projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 4ee87ecc | 1 | /* Install given context. |
| b168057a | 2 | Copyright (C) 2001-2015 Free Software Foundation, Inc. |
| 4ee87ecc UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 4ee87ecc UD |
10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 4ee87ecc | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| 4ee87ecc UD |
19 | |
| 20 | #include <sysdep.h> | |
| 21 | ||
| 22 | #include "ucontext_i.h" | |
| 23 | ||
| 24 | ||
| 25 | ENTRY(__setcontext) | |
| 26 | /* Load address of the context data structure. */ | |
| 27 | movl 4(%esp), %eax | |
| 28 | ||
| 29 | /* Get the current signal mask. Note that we preserve EBX in case | |
| 30 | the system call fails and we return from the function with an | |
| 31 | error. */ | |
| 32 | pushl %ebx | |
| 1ad9da69 | 33 | cfi_adjust_cfa_offset (4) |
| 4ee87ecc UD |
34 | xorl %edx, %edx |
| 35 | leal oSIGMASK(%eax), %ecx | |
| 36 | movl $SIG_SETMASK, %ebx | |
| 1ad9da69 | 37 | cfi_rel_offset (ebx, 0) |
| 4ee87ecc | 38 | movl $__NR_sigprocmask, %eax |
| 097eca29 | 39 | ENTER_KERNEL |
| 4ee87ecc | 40 | popl %ebx |
| 1ad9da69 UD |
41 | cfi_adjust_cfa_offset (-4) |
| 42 | cfi_restore (ebx) | |
| 4ee87ecc UD |
43 | cmpl $-4095, %eax /* Check %eax for error. */ |
| 44 | jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ | |
| 45 | ||
| 46 | /* EAX was modified, reload it. */ | |
| 47 | movl 4(%esp), %eax | |
| 48 | ||
| 49 | /* Restore the floating-point context. Not the registers, only the | |
| 50 | rest. */ | |
| 51 | movl oFPREGS(%eax), %ecx | |
| 52 | fldenv (%ecx) | |
| 53 | ||
| e14b1447 UD |
54 | /* Restore the FS segment register. We don't touch the GS register |
| 55 | since it is used for threads. */ | |
| 4ee87ecc | 56 | movl oFS(%eax), %ecx |
| 4ee87ecc UD |
57 | movw %cx, %fs |
| 58 | ||
| a5392bed UD |
59 | /* Fetch the address to return to. */ |
| 60 | movl oEIP(%eax), %ecx | |
| 61 | ||
| 4ee87ecc | 62 | /* Load the new stack pointer. */ |
| fee732e5 UD |
63 | cfi_def_cfa (eax, 0) |
| 64 | cfi_offset (edi, oEDI) | |
| 65 | cfi_offset (esi, oESI) | |
| 66 | cfi_offset (ebp, oEBP) | |
| 67 | cfi_offset (ebx, oEBX) | |
| 68 | cfi_offset (edx, oEDX) | |
| 69 | cfi_offset (ecx, oECX) | |
| a5392bed UD |
70 | movl oESP(%eax), %esp |
| 71 | ||
| 72 | /* Push the return address on the new stack so we can return there. */ | |
| 73 | pushl %ecx | |
| 74 | ||
| 75 | /* Load the values of all the 32-bit registers (except ESP). | |
| 76 | Since we are loading from EAX, it must be last. */ | |
| 77 | movl oEDI(%eax), %edi | |
| 78 | movl oESI(%eax), %esi | |
| 79 | movl oEBP(%eax), %ebp | |
| 80 | movl oEBX(%eax), %ebx | |
| 81 | movl oEDX(%eax), %edx | |
| 82 | movl oECX(%eax), %ecx | |
| 83 | movl oEAX(%eax), %eax | |
| 84 | ||
| fee732e5 UD |
85 | /* End FDE here, we fall into another context. */ |
| 86 | cfi_endproc | |
| 87 | cfi_startproc | |
| 88 | ||
| a5392bed | 89 | /* The following 'ret' will pop the address of the code and jump |
| 4ee87ecc UD |
90 | to it. */ |
| 91 | ||
| 4ee87ecc UD |
92 | ret |
| 93 | PSEUDO_END(__setcontext) | |
| 94 | ||
| 1ab18a5b | 95 | weak_alias (__setcontext, setcontext) |