#define _UAPI_ASM_X86_SIGCONTEXT_H
/*
- * Linux signal context definitions. The sigcontext includes a complex hierarchy of CPU
- * and FPU state, available to user-space (on the stack) when a signal handler is
- * executed.
+ * Linux signal context definitions. The sigcontext includes a complex
+ * hierarchy of CPU and FPU state, available to user-space (on the stack) when
+ * a signal handler is executed.
*
- * As over the years this ABI grew from its very simple roots towards supporting more and
- * more CPU state organically, some of the details (which were rather clever hacks back
- * in the days) became a bit quirky by today.
+ * As over the years this ABI grew from its very simple roots towards
+ * supporting more and more CPU state organically, some of the details (which
+ * were rather clever hacks back in the days) became a bit quirky by today.
*
- * The current ABI includes flexible provisions for future extensions, so we won't have
- * to grow new quirks for quite some time. Promise!
+ * The current ABI includes flexible provisions for future extensions, so we
+ * won't have to grow new quirks for quite some time. Promise!
*/
#include <linux/compiler.h>
/*
* Bytes 464..511 in the current 512-byte layout of the FXSAVE/FXRSTOR frame
- * are reserved for SW usage. On CPUs supporting XSAVE/XRSTOR, these bytes
- * are used to extend the fpstate pointer in the sigcontext, which now
- * includes the extended state information along with fpstate information.
+ * are reserved for SW usage. On CPUs supporting XSAVE/XRSTOR, these bytes are
+ * used to extend the fpstate pointer in the sigcontext, which now includes the
+ * extended state information along with fpstate information.
*
- * If sw_reserved.magic1 == FP_XSTATE_MAGIC1 then there's a sw_reserved.extended_size
- * bytes large extended context area present. (The last 32-bit word of this extended
- * area (at the fpstate+extended_size-FP_XSTATE_MAGIC2_SIZE address) is set to
+ * If sw_reserved.magic1 == FP_XSTATE_MAGIC1 then there's a
+ * sw_reserved.extended_size bytes large extended context area present. (The
+ * last 32-bit word of this extended area (at the
+ * fpstate+extended_size-FP_XSTATE_MAGIC2_SIZE address) is set to
* FP_XSTATE_MAGIC2 so that you can sanity check your size calculations.)
*
- * This extended area typically grows with newer CPUs that have larger and larger
- * XSAVE areas.
+ * This extended area typically grows with newer CPUs that have larger and
+ * larger XSAVE areas.
*/
struct _fpx_sw_bytes {
- /* If set to FP_XSTATE_MAGIC1 then this is an xstate context. 0 if a legacy frame. */
+ /*
+ * If set to FP_XSTATE_MAGIC1 then this is an xstate context.
+ * 0 if a legacy frame.
+ */
__u32 magic1;
/*
* Total size of the fpstate area:
*
* - if magic1 == 0 then it's sizeof(struct _fpstate)
- * - if magic1 == FP_XSTATE_MAGIC1 then it's sizeof(struct _xstate) plus extensions (if any)
+ * - if magic1 == FP_XSTATE_MAGIC1 then it's sizeof(struct _xstate)
+ * plus extensions (if any)
*/
__u32 extended_size;
__u32 padding[7];
};
-#ifdef __i386__
/*
* As documented in the iBCS2 standard:
*
- * The first part of "struct _fpstate" is just the normal i387
- * hardware setup, the extra "status" word is used to save the
- * coprocessor status word before entering the handler.
+ * The first part of "struct _fpstate" is just the normal i387 hardware setup,
+ * the extra "status" word is used to save the coprocessor status word before
+ * entering the handler.
*
- * The FPU state data structure has had to grow to accommodate the
- * extended FPU state required by the Streaming SIMD Extensions.
- * There is no documented standard to accomplish this at the moment.
+ * The FPU state data structure has had to grow to accommodate the extended FPU
+ * state required by the Streaming SIMD Extensions. There is no documented
+ * standard to accomplish this at the moment.
*/
/* 10-byte legacy floating point register: */
struct _fpreg {
- unsigned short significand[4];
- unsigned short exponent;
+ __u16 significand[4];
+ __u16 exponent;
};
/* 16-byte floating point register: */
struct _fpxreg {
- unsigned short significand[4];
- unsigned short exponent;
- unsigned short padding[3];
+ __u16 significand[4];
+ __u16 exponent;
+ __u16 padding[3];
};
/* 16-byte XMM register: */
struct _xmmreg {
- unsigned long element[4];
+ __u32 element[4];
};
#define X86_FXSR_MAGIC 0x0000
-struct _fpstate {
+/*
+ * The 32-bit FPU frame:
+ */
+struct _fpstate_32 {
/* Legacy FPU environment: */
- unsigned long cw;
- unsigned long sw;
- unsigned long tag;
- unsigned long ipoff;
- unsigned long cssel;
- unsigned long dataoff;
- unsigned long datasel;
+ __u32 cw;
+ __u32 sw;
+ __u32 tag;
+ __u32 ipoff;
+ __u32 cssel;
+ __u32 dataoff;
+ __u32 datasel;
struct _fpreg _st[8];
- unsigned short status;
- unsigned short magic; /* 0xffff: regular FPU data only */
+ __u16 status;
+ __u16 magic; /* 0xffff: regular FPU data only */
/* 0x0000: FXSR FPU data */
/* FXSR FPU environment */
- unsigned long _fxsr_env[6]; /* FXSR FPU env is ignored */
- unsigned long mxcsr;
- unsigned long reserved;
+ __u32 _fxsr_env[6]; /* FXSR FPU env is ignored */
+ __u32 mxcsr;
+ __u32 reserved;
struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
struct _xmmreg _xmm[8]; /* First 8 XMM registers */
- unsigned long padding1[44]; /* Second 8 XMM registers plus padding */
+ union {
+ __u32 padding1[44]; /* Second 8 XMM registers plus padding */
+ __u32 padding[44]; /* Alias name for old user-space */
+ };
union {
- unsigned long padding2[12];
+ __u32 padding2[12];
struct _fpx_sw_bytes sw_reserved; /* Potential extended state is encoded here */
};
};
-# ifndef __KERNEL__
/*
- * User-space might still rely on the old definition:
- */
-struct sigcontext {
- unsigned short gs, __gsh;
- unsigned short fs, __fsh;
- unsigned short es, __esh;
- unsigned short ds, __dsh;
- unsigned long edi;
- unsigned long esi;
- unsigned long ebp;
- unsigned long esp;
- unsigned long ebx;
- unsigned long edx;
- unsigned long ecx;
- unsigned long eax;
- unsigned long trapno;
- unsigned long err;
- unsigned long eip;
- unsigned short cs, __csh;
- unsigned long eflags;
- unsigned long esp_at_signal;
- unsigned short ss, __ssh;
- struct _fpstate __user *fpstate;
- unsigned long oldmask;
- unsigned long cr2;
-};
-# endif /* !__KERNEL__ */
-
-#else /* __x86_64__: */
-
-/*
- * The FXSAVE frame.
+ * The 64-bit FPU frame. (FXSAVE format and later)
*
* Note1: If sw_reserved.magic1 == FP_XSTATE_MAGIC1 then the structure is
* larger: 'struct _xstate'. Note that 'struct _xstate' embedds
* 'struct _fpstate' so that you can always assume the _fpstate portion
* exists so that you can check the magic value.
*
- * Note2: Reserved fields may someday contain valuable data. Always save/restore
- * them when you change signal frames.
+ * Note2: Reserved fields may someday contain valuable data. Always
+ * save/restore them when you change signal frames.
*/
-struct _fpstate {
+struct _fpstate_64 {
__u16 cwd;
__u16 swd;
/* Note this is not the same as the 32-bit/x87/FSAVE twd: */
};
};
-# ifndef __KERNEL__
+#ifdef __i386__
+# define _fpstate _fpstate_32
+#else
+# define _fpstate _fpstate_64
+#endif
+
+struct _header {
+ __u64 xfeatures;
+ __u64 reserved1[2];
+ __u64 reserved2[5];
+};
+
+struct _ymmh_state {
+ /* 16x YMM registers, 16 bytes each: */
+ __u32 ymmh_space[64];
+};
+
+/*
+ * Extended state pointed to by sigcontext::fpstate.
+ *
+ * In addition to the fpstate, information encoded in _xstate::xstate_hdr
+ * indicates the presence of other extended state information supported
+ * by the CPU and kernel:
+ */
+struct _xstate {
+ struct _fpstate fpstate;
+ struct _header xstate_hdr;
+ struct _ymmh_state ymmh;
+ /* New processor state extensions go here: */
+};
+
+/*
+ * The 32-bit signal frame:
+ */
+struct sigcontext_32 {
+ __u16 gs, __gsh;
+ __u16 fs, __fsh;
+ __u16 es, __esh;
+ __u16 ds, __dsh;
+ __u32 di;
+ __u32 si;
+ __u32 bp;
+ __u32 sp;
+ __u32 bx;
+ __u32 dx;
+ __u32 cx;
+ __u32 ax;
+ __u32 trapno;
+ __u32 err;
+ __u32 ip;
+ __u16 cs, __csh;
+ __u32 flags;
+ __u32 sp_at_signal;
+ __u16 ss, __ssh;
+
+ /*
+ * fpstate is really (struct _fpstate *) or (struct _xstate *)
+ * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
+ * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
+ * of extended memory layout. See comments at the definition of
+ * (struct _fpx_sw_bytes)
+ */
+ __u32 fpstate; /* Zero when no FPU/extended context */
+ __u32 oldmask;
+ __u32 cr2;
+};
+
+/*
+ * The 64-bit signal frame:
+ */
+struct sigcontext_64 {
+ __u64 r8;
+ __u64 r9;
+ __u64 r10;
+ __u64 r11;
+ __u64 r12;
+ __u64 r13;
+ __u64 r14;
+ __u64 r15;
+ __u64 di;
+ __u64 si;
+ __u64 bp;
+ __u64 bx;
+ __u64 dx;
+ __u64 ax;
+ __u64 cx;
+ __u64 sp;
+ __u64 ip;
+ __u64 flags;
+ __u16 cs;
+ __u16 gs;
+ __u16 fs;
+ __u16 __pad0;
+ __u64 err;
+ __u64 trapno;
+ __u64 oldmask;
+ __u64 cr2;
+
+ /*
+ * fpstate is really (struct _fpstate *) or (struct _xstate *)
+ * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
+ * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
+ * of extended memory layout. See comments at the definition of
+ * (struct _fpx_sw_bytes)
+ */
+ __u64 fpstate; /* Zero when no FPU/extended context */
+ __u64 reserved1[8];
+};
+
/*
- * User-space might still rely on the old definition:
+ * Create the real 'struct sigcontext' type:
*/
+#ifdef __KERNEL__
+# ifdef __i386__
+# define sigcontext sigcontext_32
+# else
+# define sigcontext sigcontext_64
+# endif
+#endif
+
+/*
+ * The old user-space sigcontext definition, just in case user-space still
+ * relies on it. The kernel definition (in asm/sigcontext.h) has unified
+ * field names but otherwise the same layout.
+ */
+#ifndef __KERNEL__
+
+#define _fpstate_ia32 _fpstate_32
+#define sigcontext_ia32 sigcontext_32
+
+
+# ifdef __i386__
+struct sigcontext {
+ __u16 gs, __gsh;
+ __u16 fs, __fsh;
+ __u16 es, __esh;
+ __u16 ds, __dsh;
+ __u32 edi;
+ __u32 esi;
+ __u32 ebp;
+ __u32 esp;
+ __u32 ebx;
+ __u32 edx;
+ __u32 ecx;
+ __u32 eax;
+ __u32 trapno;
+ __u32 err;
+ __u32 eip;
+ __u16 cs, __csh;
+ __u32 eflags;
+ __u32 esp_at_signal;
+ __u16 ss, __ssh;
+ struct _fpstate __user *fpstate;
+ __u32 oldmask;
+ __u32 cr2;
+};
+# else /* __x86_64__: */
struct sigcontext {
__u64 r8;
__u64 r9;
# endif
__u64 reserved1[8];
};
-# endif /* !__KERNEL__ */
-
-#endif /* __x86_64__ */
-
-struct _header {
- __u64 xfeatures;
- __u64 reserved1[2];
- __u64 reserved2[5];
-};
-
-struct _ymmh_state {
- /* 16x YMM registers, 16 bytes each: */
- __u32 ymmh_space[64];
-};
-
-/*
- * Extended state pointed to by sigcontext::fpstate.
- *
- * In addition to the fpstate, information encoded in _xstate::xstate_hdr
- * indicates the presence of other extended state information supported
- * by the CPU and kernel:
- */
-struct _xstate {
- struct _fpstate fpstate;
- struct _header xstate_hdr;
- struct _ymmh_state ymmh;
- /* New processor state extensions go here: */
-};
+# endif /* __x86_64__ */
+#endif /* !__KERNEL__ */
#endif /* _UAPI_ASM_X86_SIGCONTEXT_H */
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