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Add custom getcontext() implementation for Android.

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This adds a minimalistic implementation of getcontext()
for Android/ARM and Android/x86. The provided code is
in assembly and only implements the bare minimum required
by Breakpad to get the current processor state.

Note that:

- The FPU state is not saved to the ucontext_t on ARM.
  (that's actually the main difference with a normal
   getcontext() implementation).

  This is normal. On Linux/ARM, such state must be
  obtained with PTRACE_GETVFPREGS instead. This will
  be implemented in a future patch.

- On x86, only the 'regular' FPU state is saved, to
  mimic the GLibc/i386 implementation. The state of
  SSE/SSE2/etc registers is not part of the upstream
  getcontext() implementation.
Review URL: https://breakpad.appspot.com/444002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1024 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
digit@chromium.org 2012-08-31 18:38:29 +00:00
parent fa064e215b
commit 7e3c538af1
12 changed files with 1354 additions and 95 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/common/android/include/sys/ucontext.h
View file

@ -50,11 +50,15 @@ extern "C" {
#include <asm/sigcontext.h>
typedef struct sigcontext mcontext_t;
// The ARM kernel uses a 64-bit signal mask.
typedef uint32_t kernel_sigmask_t[2];
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
kernel_sigmask_t uc_sigmask;
// Other fields are not used by Google Breakpad. Don't define them.
} ucontext_t;
@ -110,12 +114,16 @@ enum {
REG_SS,
};
// The i386 kernel uses a 64-bit signal mask.
typedef uint32_t kernel_sigmask_t[2];
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
// Other fields are not used by Google Breakpad. Don't define them.
kernel_sigmask_t uc_sigmask;
struct _libc_fpstate __fpregs_mem;
} ucontext_t;
#elif defined(__mips__)
@ -142,11 +150,15 @@ typedef struct {
uint32_t lo3;
} mcontext_t;
// The MIPS kernel uses a 128-bit signal mask.
typedef uint32_t kernel_sigmask_t[4];
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
kernel_sigmask_t uc_sigmask;
// Other fields are not used by Google Breakpad. Don't define them.
} ucontext_t;

25
src/common/android/include/ucontext.h
View file

@ -30,12 +30,27 @@
#ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H
#define GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H
#include <sys/cdefs.h>
#ifdef __BIONIC_UCONTEXT_H
#include <ucontext.h>
#else
#include <sys/ucontext.h>
// TODO: Provide a portable implementation of getcontext() then
// update ExceptionHandler::WriteMinidump() in
// src/client/linux/handler/exception_handler.cc to use it.
//
// extern int getcontext(ucontext_t* ucp);
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
// Provided by src/android/common/breakpad_getcontext.S
int breakpad_getcontext(ucontext_t* ucp);
#define getcontext(x) breakpad_getcontext(x)
#ifdef __cplusplus
} // extern "C"
#endif // __cplusplus
#endif // __BIONIC_UCONTEXT_H
#endif // GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H