diff options
| -rw-r--r-- | ChangeLog | 16 | ||||
| -rw-r--r-- | sysdeps/i386/__longjmp.S | 8 | ||||
| -rw-r--r-- | sysdeps/i386/bits/setjmp.h | 26 | ||||
| -rw-r--r-- | sysdeps/i386/bp-asm.h | 7 | ||||
| -rw-r--r-- | sysdeps/i386/bsd-_setjmp.S | 21 | ||||
| -rw-r--r-- | sysdeps/i386/bsd-setjmp.S | 21 | ||||
| -rw-r--r-- | sysdeps/i386/elf/setjmp.S | 55 | ||||
| -rw-r--r-- | sysdeps/i386/setjmp.S | 39 |
8 files changed, 122 insertions, 71 deletions
@@ -1,3 +1,18 @@ +2000-06-29 Greg McGary <greg@mcgary.org> + + * sysdeps/i386/bp-asm.h (PCOFF): New constant. + (POP_ERRNO_LOCATION_RETURN): Fold insns. + * sysdeps/i386/bits/setjmp.h (JB_SIZE): New constant. + (PUSH_SIGNAL_MASK): New macro. + * sysdeps/i386/__longjmp.S (__longjmp): Wrap symbol in BP_SYM (). + LEAVE is unnecessary. Check bounds of jmp_buf. + * sysdeps/i386/elf/setjmp.S: Call PUSH_SIGNAL_MASK. Wrap symbols + in BP_SYM (). Check bounds of jmp_buf. Don't call LEAVE until + immediately before tail-call. + * sysdeps/i386/setjmp.S: Likewise. + * sysdeps/i386/bsd-_setjmp.S: Likewise. + * sysdeps/i386/bsd-setjmp.S: Likewise. + 2000-06-29 Jakub Jelinek <jakub@redhat.com> * sysdeps/sparc/fpu/fclrexcpt.c: Use SHLIB_COMPAT, compat_symbol and @@ -209,7 +224,6 @@ 2000-06-26 Greg McGary <greg@mcgary.org> - * sysdeps/i386/bp-asm.h (POP_ERRNO_LOCATION_RETURN): Fold insns. * sysdeps/unix/i386/sysdep.S (syscall_error): Push & pop space for BP return value & push implicit struct-return pointer to __errno_location. diff --git a/sysdeps/i386/__longjmp.S b/sysdeps/i386/__longjmp.S index 54f31361be..a6d67a7b17 100644 --- a/sysdeps/i386/__longjmp.S +++ b/sysdeps/i386/__longjmp.S @@ -21,17 +21,19 @@ #define _ASM #define _SETJMP_H #include <bits/setjmp.h> +#include <asm-syntax.h> +#include <bp-sym.h> #include <bp-asm.h> #define PARMS LINKAGE /* no space for saved regs */ #define JBUF PARMS #define VAL JBUF+PTR_SIZE -ENTRY (__longjmp) +ENTRY (BP_SYM (__longjmp)) ENTER movl JBUF(%esp), %ecx /* User's jmp_buf in %ecx. */ - LEAVE + CHECK_BOUNDS_BOTH_WIDE (%ecx, JBUF(%esp), $JB_SIZE) movl VAL(%esp), %eax /* Second argument is return value. */ /* Save the return address now. */ @@ -44,4 +46,4 @@ ENTRY (__longjmp) movl (JB_SP*4)(%ecx), %esp /* Jump to saved PC. */ jmp *%edx -END (__longjmp) +END (BP_SYM (__longjmp)) diff --git a/sysdeps/i386/bits/setjmp.h b/sysdeps/i386/bits/setjmp.h index 2f5b44531a..327e5670ac 100644 --- a/sysdeps/i386/bits/setjmp.h +++ b/sysdeps/i386/bits/setjmp.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1997, 1998 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -29,9 +29,31 @@ # define JB_BP 3 # define JB_SP 4 # define JB_PC 5 +# define JB_SIZE 24 #endif -#ifndef _ASM +#ifdef _ASM +/* We internally convert all setjmp (buf) calls to sigsetjmp (buf, mask), + so we must shift with the call frame to insert the mask argument. */ +# if __BOUNDED_POINTERS__ +# define PUSH_SIGNAL_MASK(MASK) \ + popl %eax; /* return address */ \ + popl %ecx; /* jmp_buf value */ \ + popl %edx; /* jmp_buf low bound */ \ + pushl 0(%esp); /* jmp_buf high bound */ \ + movel $MASK, 4(%esp); \ + pushl %edx; \ + pushl %ecx; \ + pushl %eax +# else +# define PUSH_SIGNAL_MASK(MASK) \ + popl %eax; /* return address */ \ + popl %ecx; /* jmp_buf */ \ + pushl $MASK; \ + pushl %ecx; \ + pushl %eax +# endif +#else typedef int __jmp_buf[6]; #endif diff --git a/sysdeps/i386/bp-asm.h b/sysdeps/i386/bp-asm.h index 197c6da88c..bde1f6a14a 100644 --- a/sysdeps/i386/bp-asm.h +++ b/sysdeps/i386/bp-asm.h @@ -43,6 +43,8 @@ /* Stack space overhead of procedure-call linkage: return address and frame pointer. */ # define LINKAGE 8 +/* Stack offset of return address after calling ENTER. */ +# define PCOFF 4 /* Int 5 is the "bound range" exception also raised by the "bound" instruction. */ @@ -106,8 +108,7 @@ argument, but we must pop the space for the BP itself. We also dereference the return value in order to dig out the pointer value. */ # define POP_ERRNO_LOCATION_RETURN \ - movl (%esp), %eax; \ - addl $4, %esp; \ + popl %eax; \ addl $8, %esp # else /* !__BOUNDED_POINTERS__ */ @@ -123,6 +124,8 @@ # define LEAVE /* Stack space overhead of procedure-call linkage: return address only. */ # define LINKAGE 4 +/* Stack offset of return address after calling ENTER. */ +# define PCOFF 0 # define CHECK_BOUNDS_LOW(VAL_REG, BP_MEM) # define CHECK_BOUNDS_HIGH(VAL_REG, BP_MEM, Jcc) diff --git a/sysdeps/i386/bsd-_setjmp.S b/sysdeps/i386/bsd-_setjmp.S index 47972b28d1..0983ba8e97 100644 --- a/sysdeps/i386/bsd-_setjmp.S +++ b/sysdeps/i386/bsd-_setjmp.S @@ -1,5 +1,5 @@ /* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'. i386 version. - Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1994, 1995, 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -22,13 +22,14 @@ in setjmp doesn't clobber the state restored by longjmp. */ #include <sysdep.h> +#define _ASM +#define _SETJMP_H +#include <bits/setjmp.h> +#include "bp-sym.h" +#include "bp-asm.h" -ENTRY (_setjmp) - popl %eax /* Pop return PC. */ - popl %ecx /* Pop jmp_buf argument. */ - pushl $0 /* Push second argument of zero. */ - pushl %ecx /* Push back first argument. */ - pushl %eax /* Push back return PC. */ +ENTRY (BP_SYM (_setjmp)) + PUSH_SIGNAL_MASK (0) #ifdef PIC /* We cannot use the PLT, because it requires that %ebx be set, but we can't save and restore our caller's value. Instead, we do an @@ -37,9 +38,9 @@ ENTRY (_setjmp) call here here: popl %ecx addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx - movl C_SYMBOL_NAME(__sigsetjmp@GOT)(%ecx), %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigsetjmp)@GOT)(%ecx), %ecx jmp *%ecx #else - jmp __sigsetjmp + jmp BP_SYM (__sigsetjmp) #endif -END (_setjmp) +END (BP_SYM (_setjmp)) diff --git a/sysdeps/i386/bsd-setjmp.S b/sysdeps/i386/bsd-setjmp.S index 411eaf1eb2..b26b0e1186 100644 --- a/sysdeps/i386/bsd-setjmp.S +++ b/sysdeps/i386/bsd-setjmp.S @@ -1,5 +1,5 @@ /* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version. - Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1994, 1995, 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -22,13 +22,14 @@ in setjmp doesn't clobber the state restored by longjmp. */ #include <sysdep.h> +#define _ASM +#define _SETJMP_H +#include <bits/setjmp.h> +#include "bp-sym.h" +#include "bp-asm.h" -ENTRY (setjmp) - popl %eax /* Pop return PC. */ - popl %ecx /* Pop jmp_buf argument. */ - pushl $1 /* Push second argument of one. */ - pushl %ecx /* Push back first argument. */ - pushl %eax /* Push back return PC. */ +ENTRY (BP_SYM (setjmp)) + PUSH_SIGNAL_MASK (1) #ifdef PIC /* We cannot use the PLT, because it requires that %ebx be set, but we can't save and restore our caller's value. Instead, we do an @@ -37,9 +38,9 @@ ENTRY (setjmp) call here here: popl %ecx addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx - movl C_SYMBOL_NAME(__sigsetjmp@GOT)(%ecx), %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigsetjmp)@GOT)(%ecx), %ecx jmp *%ecx #else - jmp __sigsetjmp + jmp BP_SYM (__sigsetjmp) #endif -END (setjmp) +END (BP_SYM (setjmp)) diff --git a/sysdeps/i386/elf/setjmp.S b/sysdeps/i386/elf/setjmp.S index e734809bf8..1d600a489f 100644 --- a/sysdeps/i386/elf/setjmp.S +++ b/sysdeps/i386/elf/setjmp.S @@ -21,50 +21,49 @@ #define _ASM #define _SETJMP_H #include <bits/setjmp.h> +#include "bp-sym.h" #include "bp-asm.h" -#define PARMS LINKAGE /* no space for saved regs */ -#define JBUF PARMS -#define SGMSK JBUF+PRT_SIZE - /* We include the BSD entry points here as well but we make them weak. */ -ENTRY (setjmp) - .weak C_SYMBOL_NAME (setjmp) - popl %eax /* Pop return PC. */ - popl %ecx /* Pop jmp_buf argument. */ - pushl $1 /* Push second argument of zero. */ - pushl %ecx /* Push back first argument. */ - pushl %eax /* Push back return PC. */ +ENTRY (BP_SYM (setjmp)) + .weak C_SYMBOL_NAME (BP_SYM (setjmp)) + PUSH_SIGNAL_MASK (1) /* Note that we have to use a non-exported symbol in the next jump since otherwise gas will emit it as a jump through the PLT which is what we cannot use here. */ jmp .Linternal_sigsetjmp -END (setjmp) +END (BP_SYM (setjmp)) /* Binary compatibility entry point. */ -ENTRY (_setjmp) - .weak C_SYMBOL_NAME (_setjmp) -ENTRY (__setjmp) - popl %eax /* Pop return address. */ - popl %ecx /* Pop jmp_buf. */ - pushl $0 /* Push zero argument. */ - pushl %ecx /* Push jmp_buf. */ - pushl %eax /* Push back return address. */ +ENTRY (BP_SYM (_setjmp)) + .weak C_SYMBOL_NAME (BP_SYM (_setjmp)) +ENTRY (BP_SYM (__setjmp)) + PUSH_SIGNAL_MASK (0) + /* FALL THROUGH */ + +#define PARMS LINKAGE /* no space for saved regs */ +#define JMPBUF PARMS +#define SIGMSK JMPBUF+PTR_SIZE + +ENTRY (BP_SYM (__sigsetjmp)) +.Linternal_sigsetjmp = BP_SYM (__sigsetjmp) + ENTER + + movl JMPBUF(%esp), %eax + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE) -ENTRY (__sigsetjmp) -.Linternal_sigsetjmp = __sigsetjmp - movl 4(%esp), %eax /* User's jmp_buf in %eax. */ /* Save registers. */ movl %ebx, (JB_BX*4)(%eax) movl %esi, (JB_SI*4)(%eax) movl %edi, (JB_DI*4)(%eax) movl %ebp, (JB_BP*4)(%eax) - leal JBUF(%esp), %ecx /* Save SP as it will be after we return. */ + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ movl %ecx, (JB_SP*4)(%eax) - movl 0(%esp), %ecx /* Save PC we are returning to now. */ + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */ movl %ecx, (JB_PC*4)(%eax) + LEAVE /* pop frame pointer to prepare for tail-call. */ /* Make a tail call to __sigjmp_save; it takes the same args. */ #ifdef PIC /* We cannot use the PLT, because it requires that %ebx be set, but @@ -74,9 +73,9 @@ ENTRY (__sigsetjmp) call here here: popl %ecx addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx - movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOT)(%ecx), %ecx jmp *%ecx #else - jmp __sigjmp_save + jmp BP_SYM (__sigjmp_save) #endif -END (__sigsetjmp) +END (BP_SYM (__sigsetjmp)) diff --git a/sysdeps/i386/setjmp.S b/sysdeps/i386/setjmp.S index 598eef78e7..25b7ac8fef 100644 --- a/sysdeps/i386/setjmp.S +++ b/sysdeps/i386/setjmp.S @@ -1,5 +1,5 @@ /* setjmp for i386. - Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -19,29 +19,38 @@ #include <sysdep.h> #define _ASM +#define _SETJMP_H #include <bits/setjmp.h> #include <asm-syntax.h> +#include "bp-sym.h" +#include "bp-asm.h" /* Binary compatibility entry point. */ -ENTRY (__setjmp) - popl %eax /* Pop return address. */ - popl %ecx /* Pop jmp_buf. */ - pushl $0 /* Push zero argument. */ - pushl %ecx /* Push jmp_buf. */ - pushl %eax /* Push back return address. */ - -ENTRY (__sigsetjmp) - movl 4(%esp), %eax /* User's jmp_buf in %eax. */ +ENTRY (BP_SYM (__setjmp)) + PUSH_SIGNAL_MASK (0) + /* FALL THROUGH */ + +#define PARMS LINKAGE /* no space for saved regs */ +#define JMPBUF PARMS +#define SIGMSK JMPBUF+PTR_SIZE + +ENTRY (BP_SYM (__sigsetjmp)) + ENTER + + movl JMPBUF(%esp), %eax + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE) + /* Save registers. */ movl %ebx, (JB_BX*4)(%eax) movl %esi, (JB_SI*4)(%eax) movl %edi, (JB_DI*4)(%eax) movl %ebp, (JB_BP*4)(%eax) - leal 4(%esp), %ecx /* Save SP as it will be after we return. */ + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ movl %ecx, (JB_SP*4)(%eax) - movl 0(%esp), %ecx /* Save PC we are returning to now. */ + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */ movl %ecx, (JB_PC*4)(%eax) + LEAVE /* pop frame pointer to prepare for tail-call. */ /* Make a tail call to __sigjmp_save; it takes the same args. */ #ifdef PIC /* We cannot use the PLT, because it requires that %ebx be set, but @@ -52,9 +61,9 @@ ENTRY (__sigsetjmp) L(here): popl %ecx addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx - movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOT)(%ecx), %ecx jmp *%ecx #else - jmp __sigjmp_save + jmp BP_SYM (__sigjmp_save) #endif -END (__sigsetjmp) +END (BP_SYM (__sigsetjmp)) |