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| author | Ken Werner <ken.werner@linaro.org> | 2011-10-25 07:33:38 +0000 |
|---|---|---|
| committer | Arun Sharma <asharma@fb.com> | 2011-10-29 17:12:43 -0700 |
| commit | 0eba2169fb19ef0707a2c96201e33769001b5f11 (patch) | |
| tree | 888d0c14a9a3fc722038c88d95e30ffe1b12d962 /include/libunwind-arm.h | |
| parent | 059676cb00cfdd3be17dfdeb25547037737f1b68 (diff) | |
| download | libunwind-0eba2169fb19ef0707a2c96201e33769001b5f11.tar.gz | |
[ARM] Add support for systems that don't support ucontext.h
Define unw_tdep_context rather than using ucontext_t in order to support
systems that lack ucontext.h. Note that POSIX.1-2008 removed getcontext,
makecontext and swapcontext from its specification.
Signed-off-by: Ken Werner <ken.werner@linaro.org>
Diffstat (limited to 'include/libunwind-arm.h')
| -rw-r--r-- | include/libunwind-arm.h | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/include/libunwind-arm.h b/include/libunwind-arm.h index 492331e4..cba380f2 100644 --- a/include/libunwind-arm.h +++ b/include/libunwind-arm.h @@ -30,7 +30,7 @@ extern "C" { #endif #include <inttypes.h> -#include <ucontext.h> +#include <stddef.h> #define UNW_TARGET arm #define UNW_TARGET_ARM 1 @@ -250,8 +250,14 @@ typedef struct unw_tdep_save_loc } unw_tdep_save_loc_t; -/* On ARM, we can directly use ucontext_t as the unwind context. */ -typedef ucontext_t unw_tdep_context_t; +/* On ARM, we define our own unw_tdep_context instead of using ucontext_t. + This allows us to support systems that don't support getcontext and + therefore do not define ucontext_t. */ +typedef struct unw_tdep_context + { + unsigned long regs[16]; + } +unw_tdep_context_t; /* There is no getcontext() on ARM. Use a stub version which only saves GP registers. FIXME: Not ideal, may not be sufficient for all libunwind @@ -259,8 +265,7 @@ typedef ucontext_t unw_tdep_context_t; #ifndef __thumb__ #define unw_tdep_getcontext(uc) (({ \ unw_tdep_context_t *unw_ctx = (uc); \ - register int unw_base asm ("r0") \ - = (int) (&unw_ctx->uc_mcontext.arm_r0); \ + register unsigned long *unw_base asm ("r0") = unw_ctx->regs; \ __asm__ __volatile__ ( \ "stmia %[base], {r0-r15}" \ : : [base] "r" (unw_base) : "memory"); \ @@ -268,8 +273,7 @@ typedef ucontext_t unw_tdep_context_t; #else /* __thumb__ */ #define unw_tdep_getcontext(uc) (({ \ unw_tdep_context_t *unw_ctx = (uc); \ - register int unw_base asm ("r0") \ - = (int) (&unw_ctx->uc_mcontext.arm_r0); \ + register unsigned long *unw_base asm ("r0") = unw_ctx->regs; \ __asm__ __volatile__ ( \ ".align 2\nbx pc\nnop\n.code 32\n" \ "stmia %[base], {r0-r15}\n" \ |