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linux/arch/arm/mm/abort-ev7.S

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[ARM] armv7: add support for ARMv7 cores. This patch adds support for the ARMv7 cores. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-09 05:27:46 +08:00
#include <linux/linkage.h>
#include <asm/assembler.h>
/*
* Function: v7_early_abort
*
ARM: entry: data abort: tail-call the main data abort handler Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 23:01:26 +08:00
* Params : r2 = pt_regs
* : r4 = aborted context pc
ARM: entry: data abort: arrange for CPU abort helpers to take pc/psr in r4/r5 Re-jig the CPU abort helpers to take the PC/PSR in r4/r5 rather than r2/r3. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 21:35:07 +08:00
* : r5 = aborted context psr
[ARM] armv7: add support for ARMv7 cores. This patch adds support for the ARMv7 cores. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-09 05:27:46 +08:00
*
ARM: entry: data abort: tail-call the main data abort handler Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 23:01:26 +08:00
* Returns : r4 - r11, r13 preserved
[ARM] armv7: add support for ARMv7 cores. This patch adds support for the ARMv7 cores. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-09 05:27:46 +08:00
*
* Purpose : obtain information about current aborted instruction.
*/
.align 5
ENTRY(v7_early_abort)
mrc p15, 0, r1, c5, c0, 0 @ get FSR
mrc p15, 0, r0, c6, c0, 0 @ get FAR
ARM: entry: provide uaccess assembly macro hooks Provide hooks into the kernel entry and exit paths to permit control of userspace visibility to the kernel. The intended use is: - on entry to kernel from user, uaccess_disable will be called to disable userspace visibility - on exit from kernel to user, uaccess_enable will be called to enable userspace visibility - on entry from a kernel exception, uaccess_save_and_disable will be called to save the current userspace visibility setting, and disable access - on exit from a kernel exception, uaccess_restore will be called to restore the userspace visibility as it was before the exception occurred. These hooks allows us to keep userspace visibility disabled for the vast majority of the kernel, except for localised regions where we want to explicitly access userspace. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-08-20 17:32:02 +08:00
uaccess_disable ip @ disable userspace access
[ARM] armv7: add support for ARMv7 cores. This patch adds support for the ARMv7 cores. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-09 05:27:46 +08:00
/*
* V6 code adjusts the returned DFSR.
* New designs should not need to patch up faults.
*/
arm: mm: qsd8x50: Fix incorrect permission faults Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
2009-08-12 05:58:49 +08:00
#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
/*
* Detect erroneous permission failures and fix
*/
ldr r3, =0x40d @ On permission fault
and r3, r1, r3
cmp r3, #0x0d
ARM: entry: data abort: tail-call the main data abort handler Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 23:01:26 +08:00
bne do_DataAbort
arm: mm: qsd8x50: Fix incorrect permission faults Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
2009-08-12 05:58:49 +08:00
mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
isb
ARM: entry: data abort: avoid using r2 in abort helpers This allows us to pass the pt_regs pointer in to these functions ready for tail-calling the abort handler. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 21:42:02 +08:00
mrc p15, 0, ip, c7, c4, 0 @ Read the PAR
and r3, ip, #0x7b @ On translation fault
arm: mm: qsd8x50: Fix incorrect permission faults Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
2009-08-12 05:58:49 +08:00
cmp r3, #0x0b
ARM: entry: data abort: tail-call the main data abort handler Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 23:01:26 +08:00
bne do_DataAbort
arm: mm: qsd8x50: Fix incorrect permission faults Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
2009-08-12 05:58:49 +08:00
bic r1, r1, #0xf @ Fix up FSR FS[5:0]
ARM: entry: data abort: avoid using r2 in abort helpers This allows us to pass the pt_regs pointer in to these functions ready for tail-calling the abort handler. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 21:42:02 +08:00
and ip, ip, #0x7e
orr r1, r1, ip, LSR #1
arm: mm: qsd8x50: Fix incorrect permission faults Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
2009-08-12 05:58:49 +08:00
#endif
ARM: entry: data abort: tail-call the main data abort handler Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 23:01:26 +08:00
b do_DataAbort
[ARM] 5227/1: Add the ENDPROC declarations to the .S files This declaration specifies the "function" type and size for various assembly functions, mainly needed for generating the correct branch instructions in Thumb-2. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-28 18:22:32 +08:00
ENDPROC(v7_early_abort)