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ARM64: perf: support dwarf unwinding in compat mode

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Add support for unwinding using the dwarf information in compat
mode. Using the correct user stack pointer allows perf to record
the frames correctly in the native and compat modes.

Note that although the dwarf frame unwinding works ok using
libunwind in native mode (on ARMv7 & ARMv8), some changes are
required to the libunwind code for the compat mode. Those changes
are posted separately on the libunwind mailing list.

Tested on ARMv8 platform with v8 and compat v7 binaries, the latter
are statically built.

Signed-off-by: Jean Pihet <jean.pihet@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Jean Pihet 2014-02-03 19:18:29 +01:00 committed by Catalin Marinas
parent 23c7d70d55
commit 5f888a1d33
2 changed files with 2 additions and 2 deletions
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2
arch/arm64/include/asm/compat.h
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@ -228,7 +228,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)uptr;
}
#define compat_user_stack_pointer() (current_pt_regs()->compat_sp)
#define compat_user_stack_pointer() (user_stack_pointer(current_pt_regs()))
static inline void __user *arch_compat_alloc_user_space(long len)
{

2
arch/arm64/include/asm/ptrace.h
View file

@ -133,7 +133,7 @@ struct pt_regs {
(!((regs)->pstate & PSR_F_BIT))
#define user_stack_pointer(regs) \
((regs)->sp)
(!compat_user_mode(regs)) ? ((regs)->sp) : ((regs)->compat_sp)
/*
* Are the current registers suitable for user mode? (used to maintain