diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k/m680x0/swapcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/m68k/m680x0/swapcontext.S | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/swapcontext.S b/sysdeps/unix/sysv/linux/m68k/m680x0/swapcontext.S new file mode 100644 index 0000000000..e7a73944b7 --- /dev/null +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/swapcontext.S @@ -0,0 +1,108 @@ +/* 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) |