projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 71483c00 | 1 | /* Save current context. |
| 0ecb606c | 2 | Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc. |
| 71483c00 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. | |
| 71483c00 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. |
| 71483c00 | 15 | |
| 41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, write to the Free | |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 19 | 02111-1307 USA. */ | |
| 71483c00 UD |
20 | |
| 21 | #include <sysdep.h> | |
| 22 | ||
| 23 | #include "ucontext_i.h" | |
| 24 | ||
| 25 | ||
| 26 | ENTRY(__getcontext) | |
| 27 | /* Load address of the context data structure. */ | |
| 28 | movl 4(%esp), %eax | |
| 29 | ||
| 30 | /* Return value of getcontext. EAX is the only register whose | |
| 31 | value is not preserved. */ | |
| 32 | movl $0, oEAX(%eax) | |
| 33 | ||
| 34 | /* Save the 32-bit register values and the return address. */ | |
| 35 | movl %ecx, oECX(%eax) | |
| 36 | movl %edx, oEDX(%eax) | |
| 37 | movl %edi, oEDI(%eax) | |
| 38 | movl %esi, oESI(%eax) | |
| 39 | movl %ebp, oEBP(%eax) | |
| 40 | movl (%esp), %ecx | |
| 41 | movl %ecx, oEIP(%eax) | |
| 42 | leal 4(%esp), %ecx /* Exclude the return address. */ | |
| 43 | movl %ecx, oESP(%eax) | |
| 44 | movl %ebx, oEBX(%eax) | |
| 45 | ||
| e14b1447 UD |
46 | /* Save the FS segment register. We don't touch the GS register |
| 47 | since it is used for threads. */ | |
| 71483c00 | 48 | xorl %edx, %edx |
| e14b1447 UD |
49 | movw %fs, %dx |
| 50 | movl %edx, oFS(%eax) | |
| 71483c00 UD |
51 | |
| 52 | /* We have separate floating-point register content memory on the | |
| 53 | stack. We use the __fpregs_mem block in the context. Set the | |
| 54 | links up correctly. */ | |
| 55 | leal oFPREGSMEM(%eax), %ecx | |
| 56 | movl %ecx, oFPREGS(%eax) | |
| 57 | /* Save the floating-point context. */ | |
| 58 | fnstenv (%ecx) | |
| 24176967 UD |
59 | /* And load it right back since the processor changes the mask. |
| 60 | Intel thought this opcode to be used in interrupt handlers which | |
| 61 | would block all exceptions. */ | |
| 62 | fldenv (%ecx) | |
| 71483c00 UD |
63 | |
| 64 | /* Save the current signal mask. */ | |
| 65 | pushl %ebx | |
| 0ecb606c JJ |
66 | cfi_adjust_cfa_offset (4) |
| 67 | cfi_rel_offset (ebx, 0) | |
| 71483c00 UD |
68 | leal oSIGMASK(%eax), %edx |
| 69 | xorl %ecx, %ecx | |
| 70 | movl $SIG_BLOCK, %ebx | |
| 71 | movl $__NR_sigprocmask, %eax | |
| 097eca29 | 72 | ENTER_KERNEL |
| 71483c00 | 73 | popl %ebx |
| 0ecb606c JJ |
74 | cfi_adjust_cfa_offset (-4) |
| 75 | cfi_restore (ebx) | |
| 71483c00 UD |
76 | cmpl $-4095, %eax /* Check %eax for error. */ |
| 77 | jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ | |
| 78 | ||
| 79 | /* All done, return 0 for success. */ | |
| 80 | xorl %eax, %eax | |
| 81 | L(pseudo_end): | |
| 82 | ret | |
| 83 | PSEUDO_END(__getcontext) | |
| 84 | ||
| 0ecb606c | 85 | weak_alias (__getcontext, getcontext) |