| 1 | /* Copyright (C) 2009-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* longjmp is implemented in terms of the setcontext trap on Linux/Sparc64. */ |
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| 19 | |
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| 20 | #include <sysdep.h> |
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| 21 | |
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| 22 | /* Offsets into the jmp_buf structure. */ |
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| 23 | |
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| 24 | #define O_mask_was_saved 512 |
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| 25 | #define O_gregs 32 |
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| 26 | #define O_g1 (O_gregs + 4*8) |
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| 27 | #define O_sp (O_gregs + 17*8) |
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| 28 | |
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| 29 | .section .rodata.str1.1,"aMS" ,@progbits,1 |
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| 30 | .type longjmp_msg,@object |
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| 31 | longjmp_msg: |
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| 32 | .string "longjmp causes uninitialized stack frame" |
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| 33 | .size longjmp_msg, .-longjmp_msg |
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| 34 | |
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| 35 | .text |
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| 36 | ENTRY (____longjmp_chk) |
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| 37 | ldx [%o0 + O_sp], %o2 |
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| 38 | cmp %sp, %o2 |
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| 39 | bleu,pt %xcc, .Lok |
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| 40 | nop |
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| 41 | |
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| 42 | save %sp, -208, %sp |
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| 43 | cfi_remember_state |
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| 44 | cfi_def_cfa_register(%fp) |
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| 45 | cfi_window_save |
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| 46 | cfi_register(%o7, %i7) |
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| 47 | add %fp, 2023, %o1 |
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| 48 | clr %o0 |
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| 49 | LOADSYSCALL(sigaltstack) |
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| 50 | ta 0x6d |
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| 51 | bcs,pn %xcc, .Lok2 |
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| 52 | lduw [%fp + 2031], %l2 |
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| 53 | andcc %l2, 0x1, %g0 |
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| 54 | be,pn %xcc, .Lfail |
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| 55 | ldx [%fp + 2023], %l0 |
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| 56 | ldx [%fp + 2039], %l1 |
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| 57 | sub %l0, STACK_BIAS, %l0 |
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| 58 | add %l0, %l1, %l0 |
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| 59 | sub %l0, %i2, %l0 |
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| 60 | cmp %l0, %l1 |
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| 61 | bgeu,pt %xcc, .Lok2 |
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| 62 | nop |
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| 63 | |
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| 64 | .Lfail: |
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| 65 | #ifndef PIC |
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| 66 | sethi %hi(longjmp_msg), %o0 |
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| 67 | or %o0, %lo(longjmp_msg), %o0 |
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| 68 | #else |
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| 69 | SETUP_PIC_REG(l7) |
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| 70 | sethi %gdop_hix22(longjmp_msg), %o0 |
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| 71 | xor %o0, %gdop_lox10(longjmp_msg), %o0 |
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| 72 | ldx [%l7 + %o0], %o0, %gdop(longjmp_msg) |
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| 73 | #endif |
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| 74 | call HIDDEN_JUMPTARGET(__fortify_fail) |
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| 75 | nop |
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| 76 | |
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| 77 | .Lok2: restore |
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| 78 | cfi_restore_state |
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| 79 | |
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| 80 | .Lok: |
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| 81 | /* Modify the context with the value we want to return. */ |
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| 82 | movre %o1, 1, %o1 |
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| 83 | stx %o1, [%o0 + O_g1] |
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| 84 | |
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| 85 | /* Let setcontext know if we want to modify the current sigmask. */ |
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| 86 | ld [%o0 + O_mask_was_saved], %o1 |
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| 87 | |
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| 88 | /* And bamf back to where we belong! */ |
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| 89 | ta 0x6f |
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| 90 | END(____longjmp_chk) |
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| 91 | |
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