Commit 5f888a1d authored by Jean Pihet's avatar Jean Pihet Committed by Catalin Marinas

ARM64: perf: support dwarf unwinding in compat mode

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: default avatarJean Pihet <jean.pihet@linaro.org>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 23c7d70d
...@@ -228,7 +228,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr) ...@@ -228,7 +228,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)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) static inline void __user *arch_compat_alloc_user_space(long len)
{ {
......
...@@ -133,7 +133,7 @@ struct pt_regs { ...@@ -133,7 +133,7 @@ struct pt_regs {
(!((regs)->pstate & PSR_F_BIT)) (!((regs)->pstate & PSR_F_BIT))
#define user_stack_pointer(regs) \ #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 * Are the current registers suitable for user mode? (used to maintain
......
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