diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S new file mode 100644 index 0000000000..1539b40f01 --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S @@ -0,0 +1,149 @@ +/* Jump to a new context. + Copyright (C) 2002 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> + +#define __ASSEMBLY__ +#include <asm/ptrace.h> +#include "ucontext_i.h" + +ENTRY(__setcontext) + mflr r0 + stwu r1,-16(r1) + stw r0,20(r1) + stw r31,12(r1) + mr r31,r3 + + /* + * If this ucontext refers to the point where we were interrupted + * by a signal, we have to use the rt_sigreturn system call to + * return to the context so we get both LR and CTR restored. + * + * Otherwise, the context we are restoring is either just after + * a procedure call (getcontext/swapcontext) or at the beginning + * of a procedure call (makecontext), so we don't need to restore + * r0, xer, ctr. We don't restore r2 since it will be used as + * the TLS pointer. + */ + lwz r0,_UC_GREGS+(PT_MSR*4)(r31) + cmpwi r0,0 + bne L(do_sigret) + + /* Restore the signal mask */ + li r5,0 + addi r4,r3,_UC_SIGMASK + li r3,SIG_SETMASK + bl JUMPTARGET(sigprocmask) + cmpwi r3,0 + bne L(error_exit) + + /* Restore the floating-point registers */ + lfd fp31,_UC_FREGS+(32*8)(r31) + lfd fp0,_UC_FREGS+(0*8)(r31) + mtfsf 0xff,fp31 + lfd fp1,_UC_FREGS+(1*8)(r31) + lfd fp2,_UC_FREGS+(2*8)(r31) + lfd fp3,_UC_FREGS+(3*8)(r31) + lfd fp4,_UC_FREGS+(4*8)(r31) + lfd fp5,_UC_FREGS+(5*8)(r31) + lfd fp6,_UC_FREGS+(6*8)(r31) + lfd fp7,_UC_FREGS+(7*8)(r31) + lfd fp8,_UC_FREGS+(8*8)(r31) + lfd fp9,_UC_FREGS+(9*8)(r31) + lfd fp10,_UC_FREGS+(10*8)(r31) + lfd fp11,_UC_FREGS+(11*8)(r31) + lfd fp12,_UC_FREGS+(12*8)(r31) + lfd fp13,_UC_FREGS+(13*8)(r31) + lfd fp14,_UC_FREGS+(14*8)(r31) + lfd fp15,_UC_FREGS+(15*8)(r31) + lfd fp16,_UC_FREGS+(16*8)(r31) + lfd fp17,_UC_FREGS+(17*8)(r31) + lfd fp18,_UC_FREGS+(18*8)(r31) + lfd fp19,_UC_FREGS+(19*8)(r31) + lfd fp20,_UC_FREGS+(20*8)(r31) + lfd fp21,_UC_FREGS+(21*8)(r31) + lfd fp22,_UC_FREGS+(22*8)(r31) + lfd fp23,_UC_FREGS+(23*8)(r31) + lfd fp24,_UC_FREGS+(24*8)(r31) + lfd fp25,_UC_FREGS+(25*8)(r31) + lfd fp26,_UC_FREGS+(26*8)(r31) + lfd fp27,_UC_FREGS+(27*8)(r31) + lfd fp28,_UC_FREGS+(28*8)(r31) + lfd fp29,_UC_FREGS+(29*8)(r31) + lfd fp30,_UC_FREGS+(30*8)(r31) + lfd fp31,_UC_FREGS+(31*8)(r31) + + /* Restore LR and CCR, and set CTR to the NIP value */ + lwz r3,_UC_GREGS+(PT_LNK*4)(r31) + lwz r4,_UC_GREGS+(PT_NIP*4)(r31) + lwz r5,_UC_GREGS+(PT_CCR*4)(r31) + mtlr r3 + mtctr r4 + mtcr r5 + + /* Restore the general registers */ + lwz r1,_UC_GREGS+(PT_R1*4)(r31) + lwz r3,_UC_GREGS+(PT_R3*4)(r31) + lwz r4,_UC_GREGS+(PT_R4*4)(r31) + lwz r5,_UC_GREGS+(PT_R5*4)(r31) + lwz r6,_UC_GREGS+(PT_R6*4)(r31) + lwz r7,_UC_GREGS+(PT_R7*4)(r31) + lwz r8,_UC_GREGS+(PT_R8*4)(r31) + lwz r9,_UC_GREGS+(PT_R9*4)(r31) + lwz r10,_UC_GREGS+(PT_R10*4)(r31) + lwz r11,_UC_GREGS+(PT_R11*4)(r31) + lwz r12,_UC_GREGS+(PT_R12*4)(r31) + lwz r13,_UC_GREGS+(PT_R13*4)(r31) + lwz r14,_UC_GREGS+(PT_R14*4)(r31) + lwz r15,_UC_GREGS+(PT_R15*4)(r31) + lwz r16,_UC_GREGS+(PT_R16*4)(r31) + lwz r17,_UC_GREGS+(PT_R17*4)(r31) + lwz r18,_UC_GREGS+(PT_R18*4)(r31) + lwz r19,_UC_GREGS+(PT_R19*4)(r31) + lwz r20,_UC_GREGS+(PT_R20*4)(r31) + lwz r21,_UC_GREGS+(PT_R21*4)(r31) + lwz r22,_UC_GREGS+(PT_R22*4)(r31) + lwz r23,_UC_GREGS+(PT_R23*4)(r31) + lwz r24,_UC_GREGS+(PT_R24*4)(r31) + lwz r25,_UC_GREGS+(PT_R25*4)(r31) + lwz r26,_UC_GREGS+(PT_R26*4)(r31) + lwz r27,_UC_GREGS+(PT_R27*4)(r31) + lwz r28,_UC_GREGS+(PT_R28*4)(r31) + lwz r29,_UC_GREGS+(PT_R29*4)(r31) + lwz r30,_UC_GREGS+(PT_R30*4)(r31) + lwz r31,_UC_GREGS+(PT_R31*4)(r31) + + bctr + +L(error_exit): + lwz r31,12(r1) + lwz r0,20(r1) + addi r1,r1,16 + mtlr r0 + blr + +L(do_sigret): + addi r1,r3,-0xd0 + li r0,SYS_ify(rt_sigreturn) + sc + /* NOTREACHED */ + +PSEUDO_END(__setcontext) + +weak_alias(__setcontext, setcontext) |