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Copy pathcontext.cpp
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186 lines (153 loc) · 4.98 KB
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Copy pathcontext.cpp
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186 lines (153 loc) · 4.98 KB
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/*
This file is part of libswirl
*/
#include "license/bsd"
#include "context.h"
#define fault_printf(...)
#if defined(_ANDROID)
#include <asm/sigcontext.h>
#else
#if HOST_OS == OS_DARWIN
#define _XOPEN_SOURCE 1
#define __USE_GNU 1
#endif
#if !defined(TARGET_NO_EXCEPTIONS)
#include <ucontext.h>
#endif
#endif
//////
#define UCTX(p) (((ucontext_t *)(segfault_ctx)) p)
#if HOST_OS == OS_DARWIN
#define UCTX_type ucontext_t
#define UCTX_data (UCTX())
#else
#define UCTX_type ucontext_t
#define UCTX_data (UCTX())
#endif
template <typename Ta, typename Tb>
void bicopy(Ta& rei, Tb& seg, bool to_segfault) {
if (to_segfault) {
seg = rei;
}
else {
rei = seg;
}
}
#if !defined(TARGET_NO_EXCEPTIONS)
static thread_local UCTX_type segfault_copy;
#endif
void segfault_store(void* segfault_ctx) {
#if !defined(TARGET_NO_EXCEPTIONS)
memcpy(&segfault_copy, UCTX_data, sizeof(segfault_copy));
fault_printf("sgctx stored, %d\n", sizeof(segfault_copy));
#endif
}
void segfault_load(void* segfault_ctx) {
#if !defined(TARGET_NO_EXCEPTIONS)
memcpy(UCTX_data, &segfault_copy, sizeof(*UCTX_data));
fault_printf("sgctx loaded, %d\n", sizeof(*UCTX_data));
#endif
}
#define MCTX(p) (((UCTX_type*)segfault_ctx)->uc_mcontext p)
void context_segfault_bicopy(rei_host_context_t* reictx, void* segfault_ctx, bool to_segfault) {
#if !defined(TARGET_NO_EXCEPTIONS)
#if HOST_CPU == CPU_ARM
#if defined(__FreeBSD__)
bicopy(reictx->pc, MCTX(.__gregs[_REG_PC]), to_segfault);
for (int i = 0; i < 15; i++)
bicopy(reictx->regs[i], MCTX(.__gregs[i]), to_segfault);
#elif HOST_OS == OS_LINUX
bicopy(reictx->pc, MCTX(.arm_pc), to_segfault);
u32* r =(u32*) &MCTX(.arm_r0);
for (int i = 0; i < 15; i++)
bicopy(reictx->regs[i], r[i], to_segfault);
#elif HOST_OS == OS_DARWIN
bicopy(reictx->pc, MCTX(->__ss.__pc), to_segfault);
for (int i = 0; i < 15; i++)
bicopy(reictx->regs[i], MCTX(->__ss.__r[i]), to_segfault);
#else
#error HOST_OS
#endif
#elif HOST_CPU == CPU_ARM64
bicopy(reictx->pc, MCTX(.pc), to_segfault);
#elif HOST_CPU == CPU_X86
#if defined(__FreeBSD__)
bicopy(reictx->pc, MCTX(.mc_eip), to_segfault);
bicopy(reictx->esp, MCTX(.mc_esp), to_segfault);
bicopy(reictx->eax, MCTX(.mc_eax), to_segfault);
bicopy(reictx->ecx, MCTX(.mc_ecx), to_segfault);
#elif HOST_OS == OS_LINUX
bicopy(reictx->pc, MCTX(.gregs[REG_EIP]), to_segfault);
bicopy(reictx->esp, MCTX(.gregs[REG_ESP]), to_segfault);
bicopy(reictx->eax, MCTX(.gregs[REG_EAX]), to_segfault);
bicopy(reictx->ecx, MCTX(.gregs[REG_ECX]), to_segfault);
#elif HOST_OS == OS_DARWIN
bicopy(reictx->pc, MCTX(->__ss.__eip), to_segfault);
bicopy(reictx->esp, MCTX(->__ss.__esp), to_segfault);
bicopy(reictx->eax, MCTX(->__ss.__eax), to_segfault);
bicopy(reictx->ecx, MCTX(->__ss.__ecx), to_segfault);
#else
#error HOST_OS
#endif
#elif HOST_CPU == CPU_X64
#if defined(__FreeBSD__) || defined(__DragonFly__)
bicopy(reictx->pc, MCTX(.mc_rip), to_segfault);
#elif defined(__NetBSD__)
bicopy(reictx->pc, MCTX(.__gregs[_REG_RIP]), to_segfault);
#elif HOST_OS == OS_LINUX
fault_printf("pc set: %d, value: %p %p\n", to_segfault, reictx->pc, MCTX(.gregs[REG_RIP]));
bicopy(reictx->pc, MCTX(.gregs[REG_RIP]), to_segfault);
fault_printf("pc set: %d, value: %p %p\n", to_segfault, reictx->pc, MCTX(.gregs[REG_RIP]));
#elif HOST_OS == OS_DARWIN
bicopy(reictx->pc, MCTX(->__ss.__rip), to_segfault);
#else
#error HOST_OS
#endif
#elif HOST_CPU == CPU_MIPS
bicopy(reictx->pc, MCTX(.pc), to_segfault);
#elif HOST_CPU == CPU_GENERIC
//nothing!
#else
#error Unsupported HOST_CPU
#endif
#endif
}
void segfault_set_pc(void* segfault_ctx, unat new_pc, unat* old_pc)
{
#if !defined(TARGET_NO_EXCEPTIONS)
rei_host_context_t ctx;
context_segfault_bicopy(&ctx, UCTX_data, false);
fault_printf("segfault_set_pc: old pc: %lx\n", ctx.pc);
*old_pc = ctx.pc;
#if HOST_CPU == CPU_ARM
// if THUMB, store the pointer in BX-compatible format
if (MCTX(.arm_cpsr) & (1<<5))
*old_pc += 1;
ctx.pc = new_pc & ~1; // THUMB Bit set on CPSR, no need to set it here
// restore from BX-compatible pointer
// set THUMB bit accordingly
if (new_pc & 1)
MCTX(.arm_cpsr) |= (1<<5);
else
MCTX(.arm_cpsr) &= ~(1<<5);
#else
ctx.pc = new_pc;
#endif
context_segfault_bicopy(&ctx, UCTX_data, true);
fault_printf("segfault_set_pc: new pc: %lx\n", ctx.pc);
#endif
}
void context_from_segfault(rei_host_context_t* reictx) {
#if !defined(TARGET_NO_EXCEPTIONS)
fault_printf("context from segfault pc: %p, %p\n",reictx->pc, segfault_copy.gregs[REG_RIP]);
context_segfault_bicopy(reictx, &segfault_copy, false);
fault_printf("context from segfault pc: %p, %p\n",reictx->pc, segfault_copy.gregs[REG_RIP]);
#endif
}
void context_to_segfault(rei_host_context_t* reictx) {
#if !defined(TARGET_NO_EXCEPTIONS)
fault_printf("context to segfault pc: %p, %p\n",reictx->pc, segfault_copy.gregs[REG_RIP]);
context_segfault_bicopy(reictx, &segfault_copy, true);
fault_printf("context to segfault pc: %p, %p\n",reictx->pc, segfault_copy.gregs[REG_RIP]);
#endif
}