| /* Save current context and install the given one. |
| Copyright (C) 2012-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| #include "ucontext_i.h" |
| |
| |
| ENTRY(__swapcontext) |
| /* Load address of the context data structure we save in. */ |
| move.l 4(%sp), %a0 |
| |
| /* Save the preserved registers and the return address. */ |
| movem.l %d2-%d7, oGREGS+2*4(%a0) |
| movem.l %a2-%a6, oGREGS+10*4(%a0) |
| lea 4(%sp), %a1 |
| move.l %a1, oSP(%a0) |
| move.l (%sp), oPC(%a0) |
| fmovem.l %fpsr/%fpcr/%fpiar, oFPREGS(%a0) |
| fmovem.x %fp2-%fp7, oFP2(%a0) |
| cfi_def_cfa (%a0, 0) |
| cfi_offset (%d2, oGREGS+2*4) |
| cfi_offset (%d3, oGREGS+3*4) |
| cfi_offset (%a2, oGREGS+10*4) |
| cfi_offset (%pc, oPC) |
| |
| /* Load address of the context data structure we have to load. */ |
| move.l 8(%sp), %a1 |
| |
| /* Save the current signal mask and install the new one. */ |
| lea oSIGMASK(%a0), %a2 |
| move.l %a2, %d3 |
| lea oSIGMASK(%a1), %a2 |
| move.l %a2, %d2 |
| move.l #SIG_SETMASK, %d1 |
| move.l #__NR_sigprocmask, %d0 |
| trap #0 |
| cmp.l #-4095, %d0 /* Check %d0 for error. */ |
| jcs 0f |
| /* Restore registers. */ |
| move.l oGREGS+2*4(%a0), %d2 |
| cfi_restore (%d2) |
| move.l oGREGS+3*4(%a0), %d3 |
| cfi_restore (%d3) |
| move.l oGREGS+10*4(%a0), %a2 |
| cfi_restore (%a2) |
| jra SYSCALL_ERROR_LABEL /* Jump to error handler. */ |
| |
| 0: /* Load the new stack pointer. */ |
| move.l oSP(%a1), %sp |
| cfi_def_cfa (%a1, 0) |
| cfi_offset (%d2, oGREGS+2*4) |
| cfi_offset (%d3, oGREGS+3*4) |
| cfi_offset (%d4, oGREGS+4*4) |
| cfi_offset (%d5, oGREGS+5*4) |
| cfi_offset (%d6, oGREGS+6*4) |
| cfi_offset (%d7, oGREGS+7*4) |
| cfi_offset (%a2, oGREGS+10*4) |
| cfi_offset (%a3, oGREGS+11*4) |
| cfi_offset (%a4, oGREGS+12*4) |
| cfi_offset (%a5, oGREGS+13*4) |
| cfi_offset (%a6, oGREGS+14*4) |
| cfi_offset (%fp2, oFP2+0*12) |
| cfi_offset (%fp3, oFP2+1*12) |
| cfi_offset (%fp4, oFP2+2*12) |
| cfi_offset (%fp5, oFP2+3*12) |
| cfi_offset (%fp6, oFP2+4*12) |
| cfi_offset (%fp7, oFP2+5*12) |
| cfi_offset (%pc, oPC) |
| |
| /* Load the values of all the preserved registers (except SP). */ |
| movem.l oGREGS+2*4(%a1), %d2-%d7 |
| movem.l oGREGS+10*4(%a1), %a2-%a6 |
| fmovem.l oFPREGS(%a1), %fpsr/%fpcr/%fpiar |
| fmovem.x oFP2(%a1), %fp2-%fp7 |
| |
| /* Clear D0 to indicate success. */ |
| clr.l %d0 |
| |
| /* Fetch the address to return to. */ |
| move.l oPC(%a1), %a0 |
| |
| /* End FDE here, we fall into another context. */ |
| cfi_endproc |
| cfi_startproc |
| cfi_register (%pc, %a0) |
| |
| jmp (%a0) |
| |
| cfi_offset (%pc, -4) |
| PSEUDO_END(__swapcontext) |
| |
| weak_alias (__swapcontext, swapcontext) |
