diff options
| author | Ricardo Branco <rbranco@suse.de> | 2026-04-26 14:43:59 +0000 |
|---|---|---|
| committer | Pouria Mousavizadeh Tehrani <pouria@FreeBSD.org> | 2026-06-02 07:25:34 +0000 |
| commit | b84d31ee74535a0026ff83f2a34c07b7557f9785 (patch) | |
| tree | 8206869a7fa457cf430be72eb750903d4924ca18 | |
| parent | 7b26353a59d66dc1bc611fd042a49b9e3bd13699 (diff) | |
linux: Add linux_pt_fpregset and bsd_to_linux_fpregset() for amd64
Add struct linux_pt_fpregset, the amd64 Linux NT_PRFPREG payload,
corresponding to user_i387_struct in Linux. The struct describes
the 512-byte FXSAVE area as exposed by PTRACE_GETREGSET.
Add bsd_to_linux_fpregset() to translate from FreeBSD's struct fpreg
to struct linux_pt_fpregset. Fields are extracted from the fpr_env[]
array which stores the FXSAVE environment packed as four 64-bit words.
The FP and XMM register banks are bulk-copied as opaque byte arrays.
Signed-off-by: Ricardo Branco <rbranco@suse.de>
Reviewed by: kib
Pull-Request: https://github.com/freebsd/freebsd-src/pull/2165
| -rw-r--r-- | sys/amd64/linux/linux.h | 18 | ||||
| -rw-r--r-- | sys/amd64/linux/linux_machdep.c | 20 |
2 files changed, 38 insertions, 0 deletions
diff --git a/sys/amd64/linux/linux.h b/sys/amd64/linux/linux.h index fb7aaa2d731c..8e025b73dbd8 100644 --- a/sys/amd64/linux/linux.h +++ b/sys/amd64/linux/linux.h @@ -237,14 +237,32 @@ struct linux_pt_regset { l_ulong gs; }; +/* This corresponds to 'user_i387_struct' in Linux. */ +struct linux_pt_fpregset { + l_ushort cwd; + l_ushort swd; + l_ushort twd; + l_ushort fop; + uint64_t rip; + uint64_t rdp; + uint32_t mxcsr; + uint32_t mxcsr_mask; + uint32_t st_space[32]; + uint32_t xmm_space[64]; + uint32_t padding[24]; +}; + #ifdef _KERNEL struct reg; +struct fpreg; struct syscall_info; void bsd_to_linux_regset(const struct reg *b_reg, struct linux_pt_regset *l_regset); void linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset); +void bsd_to_linux_fpregset(const struct fpreg *b_fpreg, + struct linux_pt_fpregset *l_fpregset); void linux_ptrace_get_syscall_info_machdep(const struct reg *reg, struct syscall_info *si); int linux_ptrace_getregs_machdep(struct thread *td, pid_t pid, diff --git a/sys/amd64/linux/linux_machdep.c b/sys/amd64/linux/linux_machdep.c index 7ec1ec56bb95..e05f824cbea1 100644 --- a/sys/amd64/linux/linux_machdep.c +++ b/sys/amd64/linux/linux_machdep.c @@ -282,6 +282,26 @@ linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset) } void +bsd_to_linux_fpregset(const struct fpreg *b_fpreg, + struct linux_pt_fpregset *l_fpregset) +{ + l_fpregset->cwd = b_fpreg->fpr_env[0]; + l_fpregset->swd = b_fpreg->fpr_env[0] >> 16; + l_fpregset->twd = b_fpreg->fpr_env[0] >> 32; + l_fpregset->fop = b_fpreg->fpr_env[0] >> 48; + l_fpregset->rip = b_fpreg->fpr_env[1]; + l_fpregset->rdp = b_fpreg->fpr_env[2]; + l_fpregset->mxcsr = b_fpreg->fpr_env[3]; + l_fpregset->mxcsr_mask = b_fpreg->fpr_env[3] >> 32; + + memcpy(l_fpregset->st_space, b_fpreg->fpr_acc, + sizeof(l_fpregset->st_space)); + memcpy(l_fpregset->xmm_space, b_fpreg->fpr_xacc, + sizeof(l_fpregset->xmm_space)); + memset(l_fpregset->padding, 0, sizeof(l_fpregset->padding)); +} + +void linux_ptrace_get_syscall_info_machdep(const struct reg *reg, struct syscall_info *si) { |