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tst-longjmp_chk passes, tst-longjmp_chk2 fails but that is because of some limitations of kernel signal delivery on sparc that I need to fix, it has nothing to do with the longjmp_chk implementation. (The problem with tst-longjmp_chk2 is that it tries to do a stack fault SIGSEGV within a stack fault SIGSEGV , and the Linux kernel will refuse to setup the signal stack and deliver the signal if the register windows can't be written out to the stack first)
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David S. Miller
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Andreas Schwab
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Oct 14, 2009
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sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S
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| /* Copyright (C) 2009 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 | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| The GNU C Library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with the GNU C Library; if not, write to the Free | ||
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
| 02111-1307 USA. */ | ||
|
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| #include <sysdep.h> | ||
| #include <jmpbuf-offsets.h> | ||
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| #define ENV(base,reg) [%base + (reg * 4)] | ||
| #define ST_FLUSH_WINDOWS 3 | ||
| #define RW_FP [%fp + 0x48] | ||
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| .section .rodata.str1.1,"aMS",@progbits,1 | ||
| .type longjmp_msg,@object | ||
| longjmp_msg: | ||
| .string "longjmp causes uninitialized stack frame" | ||
| .size longjmp_msg, .-longjmp_msg | ||
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| .text | ||
| ENTRY (____longjmp_chk) | ||
| ld ENV(o0,JB_SP), %g5 | ||
| #ifdef PTR_DEMANGLE | ||
| PTR_DEMANGLE (%g5, %g5, %g4) | ||
| #endif | ||
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| cmp %sp, %g5 | ||
| bleu .Lok_norestore | ||
| nop | ||
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| save %sp, -80, %sp | ||
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| clr %o0 | ||
| add %sp, 64, %o1 | ||
| set __NR_sigaltstack, %g1 | ||
| ta 0x10 | ||
| bcs .Lok | ||
| ld [%sp + 64 + 4], %o2 | ||
| andcc %o2, 0x1, %g0 | ||
| be .Lfail | ||
| ld [%sp + 64 + 0], %o0 | ||
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| ld [%sp + 64 + 8], %o1 | ||
| add %o0, %o1, %o0 | ||
| sub %o0, %g3, %o0 | ||
| cmp %o1, %o0 | ||
| bgeu .Lok | ||
| nop | ||
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| .Lfail: | ||
| #ifdef PIC | ||
| 1: call 2f | ||
| sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | ||
| 2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | ||
| add %l7, %o7, %l7 | ||
| #endif | ||
| sethi %hi(longjmp_msg), %o0 | ||
| or %o0, %lo(longjmp_msg), %o0 | ||
| #ifdef PIC | ||
| ld [%l7 + %o0], %o0 | ||
| #endif | ||
| call HIDDEN_JUMPTARGET(__fortify_fail) | ||
| nop | ||
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| .Lok: | ||
| restore | ||
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| .Lok_norestore: | ||
| ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ | ||
| #ifdef PTR_DEMANGLE | ||
| PTR_DEMANGLE2 (%g3, %g3, %g4) | ||
| #endif | ||
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| mov %o0, %g1 /* ENV in %g1 */ | ||
| orcc %o1, %g0, %g2 /* VAL in %g2 */ | ||
| be,a 0f /* Branch if zero; else skip delay slot. */ | ||
| mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ | ||
| 0: | ||
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| /* | ||
| * Do a "flush register windows trap". The trap handler in the | ||
| * kernel writes all the register windows to their stack slots, and | ||
| * marks them all as invalid (needing to be sucked up from the | ||
| * stack when used). This ensures that all information needed to | ||
| * unwind to these callers is in memory, not in the register | ||
| * windows. | ||
| */ | ||
| ta ST_FLUSH_WINDOWS | ||
| #ifdef PTR_DEMANGLE | ||
| ld ENV(g1,JB_PC), %g1 /* Set return PC. */ | ||
| PTR_DEMANGLE2 (%o7, %g1, %g4) | ||
| #else | ||
| ld ENV(g1,JB_PC), %o7 /* Set return PC. */ | ||
| #endif | ||
| mov %g5, %fp | ||
| sub %fp, 64, %sp /* Allocate a register frame. */ | ||
| st %g3, RW_FP /* Set saved FP on restore below. */ | ||
| retl | ||
| restore %g2, 0, %o0 /* Restore values from above register frame. */ | ||
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| END(____longjmp_chk) |
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| /* Copyright (C) 2009 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 | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| The GNU C Library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with the GNU C Library; if not, write to the Free | ||
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
| 02111-1307 USA. */ | ||
|
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| /* longjmp is implemented in terms of the setcontext trap on Linux/Sparc64. */ | ||
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| #include <sysdep.h> | ||
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| /* Offsets into the jmp_buf structure. */ | ||
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| #define O_mask_was_saved 512 | ||
| #define O_gregs 32 | ||
| #define O_g1 (O_gregs + 4*8) | ||
| #define O_sp (O_gregs + 17*8) | ||
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| .section .rodata.str1.1,"aMS",@progbits,1 | ||
| .type longjmp_msg,@object | ||
| longjmp_msg: | ||
| .string "longjmp causes uninitialized stack frame" | ||
| .size longjmp_msg, .-longjmp_msg | ||
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| .text | ||
| ENTRY (____longjmp_chk) | ||
| ldx [%o0 + O_sp], %o2 | ||
| cmp %sp, %o2 | ||
| bleu,pt %xcc, .Lok | ||
| nop | ||
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| save %sp, -128, %sp | ||
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| #ifdef PIC | ||
| 1: call 2f | ||
| sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | ||
| 2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | ||
| add %l7, %o7, %l7 | ||
| #endif | ||
| sethi %hi(longjmp_msg), %o0 | ||
| or %o0, %lo(longjmp_msg), %o0 | ||
| #ifdef PIC | ||
| ldx [%l7 + %o0], %o0 | ||
| #endif | ||
| call HIDDEN_JUMPTARGET(__fortify_fail) | ||
| nop | ||
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| restore | ||
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| .Lok: | ||
| /* Modify the context with the value we want to return. */ | ||
| movre %o1, 1, %o1 | ||
| stx %o1, [%o0 + O_g1] | ||
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| /* Let setcontext know if we want to modify the current sigmask. */ | ||
| ld [%o0 + O_mask_was_saved], %o1 | ||
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| /* And bamf back to where we belong! */ | ||
| ta 0x6f | ||
| END(____longjmp_chk) |