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Kernel: Add ptrace commands for reading/writing the debug registers

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This adds PT_PEEKDEBUG and PT_POKEDEBUG to allow for reading/writing
the debug registers, and updates the Kernel's debug handler to read the
new information from the debug status register.
This commit is contained in:
FalseHonesty 2021-04-15 12:34:51 -04:00 • committed by Andreas Kling
parent 97a4c627cb
commit 3123ffb19d
6 changed files with 79 additions and 5 deletions
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5
Userland/Libraries/LibC/sys/ptrace.cpp
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@ -40,7 +40,8 @@ int ptrace(int request, pid_t tid, void* addr, int data)
u32 out_data;
Syscall::SC_ptrace_peek_params peek_params;
if (request == PT_PEEK) {
auto is_peek_type = request == PT_PEEK || request == PT_PEEKDEBUG;
if (is_peek_type) {
peek_params.address = reinterpret_cast<u32*>(addr);
peek_params.out_data = &out_data;
addr = &peek_params;
@ -54,7 +55,7 @@ int ptrace(int request, pid_t tid, void* addr, int data)
};
int rc = syscall(SC_ptrace, &params);
if (request == PT_PEEK) {
if (is_peek_type) {
if (rc < 0) {
errno = -rc;
return -1;

2
Userland/Libraries/LibC/sys/ptrace.h
View file

@ -39,6 +39,8 @@ __BEGIN_DECLS
#define PT_PEEK 7
#define PT_POKE 8
#define PT_SETREGS 9
#define PT_POKEDEBUG 10
#define PT_PEEKDEBUG 11
// FIXME: PID/TID ISSUE
// Affects the entirety of LibDebug and Userland/strace.cpp.