X-Git-Url: https://git.saurik.com/apple/libc.git/blobdiff_plain/3d9156a7a519a5e3aa1b92e9d9d4b991f1aed7ff..ad3c9f2af814c84582fdd1649e49ec4f68572c5a:/sys/sigtramp.c

diff --git a/sys/sigtramp.c b/sys/sigtramp.c
index b387329..74f4963 100644
--- a/sys/sigtramp.c
+++ b/sys/sigtramp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999, 2007 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -26,9 +26,13 @@
 #import	"sigcatch.h"
 #import	<sys/types.h>
 #import	<signal.h>
+#import	<strings.h>
+#import	<unistd.h>
 #import	<ucontext.h>
 #import	<mach/thread_status.h>
 
+extern int __sigreturn(ucontext_t *, int);
+
 /*
  * sigvec registers _sigtramp as the handler for any signal requiring
  * user-mode intervention.  All _sigtramp does is find the real handler,
@@ -36,16 +40,18 @@
  *
  * Note that the kernel saves/restores all of our register state.
  */
-#if defined(__DYNAMIC__)
+
+/* On i386, i386/sys/_sigtramp.s defines this.  */
+#if defined(__DYNAMIC__) && ! defined(__i386__)
 int __in_sigtramp = 0;
 #endif
 
 /* These defn should match the kernel one */
 #define UC_TRAD			1
+#define UC_FLAVOR		30
 #if defined(__ppc__) || defined(__ppc64__)
 #define UC_TRAD64		20
 #define UC_TRAD64_VEC		25
-#define UC_FLAVOR		30
 #define UC_FLAVOR_VEC		35
 #define UC_FLAVOR64		40
 #define UC_FLAVOR64_VEC		45
@@ -62,7 +68,10 @@ int __in_sigtramp = 0;
 #define UC_FLAVOR64_VEC_SIZE ((PPC_THREAD_STATE64_COUNT + PPC_EXCEPTION_STATE64_COUNT + PPC_FLOAT_STATE_COUNT + PPC_VECTOR_STATE_COUNT) * sizeof(int))
 #endif
 
-#if defined(__ppc__) || defined(__ppc64__)
+#define UC_SET_ALT_STACK	0x40000000
+#define UC_RESET_ALT_STACK	0x80000000
+
+#if defined(__ppc__)
 /* This routine will be replaced by an assembly soon */
 static  int
 restore64_state(mcontext_t mctx, mcontext64_t mctx64, int sigstyle)
@@ -73,47 +82,47 @@ restore64_state(mcontext_t mctx, mcontext64_t mctx64, int sigstyle)
 		return(0);	
 	if (mctx->ss.r0 != (unsigned int)mctx64->ss.r0)
 		return(0);	
-	if (mctx->ss.r1 != (unsigned int)mctx->ss.r1)
+	if (mctx->ss.r1 != (unsigned int)mctx64->ss.r1)
 		return(0);	
-	if (mctx->ss.r2 != (unsigned int)mctx->ss.r2)
+	if (mctx->ss.r2 != (unsigned int)mctx64->ss.r2)
 		return(0);	
-	if (mctx->ss.r3 != (unsigned int)mctx->ss.r3)
+	if (mctx->ss.r3 != (unsigned int)mctx64->ss.r3)
 		return(0);	
-	if (mctx->ss.r4 != (unsigned int)mctx->ss.r4)
+	if (mctx->ss.r4 != (unsigned int)mctx64->ss.r4)
 		return(0);	
-	if (mctx->ss.r5 != (unsigned int)mctx->ss.r5)
+	if (mctx->ss.r5 != (unsigned int)mctx64->ss.r5)
 		return(0);	
-	if (mctx->ss.r6 != (unsigned int)mctx->ss.r6)
+	if (mctx->ss.r6 != (unsigned int)mctx64->ss.r6)
 		return(0);	
-	if (mctx->ss.r7 != (unsigned int)mctx->ss.r7)
+	if (mctx->ss.r7 != (unsigned int)mctx64->ss.r7)
 		return(0);	
-	if (mctx->ss.r8 != (unsigned int)mctx->ss.r8)
+	if (mctx->ss.r8 != (unsigned int)mctx64->ss.r8)
 		return(0);	
-	if (mctx->ss.r9 != (unsigned int)mctx->ss.r9)
+	if (mctx->ss.r9 != (unsigned int)mctx64->ss.r9)
 		return(0);	
-	if (mctx->ss.r10 != (unsigned int)mctx->ss.r10)
+	if (mctx->ss.r10 != (unsigned int)mctx64->ss.r10)
 		return(0);	
-	if (mctx->ss.r11 != (unsigned int)mctx->ss.r11)
+	if (mctx->ss.r11 != (unsigned int)mctx64->ss.r11)
 		return(0);	
-	if (mctx->ss.r12 != (unsigned int)mctx->ss.r12)
+	if (mctx->ss.r12 != (unsigned int)mctx64->ss.r12)
 		return(0);	
-	if (mctx->ss.r13 != (unsigned int)mctx->ss.r13)
+	if (mctx->ss.r13 != (unsigned int)mctx64->ss.r13)
 		return(0);	
-	if (mctx->ss.r14 != (unsigned int)mctx->ss.r14)
+	if (mctx->ss.r14 != (unsigned int)mctx64->ss.r14)
 		return(0);	
-	if (mctx->ss.r15 != (unsigned int)mctx->ss.r15)
+	if (mctx->ss.r15 != (unsigned int)mctx64->ss.r15)
 		return(0);	
-	if (mctx->ss.r16 != (unsigned int)mctx->ss.r16)
+	if (mctx->ss.r16 != (unsigned int)mctx64->ss.r16)
 		return(0);	
-	if (mctx->ss.r17 != (unsigned int)mctx->ss.r17)
+	if (mctx->ss.r17 != (unsigned int)mctx64->ss.r17)
 		return(0);	
-	if (mctx->ss.r18 != (unsigned int)mctx->ss.r18)
+	if (mctx->ss.r18 != (unsigned int)mctx64->ss.r18)
 		return(0);	
-	if (mctx->ss.r19 != (unsigned int)mctx->ss.r19)
+	if (mctx->ss.r19 != (unsigned int)mctx64->ss.r19)
 		return(0);	
-	if (mctx->ss.r20 != (unsigned int)mctx->ss.r20)
+	if (mctx->ss.r20 != (unsigned int)mctx64->ss.r20)
 		return(0);	
-	if (mctx->ss.r21 != (unsigned int)mctx->ss.r21)
+	if (mctx->ss.r21 != (unsigned int)mctx64->ss.r21)
 		return(0);	
 	if (mctx->ss.r22 != (unsigned int)mctx64->ss.r22)
 		return(0);	
@@ -145,7 +154,7 @@ restore64_state(mcontext_t mctx, mcontext64_t mctx64, int sigstyle)
 	if (mctx->ss.ctr != (unsigned int)mctx64->ss.ctr)
 		return(0);	
 
-	if (bcmp(&mctx->fs, &mctx64->ss, (PPC_FLOAT_STATE_COUNT * sizeof(int))))
+	if (bcmp(&mctx->fs, &mctx64->fs, (PPC_FLOAT_STATE_COUNT * sizeof(int))))
 		return(0);
 	if ((sigstyle == UC_DUAL_VEC) && bcmp(&mctx->vs, &mctx64->vs, (PPC_VECTOR_STATE_COUNT * sizeof(int))))
 		return(0);
@@ -154,35 +163,18 @@ restore64_state(mcontext_t mctx, mcontext64_t mctx64, int sigstyle)
 
 }
 
-#endif 
+/* This routine is called from ppc/sys/_sigtramp.s on return from
+   sa_handler.  */
 
 void
-_sigtramp(
-	union __sigaction_u __sigaction_u,
-	int 			sigstyle,
-	int 			sig,
-	siginfo_t		*sinfo,
-	ucontext_t		*uctx
+__finish_sigtramp(
+	ucontext_t		*uctx,
+	int 			sigstyle
 ) {
-#if defined(__ppc__) || defined(__ppc64__)
 	int ctxstyle = UC_FLAVOR;
-#endif
 	mcontext_t mctx;
 	mcontext64_t mctx64;
 
-#if defined(__DYNAMIC__)
-        __in_sigtramp++;
-#endif
-#ifdef __i386__
-	if (sigstyle == UC_TRAD)
-        	sa_handler(sig);
-#elif defined(__ppc__) || defined(__ppc64__)
-	if ((sigstyle == UC_TRAD) || (sigstyle == UC_TRAD64) || (sigstyle == UC_TRAD64_VEC))
-        	sa_handler(sig);
-
-	else
-        	sa_sigaction(sig, sinfo, uctx);
-		
 	 if ((sigstyle == UC_DUAL) || (sigstyle == UC_DUAL_VEC)) {
 		mctx = uctx->uc_mcontext;
 		mctx64 = (mcontext64_t)((char *)(uctx->uc_mcontext) + sizeof(struct mcontext));
@@ -204,19 +196,64 @@ _sigtramp(
 		}
 	} else
 		ctxstyle = sigstyle;
-#endif /* __ppc__ || __ppc64__ */
 
 #if defined(__DYNAMIC__)
         __in_sigtramp--;
 #endif
-#if defined(__ppc__) || defined(__ppc64__)
-	{
+
+	__sigreturn (uctx, ctxstyle);
+}
+
+#endif /* ppc */
+
+/*
+ * Reset the kernel's idea of the use of an alternate stack; this is used by
+ * both longjmp() and siglongjmp().  Nothing other than this reset is needed,
+ * since restoring the registers and other operations that would normally be
+ * done by sigreturn() are handled in user space, so we do not pass a user
+ * context (in PPC, a user context is not the same as a jmpbuf mcontext, due
+ * to having more than one set of registers, etc., for the various 32/64 etc.
+ * contexts)..
+ */
+void
+_sigunaltstack(int set)
+{
         /* sigreturn(uctx, ctxstyle); */
 	/* syscall (SYS_SIGRETURN, uctx, ctxstyle); */
-	syscall (184, uctx, ctxstyle);
+	__sigreturn (NULL, (set == SS_ONSTACK) ? UC_SET_ALT_STACK : UC_RESET_ALT_STACK);
+}
+
+/* On these architectures, _sigtramp is implemented in assembly to
+   ensure it matches its DWARF unwind information.  */
+#if ! defined (__ppc__) && ! defined (__ppc64__) && ! defined (__i386__) \
+  && ! defined (__x86_64__)
+
+void
+_sigtramp(
+	union __sigaction_u __sigaction_u,
+	int 			sigstyle,
+	int 			sig,
+	siginfo_t		*sinfo,
+	ucontext_t		*uctx
+) {
+	int ctxstyle = UC_FLAVOR;
+
+#if defined(__DYNAMIC__)
+        __in_sigtramp++;
+#endif
+
+	if (sigstyle == UC_TRAD)
+        	sa_handler(sig);
+	else {
+		sa_sigaction(sig, sinfo, uctx);
 	}
-#else
-	sigreturn(uctx);
-#endif /* __ppc__ || __ppc64__ */
+
+#if defined(__DYNAMIC__)
+        __in_sigtramp--;
+#endif
+        /* sigreturn(uctx, ctxstyle); */
+	/* syscall (SYS_SIGRETURN, uctx, ctxstyle); */
+	__sigreturn (uctx, ctxstyle);
 }
 
+#endif /* not ppc nor ppc64 nor i386 nor x86_64 */