18:09 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
if (!task || task == current || task->state == TASK_RUNNING)
|
|
|
|
goto out;
|
|
|
|
if (!task_stack_page(task))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
pc = thread_saved_pc(task);
|
|
|
|
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
|
|
sp = task->thread.reg29 + schedule_mfi.frame_size;
|
|
|
|
|
|
|
|
while (in_sched_functions(pc))
|
2006-09-29 17:02:51 +08:00
|
|
|
pc = unwind_stack(task, &sp, pc, &ra);
|
2006-08-18 22:18:09 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
out:
|
|
|
|
return pc;
|
|
|
|
}
|