fixup mcontext stuff to expost gregset_t/fpregset_t as appropriate

arch/arm/bits/signal.h

@@ -2,6 +2,7 @@
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+typedef int greg_t, gregset_t[18];
 typedef struct sigcontext
 {
 	unsigned long trap_no, error_code, oldmask;

arch/i386/bits/signal.h

@@ -2,13 +2,14 @@
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-struct _fpstate {
+typedef int greg_t, gregset_t[19];
+typedef struct _fpstate {
 	unsigned long cw, sw, tag, ipoff, cssel, dataoff, datasel;
 	struct {
 		unsigned short significand[4], exponent;
 	} _st[8];
 	unsigned long status;
-};
+} *fpregset_t;
 struct sigcontext {
 	unsigned short gs, __gsh, fs, __fsh, es, __esh, ds, __dsh;
 	unsigned long edi, esi, ebp, esp, ebx, edx, ecx, eax;
@@ -20,8 +21,8 @@ struct sigcontext {
 	unsigned long oldmask, cr2;
 };
 typedef struct {
-	unsigned gregs[19];
-	struct _fpstate *fpregs;
+	gregset_t gregs;
+	fpregset_t fpregs;
 	unsigned long oldmask, cr2;
 } mcontext_t;
 #else

arch/microblaze/bits/signal.h

@@ -2,6 +2,7 @@
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+typedef unsigned long greg_t, gregset_t[38];
 typedef struct sigcontext
 {
 	struct {

arch/mips/bits/signal.h

@@ -2,13 +2,31 @@
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-typedef struct sigcontext
+typedef unsigned long long greg_t, gregset_t[32];
+typedef struct {
+	union {
+		double fp_dregs[32];
+		struct {
+			float _fp_fregs;
+			unsigned _fp_pad;
+		} fp_fregs[32];
+	} fp_r;
+} fpregset_t;
+struct sigcontext
 {
 	unsigned sc_regmask, sc_status;
 	unsigned long long sc_pc, sc_regs[32], sc_fpregs[32];
 	unsigned sc_ownedfp, sc_fpc_csr, sc_fpc_eir, sc_used_math, sc_dsp;
 	unsigned long long sc_mdhi, sc_mdlo;
 	unsigned long sc_hi1, sc_lo1, sc_hi2, sc_lo2, sc_hi3, sc_lo3;
+};
+typedef struct
+{
+	unsigned regmask, status;
+	unsigned long long pc, regs[32], fpregs[32];
+	unsigned ownedfp, fpc_csr, fpc_eir, used_math, dsp;
+	unsigned long long mdhi, mdlo;
+	unsigned long hi1, lo1, hi2, lo2, hi3, lo3;
 } mcontext_t;
 #else
 typedef struct {

arch/powerpc/bits/signal.h

@@ -3,7 +3,7 @@
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
-typedef unsigned long gregset_t[48];
+typedef unsigned long greg_t, gregset_t[48];
 
 typedef struct {
 	double fpregs[32];

arch/x86_64/bits/signal.h

@@ -2,7 +2,8 @@
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-struct _fpstate {
+typedef long long greg_t, gregset_t[23];
+typedef struct _fpstate {
 	unsigned short cwd, swd, ftw, fop;
 	unsigned long long rip, rdp;
 	unsigned mxcsr, mxcr_mask;
@@ -13,7 +14,7 @@ struct _fpstate {
 		unsigned element[4];
 	} _xmm[16];
 	unsigned padding[24];
-};
+} *fpregset_t;
 struct sigcontext {
 	unsigned long r8, r9, r10, r11, r12, r13, r14, r15;
 	unsigned long rdi, rsi, rbp, rbx, rdx, rax, rcx, rsp, rip, eflags;
@@ -23,8 +24,8 @@ struct sigcontext {
 	unsigned long __reserved1[8];
 };
 typedef struct {
-	unsigned long long gregs[23];
-	struct _fpstate *fpregs;
+	gregset_t gregs;
+	fpregset_t fpregs;
 	unsigned long long __reserved1[8];
 } mcontext_t;
 #else

include/signal.h

@@ -13,6 +13,7 @@ extern "C" {
 
 #ifdef _GNU_SOURCE
 #define __siginfo siginfo
+#define __ucontext ucontext
 #endif
 
 #define __NEED_size_t

include/ucontext.h

@@ -8,8 +8,8 @@ extern "C" {
 
 #include <signal.h>
 
-#ifdef _GNU_SOURCE
-#define ucontext __ucontext
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define NGREG (sizeof(gregset_t)/sizeof(greg_t))
 #endif
 
 struct __ucontext;