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Diffstat (limited to 'libjava/sysdep/i386/backtrace.h')
-rw-r--r-- | libjava/sysdep/i386/backtrace.h | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/libjava/sysdep/i386/backtrace.h b/libjava/sysdep/i386/backtrace.h deleted file mode 100644 index cfdf07b..0000000 --- a/libjava/sysdep/i386/backtrace.h +++ /dev/null @@ -1,123 +0,0 @@ -// backtrace.h - Fallback backtrace implementation. i386 implementation. - -/* Copyright (C) 2005, 2006 Free Software Foundation - - This file is part of libgcj. - -This software is copyrighted work licensed under the terms of the -Libgcj License. Please consult the file "LIBGCJ_LICENSE" for -details. */ - -#ifndef __SYSDEP_BACKTRACE_H__ -#define __SYSDEP_BACKTRACE_H__ - -#include <java-stack.h> - -#ifdef __CYGWIN__ -/* To allow this to link as a DLL. */ -#define MAIN_FUNC dll_crt0__FP11per_process -extern "C" int MAIN_FUNC () __declspec(dllimport); -#elif defined (_WIN32) -#define MAIN_FUNC DllMain -extern "C" int __stdcall MAIN_FUNC (void *, unsigned long, void *); -#else /* !__CYGWIN__ && !_WIN32 */ -#define MAIN_FUNC main -extern int MAIN_FUNC (int, char **); -#endif /* ?__CYGWIN__ */ - -/* The context used to keep track of our position while unwinding through - the call stack. */ -struct _Unwind_Context -{ - /* The starting address of the method. */ - _Jv_uintptr_t meth_addr; - - /* The return address in the method. */ - _Jv_uintptr_t ret_addr; -}; - -#ifdef __USING_SJLJ_EXCEPTIONS__ - -#undef _Unwind_GetIPInfo -#define _Unwind_GetIPInfo(ctx,ip_before_insn) \ - (*(ip_before_insn) = 1, (ctx)->ret_addr) - -#undef _Unwind_GetRegionStart -#define _Unwind_GetRegionStart(ctx) \ - ((ctx)->meth_addr) - -#undef _Unwind_Backtrace -#define _Unwind_Backtrace(trace_fn,state_ptr) \ - (fallback_backtrace (trace_fn, state_ptr)) - -#endif /* __USING_SJLJ_EXCEPTIONS__ */ - -/* Unwind through the call stack calling TRACE_FN with STATE for each stack - frame. Returns the reason why the unwinding was stopped. */ -_Unwind_Reason_Code -fallback_backtrace (_Unwind_Trace_Fn trace_fn, _Jv_UnwindState *state) -{ - register _Jv_uintptr_t *_ebp __asm__ ("ebp"); - register _Jv_uintptr_t _esp __asm__ ("esp"); - _Jv_uintptr_t rfp; - _Unwind_Context ctx; - - for (rfp = *_ebp; rfp; rfp = *(_Jv_uintptr_t *)rfp) - { - /* Sanity checks to eliminate dubious-looking frame pointer chains. - The frame pointer should be a 32-bit word-aligned stack address. - Since the stack grows downwards on x86, the frame pointer must have - a value greater than the current value of the stack pointer, it - should not be below the supposed next frame pointer and it should - not be too far off from the supposed next frame pointer. */ - int diff = *(_Jv_uintptr_t *)rfp - rfp; - if ((rfp & 0x00000003) != 0 || rfp < _esp - || diff > 4 * 1024 || diff < 0) - break; - - /* Get the return address in the calling function. This is stored on - the stack just before the value of the old frame pointer. */ - ctx.ret_addr = *(_Jv_uintptr_t *)(rfp + sizeof (_Jv_uintptr_t)); - - /* Try to locate a "pushl %ebp; movl %esp, %ebp" function prologue - by scanning backwards at even addresses below the return address. - This instruction sequence is encoded either as 0x55 0x89 0xE5 or as - 0x55 0x8B 0xEC. We give up if we do not find this sequence even - after scanning 1024K of memory. - FIXME: This is not robust and will probably give us false positives, - but this is about the best we can do if we do not have DWARF-2 unwind - information based exception handling. */ - ctx.meth_addr = (_Jv_uintptr_t)NULL; - _Jv_uintptr_t scan_addr = (ctx.ret_addr & 0xFFFFFFFE) - 2; - _Jv_uintptr_t limit_addr - = (scan_addr > 1024 * 1024) ? (scan_addr - 1024 * 1024) : 2; - for ( ; scan_addr >= limit_addr; scan_addr -= 2) - { - unsigned char *scan_bytes = (unsigned char *)scan_addr; - if (scan_bytes[0] == 0x55 - && ((scan_bytes[1] == 0x89 && scan_bytes[2] == 0xE5) - || (scan_bytes[1] == 0x8B && scan_bytes[2] == 0xEC))) - { - ctx.meth_addr = scan_addr; - break; - } - } - - /* Now call the unwinder callback function. */ - if (trace_fn != NULL) - (*trace_fn) (&ctx, state); - - /* No need to unwind beyond _Jv_RunMain(), _Jv_ThreadStart or - main(). */ - void *jv_runmain - = (void *)(void (*)(JvVMInitArgs *, jclass, const char *, int, - const char **, bool))_Jv_RunMain; - if (ctx.meth_addr == (_Jv_uintptr_t)jv_runmain - || ctx.meth_addr == (_Jv_uintptr_t)_Jv_ThreadStart - || (ctx.meth_addr - (_Jv_uintptr_t)MAIN_FUNC) < 16) - break; - } - - return _URC_NO_REASON; -} -#endif |