int hbp_set(pid_t pid, t_hbp *hbp)
{
int dr7;
errno = 0;
dr7 = get_debug_register(pid, 7);
dr7 |= HBP_SET_DR7(hbp->regnum, hbp->scope, hbp->access, hbp->len);
set_debug_register(pid, 7, dr7);
set_debug_register(pid, 6, 0);
set_debug_register(pid, hbp->regnum, hbp->addr);
dr7 = get_debug_register(pid, 7);
return (errno);
}
//------------------------------------------------------------------------------
// Name: set_state
// Desc:
//------------------------------------------------------------------------------
void PlatformThread::set_state(const State &state) {
// TODO: assert that we are paused
if(auto state_impl = static_cast<PlatformState *>(state.impl_)) {
bool setPrStatusDone=false;
if(EDB_IS_32_BIT && state_impl->is64Bit()) {
// Try to set 64-bit state
PrStatus_X86_64 prstat64;
state_impl->fillStruct(prstat64);
iovec prstat_iov = {&prstat64, sizeof(prstat64)};
if(ptrace(PTRACE_SETREGSET, tid_, NT_PRSTATUS, &prstat_iov) != -1)
setPrStatusDone=true;
else
perror("PTRACE_SETREGSET failed");
}
// Fallback to setting 32-bit set
if(!setPrStatusDone) {
user_regs_struct regs;
state_impl->fillStruct(regs);
ptrace(PTRACE_SETREGS, tid_, 0, ®s);
}
// debug registers
for(std::size_t i=0;i<8;++i)
set_debug_register(i,state_impl->x86.dbgRegs[i]);
static bool xsaveSupported=true; // hope for the best, adjust for reality
if(xsaveSupported) {
X86XState xstate;
const auto size=state_impl->fillStruct(xstate);
iovec iov={&xstate,size};
if(ptrace(PTRACE_SETREGSET, tid_, NT_X86_XSTATE, &iov)==-1)
xsaveSupported=false;
}
// If xsave/xrstor appears unsupported, fallback to fxrstor
// NOTE: it's not "else", it's an independent check for possibly modified flag
if(!xsaveSupported) {
static bool setFPXRegsSupported=EDB_IS_32_BIT;
if(setFPXRegsSupported) {
UserFPXRegsStructX86 fpxregs;
state_impl->fillStruct(fpxregs);
setFPXRegsSupported=(ptrace(PTRACE_SETFPXREGS, tid_, 0, &fpxregs)!=-1);
}
if(!setFPXRegsSupported) {
// No SETFPXREGS: on x86 this means SSE is not supported
// on x86_64 FPREGS already contain SSE state
// Just set fpregs then
user_fpregs_struct fpregs;
state_impl->fillStruct(fpregs);
if(ptrace(PTRACE_SETFPREGS, tid_, 0, &fpregs)==-1)
perror("PTRACE_SETFPREGS failed");
}
}
}
}
int hbp_unset(int pid, t_hbp *hbp)
{
int dr7;
errno = 0;
dr7 = get_debug_register(pid, 7);
if (errno)
return (-1);
dr7 &= ~(HBP_SET_DR7(hbp->regnum, hbp->scope, hbp->access, hbp->len));
set_debug_register(pid, 7, dr7);
return (errno);
}
//------------------------------------------------------------------------------
// Name: set_state
// Desc:
//------------------------------------------------------------------------------
void DebuggerCore::set_state(const State &state) {
// TODO: assert that we are paused
if(attached()) {
if(auto state_impl = static_cast<PlatformState *>(state.impl_)) {
bool setRegSetDone=false;
if(EDB_IS_32_BIT && state_impl->is64Bit()) {
// Try to set 64-bit state
PrStatus_X86_64 prstat64;
state_impl->fillStruct(prstat64);
iovec prstat_iov = {&prstat64, sizeof(prstat64)};
if(ptrace(PTRACE_SETREGSET, active_thread_, NT_PRSTATUS, &prstat_iov) != -1)
setRegSetDone=true;
else
perror("PTRACE_SETREGSET failed");
}
// Fallback to setting 32-bit set
if(!setRegSetDone) {
user_regs_struct regs;
state_impl->fillStruct(regs);
ptrace(PTRACE_SETREGS, active_thread_, 0, ®s);
}
// debug registers
for(std::size_t i=0;i<8;++i)
set_debug_register(i,state_impl->x86.dbgRegs[i]);
// FPU registers
user_fpregs_struct fpregs;
state_impl->fillStruct(fpregs);
if(ptrace(PTRACE_SETFPREGS, active_thread_, 0, &fpregs)==-1)
perror("PTRACE_SETFPREGS failed");
}
}
}
