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ptrace register reading debugging

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This commit is contained in:
Ryan Fleury
2025-08-04 12:36:04 -07:00
parent 209c5e96b8
commit 9c2bdf492f
1 changed files with 28 additions and 4 deletions
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src/demon/linux/demon_core_linux.c
+28 -4
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@@ -564,7 +564,8 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
struct iovec iov_gpr = {0};
iov_gpr.iov_len = sizeof(ctx);
iov_gpr.iov_base = &ctx;
if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, &iov_gpr) != -1)
int ptrace_result = ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, &iov_gpr);
if(ptrace_result != -1)
{
got_gpr = 1;
DMN_LNX_UserRegsX64 *src = &ctx.regs;
@@ -595,6 +596,13 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
dst->rip.u64 = src->rip;
dst->rflags.u64 = src->rflags;
}
else
{
int error_code = errno;
(void)error_code;
int x = 0;
(void)x;
}
}
//- rjf: read FPR
@@ -612,12 +620,20 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
struct iovec iov_xsave = {0};
iov_xsave.iov_len = sizeof(xsave_buffer);
iov_xsave.iov_base = xsave_buffer;
if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_X86_XSTATE, &iov_xsave) != -1)
int ptrace_result = ptrace(PTRACE_GETREGSET, tid, (void*)NT_X86_XSTATE, &iov_xsave);
if(ptrace_result != -1)
{
xsave = push_array_no_zero(scratch.arena, DMN_LNX_XSave, 1);
MemoryCopy(xsave, xsave_buffer, sizeof(*xsave));
xsave_legacy = &xsave->legacy;
}
else
{
int error_code = errno;
(void)error_code;
int x = 0;
(void)x;
}
}
// rjf: try fxsave
@@ -627,11 +643,19 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
struct iovec iov_fxsave = {0};
iov_fxsave.iov_len = sizeof(fxsave);
iov_fxsave.iov_base = &fxsave;
if(ptrace(PTRACE_GETREGSET, tid, (void *)NT_FPREGSET, &iov_fxsave) != -1)
int ptrace_result = ptrace(PTRACE_GETREGSET, tid, (void *)NT_FPREGSET, &iov_fxsave);
if(ptrace_result != -1)
{
xsave_legacy = push_array_no_zero(scratch.arena, DMN_LNX_XSaveLegacy, 1);
MemoryCopy(xsave_legacy, &fxsave, sizeof(*xsave_legacy));
}
else
{
int error_code = errno;
(void)error_code;
int x = 0;
(void)x;
}
}
// rjf: fill from xsave legacy
@@ -909,7 +933,7 @@ dmn_ctrl_exclusive_access_end(void)
{
OS_MutexScope(dmn_lnx_state->access_mutex)
{
dmn_lnx_state->access_run_state = 1;
dmn_lnx_state->access_run_state = 0;
}
}