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Implement a cheaper getcontext()

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Since the fast unwinding code path doesn't need the full context,
a faster target dependent getcontext is implemented.

Signed-off-by: Lassi Tuura <lat@cern.ch>
This commit is contained in:
Arun Sharma 2011-04-05 21:26:56 -07:00
parent 15f182828d
commit e2962af9d3
10 changed files with 39 additions and 1 deletions
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1
include/tdep-arm/libunwind_i.h
View file

@ -215,6 +215,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#endif /* !UNW_LOCAL_ONLY */
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-hppa/libunwind_i.h
View file

@ -221,6 +221,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#endif /* !UNW_LOCAL_ONLY */
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-ia64/libunwind_i.h
View file

@ -216,6 +216,7 @@ struct ia64_global_unwind_state
# endif
};
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization unw.needs_initialization
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-mips/libunwind_i.h
View file

@ -276,6 +276,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#endif /* !UNW_LOCAL_ONLY */
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-ppc32/libunwind_i.h
View file

@ -251,6 +251,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
1, c->as_arg);
}
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-ppc64/libunwind_i.h
View file

@ -251,6 +251,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
1, c->as_arg);
}
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

1
include/tdep-x86/libunwind_i.h
View file

@ -237,6 +237,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#endif /* !UNW_LOCAL_ONLY */
#define tdep_getcontext_trace unw_getcontext
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define

2
include/tdep-x86_64/libunwind_i.h
View file

@ -177,6 +177,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
1, c->as_arg);
}
#define tdep_getcontext_trace UNW_ARCH_OBJ(getcontext_trace)
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init_mem_validate UNW_OBJ(init_mem_validate)
#define tdep_init UNW_OBJ(init)
@ -244,6 +245,7 @@ extern void tdep_stash_frame (struct dwarf_cursor *c,
struct dwarf_reg_state *rs);
#endif
extern int tdep_getcontext_trace (unw_tdep_context_t *);
extern int tdep_trace (unw_cursor_t *cursor, void **addresses, int *n);
#endif /* X86_64_LIBUNWIND_I_H */

2
src/mi/backtrace.c
View file

@ -61,7 +61,7 @@ unw_backtrace (void **buffer, int size)
unw_context_t uc;
int n = size;
unw_getcontext (&uc);
tdep_getcontext_trace (&uc);
if (unw_init_local (&cursor, &uc) < 0)
return 0;

29
src/x86_64/getcontext.S
View file

@ -101,5 +101,34 @@ _Ux86_64_getcontext:
.cfi_endproc
.size _Ux86_64_getcontext, . - _Ux86_64_getcontext
/* int _Ux86_64_getcontext_trace (ucontext_t *ucp)
Saves limited machine context in UCP necessary for libunwind.
Unlike _Ux86_64_getcontext, saves only the parts needed for
fast trace. If fast trace fails, caller will have to get the
full context.
*/
.global _Ux86_64_getcontext_trace
.hidden _Ux86_64_getcontext_trace
.type _Ux86_64_getcontext_trace, @function
_Ux86_64_getcontext_trace:
.cfi_startproc
/* Save only RBP, RBX, RSP, RIP - exclude this call. */
movq %rbp, UC_MCONTEXT_GREGS_RBP(%rdi)
movq %rbx, UC_MCONTEXT_GREGS_RBX(%rdi)
leaq 8(%rsp), %rax
movq %rax, UC_MCONTEXT_GREGS_RSP(%rdi)
movq 0(%rsp), %rax
movq %rax, UC_MCONTEXT_GREGS_RIP(%rdi)
xorq %rax, %rax
retq
.cfi_endproc
.size _Ux86_64_getcontext_trace, . - _Ux86_64_getcontext_trace
/* We do not need executable stack. */
.section .note.GNU-stack,"",@progbits