The branch main has been updated by pouria: URL: https://cgit.FreeBSD.org/src/commit/?id=c515e6040614434a9262ee8b5ac54b81476ec7ff
commit c515e6040614434a9262ee8b5ac54b81476ec7ff Author: Ricardo Branco <[email protected]> AuthorDate: 2026-04-26 14:45:35 +0000 Commit: Pouria Mousavizadeh Tehrani <[email protected]> CommitDate: 2026-06-02 07:25:37 +0000 linux: Implement PTRACE_GETREGSET NT_PRFPREG and NT_X86_XSTATE Implement NT_PRFPREG and NT_X86_XSTATE for PTRACE_GETREGSET on amd64. Chrome's crashpad handler uses these to collect floating-point and extended CPU register state for crash dumps. Other architectures retain the previous EINVAL stub behavior. Signed-off-by: Ricardo Branco <[email protected]> PR: 289285 Reviewed by: kib Pull-Request: https://github.com/freebsd/freebsd-src/pull/2165 --- sys/compat/linux/linux_ptrace.c | 91 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 85 insertions(+), 6 deletions(-) diff --git a/sys/compat/linux/linux_ptrace.c b/sys/compat/linux/linux_ptrace.c index 0dbfd2177122..28a4c42190af 100644 --- a/sys/compat/linux/linux_ptrace.c +++ b/sys/compat/linux/linux_ptrace.c @@ -335,6 +335,87 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid_t pid, l_ulong data) return (error); } +#ifdef __amd64__ +static int +linux_ptrace_getregset_prfpreg(struct thread *td, pid_t pid, l_ulong data) +{ + struct fpreg b_fpreg; + struct linux_pt_fpregset l_fpregset; + struct iovec iov; + size_t len; + int error; + + error = copyin((const void *)data, &iov, sizeof(iov)); + if (error != 0) { + linux_msg(td, "copyin error %d", error); + return (error); + } + + error = kern_ptrace(td, PT_GETFPREGS, pid, &b_fpreg, 0); + if (error != 0) + return (error); + + bsd_to_linux_fpregset(&b_fpreg, &l_fpregset); + + len = MIN(iov.iov_len, sizeof(l_fpregset)); + error = copyout(&l_fpregset, iov.iov_base, len); + if (error != 0) { + linux_msg(td, "copyout error %d", error); + return (error); + } + + iov.iov_len = len; + error = copyout(&iov, (void *)data, sizeof(iov)); + if (error != 0) + linux_msg(td, "iov copyout error %d", error); + + return (error); +} + +static int +linux_ptrace_getregset_xstate(struct thread *td, pid_t pid, l_ulong data) +{ + struct ptrace_xstate_info info; + struct iovec iov; + void *xstate; + size_t len; + int error; + + error = copyin((const void *)data, &iov, sizeof(iov)); + if (error != 0) { + linux_msg(td, "copyin error %d", error); + return (error); + } + + error = kern_ptrace(td, PT_GETXSTATE_INFO, pid, &info, sizeof(info)); + if (error != 0) + return (error); + + xstate = malloc(info.xsave_len, M_LINUX, M_WAITOK | M_ZERO); + + error = kern_ptrace(td, PT_GETXSTATE, pid, xstate, info.xsave_len); + if (error != 0) { + free(xstate, M_LINUX); + return (error); + } + + len = MIN(iov.iov_len, info.xsave_len); + error = copyout(xstate, iov.iov_base, len); + free(xstate, M_LINUX); + if (error != 0) { + linux_msg(td, "copyout error %d", error); + return (error); + } + + iov.iov_len = len; + error = copyout(&iov, (void *)data, sizeof(iov)); + if (error != 0) + linux_msg(td, "iov copyout error %d", error); + + return (error); +} +#endif /* __amd64__ */ + static int linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data) { @@ -342,14 +423,12 @@ linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data) switch (addr) { case LINUX_NT_PRSTATUS: return (linux_ptrace_getregset_prstatus(td, pid, data)); +#ifdef __amd64__ case LINUX_NT_PRFPREG: - linux_msg(td, "PTRAGE_GETREGSET NT_PRFPREG not implemented; " - "returning EINVAL"); - return (EINVAL); + return (linux_ptrace_getregset_prfpreg(td, pid, data)); case LINUX_NT_X86_XSTATE: - linux_msg(td, "PTRAGE_GETREGSET NT_X86_XSTATE not implemented; " - "returning EINVAL"); - return (EINVAL); + return (linux_ptrace_getregset_xstate(td, pid, data)); +#endif default: linux_msg(td, "PTRACE_GETREGSET request %#lx not implemented; " "returning EINVAL", addr);
