projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a0902db9 DM |
1 | /* Copyright (C) 2009 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| 15 | License along with the GNU C Library; if not, write to the Free | |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 17 | 02111-1307 USA. */ | |
| 18 | ||
| 19 | #include <sysdep.h> | |
| 20 | #include <jmpbuf-offsets.h> | |
| 21 | ||
| 22 | #define ENV(base,reg) [%base + (reg * 4)] | |
| 23 | #define ST_FLUSH_WINDOWS 3 | |
| 24 | #define RW_FP [%fp + 0x48] | |
| 25 | ||
| 26 | .section .rodata.str1.1,"aMS",@progbits,1 | |
| 27 | .type longjmp_msg,@object | |
| 28 | longjmp_msg: | |
| 29 | .string "longjmp causes uninitialized stack frame" | |
| 30 | .size longjmp_msg, .-longjmp_msg | |
| 31 | ||
| 32 | .text | |
| 33 | ENTRY (____longjmp_chk) | |
| 34 | ld ENV(o0,JB_SP), %g5 | |
| 35 | #ifdef PTR_DEMANGLE | |
| 36 | PTR_DEMANGLE (%g5, %g5, %g4) | |
| 37 | #endif | |
| 38 | ||
| 39 | cmp %sp, %g5 | |
| 40 | bleu .Lok_norestore | |
| 41 | nop | |
| 42 | ||
| 43 | save %sp, -80, %sp | |
| 44 | ||
| 45 | clr %o0 | |
| 46 | add %sp, 64, %o1 | |
| 47 | set __NR_sigaltstack, %g1 | |
| 48 | ta 0x10 | |
| 49 | bcs .Lok | |
| 50 | ld [%sp + 64 + 4], %o2 | |
| 51 | andcc %o2, 0x1, %g0 | |
| 52 | be .Lfail | |
| 53 | ld [%sp + 64 + 0], %o0 | |
| 54 | ||
| 55 | ld [%sp + 64 + 8], %o1 | |
| 56 | add %o0, %o1, %o0 | |
| 57 | sub %o0, %g3, %o0 | |
| 58 | cmp %o1, %o0 | |
| 59 | bgeu .Lok | |
| 60 | nop | |
| 61 | ||
| 62 | .Lfail: | |
| 63 | #ifdef PIC | |
| 64 | 1: call 2f | |
| 65 | sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | |
| 66 | 2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 | |
| 67 | add %l7, %o7, %l7 | |
| 68 | #endif | |
| 69 | sethi %hi(longjmp_msg), %o0 | |
| 70 | or %o0, %lo(longjmp_msg), %o0 | |
| 71 | #ifdef PIC | |
| 72 | ld [%l7 + %o0], %o0 | |
| 73 | #endif | |
| 74 | call HIDDEN_JUMPTARGET(__fortify_fail) | |
| 75 | nop | |
| 76 | ||
| 77 | .Lok: | |
| 78 | restore | |
| 79 | ||
| 80 | .Lok_norestore: | |
| 81 | ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ | |
| 82 | #ifdef PTR_DEMANGLE | |
| 83 | PTR_DEMANGLE2 (%g3, %g3, %g4) | |
| 84 | #endif | |
| 85 | ||
| 86 | mov %o0, %g1 /* ENV in %g1 */ | |
| 87 | orcc %o1, %g0, %g2 /* VAL in %g2 */ | |
| 88 | be,a 0f /* Branch if zero; else skip delay slot. */ | |
| 89 | mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ | |
| 90 | 0: | |
| 91 | ||
| 92 | /* | |
| 93 | * Do a "flush register windows trap". The trap handler in the | |
| 94 | * kernel writes all the register windows to their stack slots, and | |
| 95 | * marks them all as invalid (needing to be sucked up from the | |
| 96 | * stack when used). This ensures that all information needed to | |
| 97 | * unwind to these callers is in memory, not in the register | |
| 98 | * windows. | |
| 99 | */ | |
| 100 | ta ST_FLUSH_WINDOWS | |
| 101 | #ifdef PTR_DEMANGLE | |
| 102 | ld ENV(g1,JB_PC), %g1 /* Set return PC. */ | |
| 103 | PTR_DEMANGLE2 (%o7, %g1, %g4) | |
| 104 | #else | |
| 105 | ld ENV(g1,JB_PC), %o7 /* Set return PC. */ | |
| 106 | #endif | |
| 107 | mov %g5, %fp | |
| 108 | sub %fp, 64, %sp /* Allocate a register frame. */ | |
| 109 | st %g3, RW_FP /* Set saved FP on restore below. */ | |
| 110 | retl | |
| 111 | restore %g2, 0, %o0 /* Restore values from above register frame. */ | |
| 112 | ||
| 113 | END(____longjmp_chk) |