diff options
| author | Scott Williams <scwilliams@nvidia.com> | 2011-08-03 22:18:31 -0700 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2013-09-14 00:56:02 -0700 |
| commit | 6aba0be8e5e6867c672c45e62460ac27f14fdc25 (patch) | |
| tree | c4418208550ee51ba8e423ec716d9c6fc4fd1671 /arch/arm/mach-tegra/sleep.h | |
| parent | 2d399f70e2d0a3df932270ee6bb3c07e3fa12d9c (diff) | |
ARM: tegra: power: Add stack frame debug checks
Tag the stack frame created by the CPU register context push
macro with a magic number and validate that magic number in
the register context pop macro to ensure that the stack
remains balanced and uncorrupted.
Change-Id: I6aa876496e30e6e70c0c60800c1b35d217595153
Signed-off-by: Scott Williams <scwilliams@nvidia.com>
Rebase-Id: R78eba17c256f03bdd6457ca3ebb1ecdba5632e60
Diffstat (limited to 'arch/arm/mach-tegra/sleep.h')
| -rw-r--r-- | arch/arm/mach-tegra/sleep.h | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h index f919e9668978..cba062e9c723 100644 --- a/arch/arm/mach-tegra/sleep.h +++ b/arch/arm/mach-tegra/sleep.h @@ -107,7 +107,28 @@ dsb .endm -.macro push_ctx_regs +#define DEBUG_CONTEXT_STACK 0 + +/* pops a debug check token from the stack */ +.macro pop_stack_token tmp1, tmp2 +#if DEBUG_CONTEXT_STACK + mov32 \tmp1, 0xBAB1F00D + ldmfd sp!, {\tmp2} + cmp \tmp1, \tmp2 + movne pc, #0 +#endif +.endm + +/* pushes a debug check token onto the stack */ +.macro push_stack_token tmp1 +#if DEBUG_CONTEXT_STACK + mov32 \tmp1, 0xBAB1F00D + stmfd sp!, {\tmp1} +#endif +.endm + +.macro push_ctx_regs, tmp1 + push_stack_token \tmp1 @ debug check word stmfd sp!, {r4 - r11, lr} /* FIXME: The next two instructions should be removed if our change to save the diagnostic regsiter in the CPU context is accepted. */ @@ -115,12 +136,13 @@ stmfd sp!, {r4} .endm -.macro pop_ctx_regs +.macro pop_ctx_regs, tmp1, tmp2 /* FIXME: The next two instructions should be removed if our change to save the diagnostic regsiter in the CPU context is accepted. */ ldmfd sp!, {r4} mcr p15, 0, r4, c15, c0, 1 @ write diagnostic register ldmfd sp!, {r4 - r11, lr} + pop_stack_token \tmp1, \tmp2 @ debug stack debug token .endm #else |