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

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/*
* The ARM LDRD and Thumb LDRSB instructions use bit 20/11 (ARM/Thumb)
* differently than every other instruction, so it is set to 0 (write)
* even though the instructions are read instructions. This means that
* during an abort the instructions will be treated as a write and the
* handler will raise a signal from unwriteable locations if they
* fault. We have to specifically check for these instructions
* from the abort handlers to treat them properly.
*
*/
ARM: entry: abort-macro: specify registers to be used for macros Require all callers of abort macros to specify the registers to be used. This improves the documentation at the callsites as to which registers are being used by this assembly code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 12:42:01 +00:00
.macro do_thumb_abort, fsr, pc, psr, tmp
tst \psr, #PSR_T_BIT
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
beq not_thumb
ARM: entry: abort-macro: specify registers to be used for macros Require all callers of abort macros to specify the registers to be used. This improves the documentation at the callsites as to which registers are being used by this assembly code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 12:42:01 +00:00
ldrh \tmp, [\pc] @ Read aborted Thumb instruction
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 09:32:02 +00:00
uaccess_disable ip @ disable userspace access
ARM: entry: abort-macro: specify registers to be used for macros Require all callers of abort macros to specify the registers to be used. This improves the documentation at the callsites as to which registers are being used by this assembly code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 12:42:01 +00:00
and \tmp, \tmp, # 0xfe00 @ Mask opcode field
cmp \tmp, # 0x5600 @ Is it ldrsb?
orreq \tmp, \tmp, #1 << 11 @ Set L-bit if yes
tst \tmp, #1 << 11 @ L = 0 -> write
ARM: 7088/1: entry: fix wrong parameter name used in do_thumb_abort Commit be020f8618ca, "ARM: entry: abort-macro: specify registers to be used for macros", while replacing register numbers with macro parameter names, mismatched the name used for r1. For me, this resulted in user space built for EABI with -march=armv4t -mtune=arm920t -mthumb-interwork -mthumb broken on my OMAP1510 based Amstrad Delta (old ABI and no thumb still worked for me though). Fix this by using correct parameter name fsr instead of mismatched psr, used by callers for another purpose. Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-09-08 17:45:40 +00:00
orreq \fsr, \fsr, #1 << 11 @ yes.
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 15:01:26 +00:00
b do_DataAbort
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
not_thumb:
.endm
/*
ARM: entry: abort-macro: specify registers to be used for macros Require all callers of abort macros to specify the registers to be used. This improves the documentation at the callsites as to which registers are being used by this assembly code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 12:42:01 +00:00
* We check for the following instruction encoding for LDRD.
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
*
ARM: entry: abort-macro: specify registers to be used for macros Require all callers of abort macros to specify the registers to be used. This improves the documentation at the callsites as to which registers are being used by this assembly code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-06-26 12:42:01 +00:00
* [27:25] == 000
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
* [7:4] == 1101
* [20] == 0
*/
ARM: mm: improve do_ldrd_abort macro Improve the do_ldrd_abort macro code - firstly, it inefficiently checks for the LDRD encoding by doing a multi-stage test of various bits. This can be simplified by generating a mask, bitmasking the instruction and then comparing the result. Secondly, we want to be able to test the result rather than branching to do_DataAbort, so remove the branch at the end and rename the macro to 'teq_ldrd' to reflect it's new usage. teq_ldrd macro returns 'eq' if the instruction was a LDRD. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-08-25 13:59:15 +00:00
.macro teq_ldrd, tmp, insn
mov \tmp, #0x0e100000
orr \tmp, #0x000000f0
and \tmp, \insn, \tmp
teq \tmp, #0x000000d0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.endm
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