diff options
| -rw-r--r-- | sys/amd64/linux/linux_ptrace.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/sys/amd64/linux/linux_ptrace.c b/sys/amd64/linux/linux_ptrace.c index 76ad9b1e25c4..43ecd8892e0f 100644 --- a/sys/amd64/linux/linux_ptrace.c +++ b/sys/amd64/linux/linux_ptrace.c @@ -506,18 +506,18 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid_t pid, l_ulong data) } if (lwpinfo.pl_flags & PL_FLAG_SCE) { /* - * The strace(1) utility depends on RAX being set to -ENOSYS - * on syscall entry; otherwise it loops printing those: - * - * [ Process PID=928 runs in 64 bit mode. ] - * [ Process PID=928 runs in x32 mode. ] + * Undo the mangling done in exception.S:fast_syscall_common(). */ - l_regset.rax = -38; /* -ENOSYS */ + l_regset.r10 = l_regset.rcx; + } + if (lwpinfo.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX)) { /* - * Undo the mangling done in exception.S:fast_syscall_common(). + * In Linux, the syscall number - passed to the syscall + * as rax - is preserved in orig_rax; rax gets overwritten + * with syscall return value. */ - l_regset.r10 = l_regset.rcx; + l_regset.orig_rax = lwpinfo.pl_syscall_code; } len = MIN(iov.iov_len, sizeof(l_regset)); |