| 1 | /* Install given context. |
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| 2 | Copyright (C) 2012-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | #include "ucontext_i.h" |
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| 22 | |
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| 23 | ENTRY(__setcontext) |
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| 24 | /* Load address of the context data structure. */ |
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| 25 | move.l 4(%sp), %a0 |
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| 26 | |
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| 27 | /* Get the current signal mask. Note that we preserve D2/D3 in case |
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| 28 | the system call fails and we return from the function with an |
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| 29 | error. */ |
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| 30 | move.l %d3, -(%sp) |
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| 31 | cfi_adjust_cfa_offset (4) |
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| 32 | cfi_rel_offset (%d3, 0) |
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| 33 | move.l %d2, -(%sp) |
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| 34 | cfi_adjust_cfa_offset (4) |
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| 35 | cfi_rel_offset (%d2, 0) |
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| 36 | clr.l %d3 |
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| 37 | lea oSIGMASK(%a0), %a1 |
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| 38 | move.l %a1, %d2 |
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| 39 | move.l #SIG_SETMASK, %d1 |
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| 40 | move.l #__NR_sigprocmask, %d0 |
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| 41 | trap #0 |
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| 42 | cmp.l #-4095, %d0 /* Check %d0 for error. */ |
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| 43 | jcs 0f |
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| 44 | move.l (%sp)+, %d2 |
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| 45 | cfi_adjust_cfa_offset (-4) |
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| 46 | cfi_restore (d2) |
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| 47 | move.l (%sp)+, %d3 |
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| 48 | cfi_adjust_cfa_offset (-4) |
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| 49 | cfi_restore (d3) |
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| 50 | jra SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ |
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| 51 | |
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| 52 | 0: /* Load the new stack pointer. */ |
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| 53 | move.l oSP(%a0), %sp |
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| 54 | cfi_def_cfa (%a0, 0) |
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| 55 | cfi_offset (%d2, oGREGS+2*4) |
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| 56 | cfi_offset (%d3, oGREGS+3*4) |
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| 57 | cfi_offset (%d4, oGREGS+4*4) |
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| 58 | cfi_offset (%d5, oGREGS+5*4) |
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| 59 | cfi_offset (%d6, oGREGS+6*4) |
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| 60 | cfi_offset (%d7, oGREGS+7*4) |
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| 61 | cfi_offset (%a2, oGREGS+10*4) |
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| 62 | cfi_offset (%a3, oGREGS+11*4) |
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| 63 | cfi_offset (%a4, oGREGS+12*4) |
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| 64 | cfi_offset (%a5, oGREGS+13*4) |
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| 65 | cfi_offset (%a6, oGREGS+14*4) |
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| 66 | cfi_offset (%fp2, oFP2+0*12) |
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| 67 | cfi_offset (%fp3, oFP2+1*12) |
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| 68 | cfi_offset (%fp4, oFP2+2*12) |
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| 69 | cfi_offset (%fp5, oFP2+3*12) |
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| 70 | cfi_offset (%fp6, oFP2+4*12) |
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| 71 | cfi_offset (%fp7, oFP2+5*12) |
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| 72 | cfi_offset (%pc, oPC) |
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| 73 | |
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| 74 | /* Load the values of all the preserved registers (except SP). */ |
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| 75 | movem.l oGREGS+2*4(%a0), %d2-%d7 |
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| 76 | movem.l oGREGS+10*4(%a0), %a2-%a6 |
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| 77 | fmovem.l oFPREGS(%a0), %fpsr/%fpcr/%fpiar |
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| 78 | fmovem.x oFP2(%a0), %fp2-%fp7 |
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| 79 | clr.l %d0 |
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| 80 | |
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| 81 | /* Fetch the address to return to. */ |
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| 82 | movl oPC(%a0), %a1 |
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| 83 | |
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| 84 | /* End FDE here, we fall into another context. */ |
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| 85 | cfi_endproc |
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| 86 | cfi_startproc |
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| 87 | cfi_register (%pc, %a1) |
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| 88 | |
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| 89 | jmp (%a1) |
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| 90 | |
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| 91 | cfi_offset (%pc, -4) |
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| 92 | PSEUDO_END(__setcontext) |
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| 93 | |
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| 94 | weak_alias (__setcontext, setcontext) |
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| 95 | |
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