Reimplemented setjmp(). It no longer offsets the caller's esp.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25428 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/posix/arch/x86/Jamfile

@@ -7,7 +7,6 @@ local genericSources =
 ;
 
 MergeObject posix_arch_$(TARGET_ARCH).o :
-	setjmp.S
 	sigsetjmp.S
 	siglongjmp.S
 

src/system/libroot/posix/arch/x86/setjmp.S

@@ -1,20 +0,0 @@
-/*
- * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
- * Distributed under the terms of the MIT License.
- */
-
-
-#include "setjmp_internal.h"
-
-
-/* int setjmp(jmp_buf buffer) */
-FUNCTION(setjmp):
-	pop		%eax		// pop argument and return pointer from stack
-	pop		%ecx
-	pushl	$0			// push new argument (for saveMask) and old stuff
-	push	%ecx		// back onto the stack
-	push	%eax
-	jmp		__sigsetjmp	// let sigsetjmp() do the actual work
-
-#pragma weak _setjmp=setjmp
-

src/system/libroot/posix/arch/x86/sigsetjmp.S

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2008, Ingo Weinhold, ingo_weinhold@gmx.de.
  * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
@@ -15,23 +16,45 @@
  *	if it was asked to do this.
  */
 
-
 /* int sigsetjmp(jmp_buf buffer, int saveMask) */
 FUNCTION(__sigsetjmp):
 FUNCTION(sigsetjmp):
+	// return address to %edx, stack pointer for return to %ecx (both are
+	// scratch registers)
+	mov		0(%esp), %edx
+	lea		4(%esp), %ecx
+
+	// buffer to %eax
 	mov		4(%esp), %eax
 
-	// fill __jmp_buf structure with current registers (%ecx can be clobbered)
+sigsetjmp_setjmp_entry:
+	// fill __jmp_buf structure with current registers
 	mov		%ebx, JMP_REGS_EBX(%eax)
 	mov		%esi, JMP_REGS_ESI(%eax)
 	mov		%edi, JMP_REGS_EDI(%eax)
 	mov		%ebp, JMP_REGS_EBP(%eax)
 
 	// save stack and return address (because that's where we intend to jump to)
-	lea		4(%esp,1), %ecx
 	mov		%ecx, JMP_REGS_ESP(%eax)
-	mov		0(%esp), %ecx
+	mov		%edx, JMP_REGS_PC(%eax)
-	mov		%ecx, JMP_REGS_PC(%eax)
 
 	jmp		__setjmp_save_sigs
 
+
+/* int setjmp(jmp_buf buffer) */
+FUNCTION(setjmp):
+	// prepare %edx, %ecx, and %eax for sigsetjmp
+	mov		0(%esp), %edx
+	lea		4(%esp), %ecx
+	mov		(%ecx), %eax
+
+	// let sigsetjmp do the real work
+	pushl	$0							// saveMask
+	push	%eax						// buffer
+	call	sigsetjmp_setjmp_entry
+	add		$8, %esp
+
+	ret
+
+
+#pragma weak _setjmp=setjmp