diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sh/sh3/swapcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sh/sh3/swapcontext.S | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sh/sh3/swapcontext.S b/sysdeps/unix/sysv/linux/sh/sh3/swapcontext.S new file mode 100644 index 0000000000..64035e5545 --- /dev/null +++ b/sysdeps/unix/sysv/linux/sh/sh3/swapcontext.S @@ -0,0 +1,132 @@ +/* Save current context and install the given one. + Copyright (C) 2005 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + +#include "ucontext_i.h" + +/* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */ + + .text + .align 5 +ENTRY(__swapcontext) + + /* Return value of getcontext. R0 is the only register whose + value is not preserved. */ + mov #0, r0 + mov.l r0, @(oR0,r4) + mov.l r1, @(oR1,r4) + mov.l r2, @(oR2,r4) + mov.l r3, @(oR3,r4) + mov.l r4, @(oR4,r4) + mov.l r5, @(oR5,r4) + mov.l r6, @(oR6,r4) + mov.l r7, @(oR7,r4) + mov r4, r0 + add #(oMACL+4), r0 + sts.l macl, @-r0 + sts.l mach, @-r0 + stc.l gbr, @-r0 + + /* Save T flag to SR. */ + movt r1 + mov.l r1, @-r0 + sts.l pr, @-r0 + + /* The return address of getcontext is the restart pc. */ + sts.l pr, @-r0 + + mov.l r15, @-r0 + mov.l r14, @-r0 + mov.l r13, @-r0 + mov.l r12, @-r0 + mov.l r11, @-r0 + mov.l r10, @-r0 + mov.l r9, @-r0 + mov.l r8, @-r0 + + mov r5, r8 + + /* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask). */ + add #oSIGMASK, r5 + mov r4, r6 + add #oSIGMASK, r6 + mov #SIG_SETMASK, r4 + mov #+SYS_ify(sigprocmask), r3 + trapa #0x13 + mov r0, r1 + mov #-12, r2 + shad r2, r1 + not r1, r1 // r1=0 means r0 = -1 to -4095 + tst r1, r1 // i.e. error in linux + bf .Lswapcontext_restore +.Lsyscall_error: + SYSCALL_ERROR_HANDLER +.Lpseudo_end: + rts + nop +.Lswapcontext_restore: + mov r8, r0 + add #(oPC), r0 + mov.l @r0+, r2 + lds.l @r0+, pr + + /* Restore T frag. */ + mov.l @r0+, r1 + shlr r1 + /* Skip GBR which is used for thread pointer. */ + add #4, r0 + + lds.l @r0+, mach + lds.l @r0+, macl + + mov r8, r0 + add #(oR9), r0 + mov.l @r0+, r9 + mov.l @r0+, r10 + mov.l @r0+, r11 + mov.l @r0+, r12 + mov.l @r0+, r13 + mov.l @r0+, r14 + mov.l @r0+, r15 + + mov r8, r0 + mov.l @(oR0,r0), r1 + mov.l r1, @-r15 + cfi_adjust_cfa_offset(4) + cfi_rel_offset (r1, 0) + mov.l r2, @-r15 + cfi_adjust_cfa_offset(4) + cfi_rel_offset (r2, 0) + + mov.l @(oR1,r0), r1 + mov.l @(oR2,r0), r2 + mov.l @(oR3,r0), r3 + mov.l @(oR4,r0), r4 + mov.l @(oR5,r0), r5 + mov.l @(oR6,r0), r6 + mov.l @(oR7,r0), r7 + mov.l @(oR8,r0), r8 + mov.l @r15+, r0 + jmp @r0 + mov.l @r15+, r0 + +PSEUDO_END(__swapcontext) + +weak_alias (__swapcontext, swapcontext) |