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90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include <cstdio>
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#include <signal.h>
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#ifdef ANDROID
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#include <asm/sigcontext.h>
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#else
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#include <execinfo.h>
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#include <sys/ucontext.h> // Look in here for the context definition.
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#endif
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#include "Common/Common.h"
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#include "Core/MemTools.h"
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#include "Core/HW/Memmap.h"
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#include "Core/PowerPC/JitInterface.h"
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#include "Core/PowerPC/PowerPC.h"
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#include "Core/PowerPC/JitCommon/JitBase.h"
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namespace EMM
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{
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#ifdef ANDROID
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typedef struct sigcontext mcontext_t;
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typedef struct ucontext {
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uint32_t uc_flags;
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struct ucontext* uc_link;
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stack_t uc_stack;
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mcontext_t uc_mcontext;
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// Other fields are not used by Google Breakpad. Don't define them.
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} ucontext_t;
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#endif
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void sigsegv_handler(int signal, siginfo_t *info, void *raw_context)
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{
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if (signal != SIGSEGV)
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{
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// We are not interested in other signals - handle it as usual.
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return;
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}
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ucontext_t *context = (ucontext_t *)raw_context;
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int sicode = info->si_code;
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if (sicode != SEGV_MAPERR && sicode != SEGV_ACCERR)
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{
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// Huh? Return.
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return;
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}
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// Get all the information we can out of the context.
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mcontext_t *ctx = &context->uc_mcontext;
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void *fault_memory_ptr = (void*)ctx->arm_r10;
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u8 *fault_instruction_ptr = (u8 *)ctx->arm_pc;
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if (!JitInterface::IsInCodeSpace(fault_instruction_ptr))
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{
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// Let's not prevent debugging.
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return;
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}
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u64 bad_address = (u64)fault_memory_ptr;
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u64 memspace_bottom = (u64)Memory::base;
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if (bad_address < memspace_bottom)
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{
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PanicAlertT("Exception handler - access below memory space. %08llx%08llx",
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bad_address >> 32, bad_address);
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}
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u32 em_address = (u32)(bad_address - memspace_bottom);
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const u8 *new_rip = jit->BackPatch(fault_instruction_ptr, em_address, ctx);
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if (new_rip)
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{
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ctx->arm_pc = (u32) new_rip;
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}
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}
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void InstallExceptionHandler()
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{
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struct sigaction sa;
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sa.sa_handler = 0;
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sa.sa_sigaction = &sigsegv_handler;
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sa.sa_flags = SA_SIGINFO;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGSEGV, &sa, nullptr);
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}
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} // namespace
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