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| author | Edward Tomasz Napierala <trasz@FreeBSD.org> | 2021-10-17 11:20:16 +0000 |
|---|---|---|
| committer | Edward Tomasz Napierala <trasz@FreeBSD.org> | 2021-10-17 11:20:21 +0000 |
| commit | f9246e14848820664539763b72b6fdef408d20e4 (patch) | |
| tree | 8c89a558f26dac851bfda834afa643e34af3955c | |
| parent | 75a9d95b4d0a043ac0f3f8d1efc0982156337eac (diff) | |
| download | src-f9246e14848820664539763b72b6fdef408d20e4.tar.gz src-f9246e14848820664539763b72b6fdef408d20e4.zip | |
linux: Implement some bits of PTRACE_PEEKUSER
This makes Linux gdb from Bionic a little less broken.
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D32455
| -rw-r--r-- | sys/amd64/linux/linux_ptrace.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/sys/amd64/linux/linux_ptrace.c b/sys/amd64/linux/linux_ptrace.c index a59702757972..39587ec9b2ad 100644 --- a/sys/amd64/linux/linux_ptrace.c +++ b/sys/amd64/linux/linux_ptrace.c @@ -97,6 +97,11 @@ __FBSDID("$FreeBSD$"); #define LINUX_PTRACE_SYSCALL_INFO_ENTRY 1 #define LINUX_PTRACE_SYSCALL_INFO_EXIT 2 +#define LINUX_PTRACE_PEEKUSER_ORIG_RAX 120 +#define LINUX_PTRACE_PEEKUSER_RIP 128 +#define LINUX_PTRACE_PEEKUSER_CS 136 +#define LINUX_PTRACE_PEEKUSER_DS 184 + #define LINUX_ARCH_AMD64 0xc000003e static int @@ -286,9 +291,37 @@ linux_ptrace_peek(struct thread *td, pid_t pid, void *addr, void *data) static int linux_ptrace_peekuser(struct thread *td, pid_t pid, void *addr, void *data) { + struct reg b_reg; + uint64_t val; + int error; - linux_msg(td, "PTRACE_PEEKUSER not implemented; returning EINVAL"); - return (EINVAL); + error = kern_ptrace(td, PT_GETREGS, pid, &b_reg, 0); + if (error != 0) + return (error); + + switch ((uintptr_t)addr) { + case LINUX_PTRACE_PEEKUSER_ORIG_RAX: + val = b_reg.r_rax; + break; + case LINUX_PTRACE_PEEKUSER_RIP: + val = b_reg.r_rip; + break; + case LINUX_PTRACE_PEEKUSER_CS: + val = b_reg.r_cs; + break; + case LINUX_PTRACE_PEEKUSER_DS: + val = b_reg.r_ds; + break; + default: + linux_msg(td, "PTRACE_PEEKUSER offset %ld not implemented; " + "returning EINVAL", (uintptr_t)addr); + return (EINVAL); + } + + error = copyout(&val, data, sizeof(val)); + td->td_retval[0] = error; + + return (error); } static int |