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linux: Add linux_pt_fpregset and bsd_to_linux_fpregset() for amd64

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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 <[email protected]>
Reviewed by:	kib
Pull-Request:	https://github.com/freebsd/freebsd-src/pull/2165

(cherry picked from commit b84d31ee74)
This commit is contained in:
Ricardo Branco authored and Pouria Mousavizadeh Tehrani committed 2026-10-26 01:23:09 +03:30
1 parent 29b79c586b
commit d8f8031923
2 files changed
+38
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sys/amd64/linux/linux.h
+18
View File
@@ -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,
sys/amd64/linux/linux_machdep.c
+20
View File
@@ -281,6 +281,26 @@ linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset)
b_reg->r_gs = l_regset->gs;
}
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)