diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S new file mode 100644 index 0000000000..d503cbbf3e --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S @@ -0,0 +1,162 @@ +/* Switch to 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 + std r31,-8(1) + std r0,FRAME_LR_SAVE(r1) + stdu r1,-128(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 + * msr and ctr. We don't restore r13 since it will be used as + * the TLS pointer. */ + lwz r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31) + cmpdi r0,0 + bne L(do_sigret) + + li r5,0 + addi r4,r3,UCONTEXT_SIGMASK + li r3,SIG_SETMASK + bl .sigprocmask + nop + cmpdi r3,0 + bne L(error_exit) + + lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31) + lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r31) + lfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r31) + mtfsf 0xff,fp0 + lfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r31) + lfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r31) + lfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r31) + lfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r31) + lfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r31) + lfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r31) + lfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r31) + lfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r31) + lfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r31) + lfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r31) + lfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r31) + lfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r31) + lfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r31) + lfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r31) + lfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r31) + lfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r31) + lfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r31) + lfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r31) + lfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r31) + lfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r31) + lfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r31) + lfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r31) + lfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r31) + lfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r31) + lfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r31) + lfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r31) + lfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r31) + lfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r31) + lfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r31) + lfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r31) + + ld r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r31) + ld r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r31) + mtlr r0 + ld r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r31) + ld r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r31) + ld r3,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r31) + mtxer r0 + ld r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r31) + ld r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r31) + ld r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r31) + mfcr r0 + ld r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r31) + ld r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r31) + ld r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r31) + ld r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r31) + ld r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r31) + ld r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r31) + ld r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r31) + /* Don't reload the thread ID or TLS pointer (r13). */ + ld r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r31) + ld r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r31) + ld r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r31) + ld r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r31) + ld r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r31) + ld r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r31) + ld r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r31) + ld r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r31) + ld r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r31) + ld r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r31) + ld r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r31) + ld r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r31) + ld r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r31) + ld r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r31) + ld r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r31) + ld r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r31) + ld r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r31) + + /* Now we branch to the "Next Instruction Pointer" from the saved + context. With the powerpc64 instruction set there is no good way to + do this (from user state) without clobbering either the LR or CTR. + The makecontext and swapcontext functions depend on the callers + LR being preserved so we use the CTR. */ + ld r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r31) + mtctr r0 + ld r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r31) + ld r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r31) + bctr + +L(error_exit): + ld r0,128+FRAME_LR_SAVE(r1) + addi r1,r1,128 + mtlr r0 + ld r31,-8(r1) + blr + + /* At this point we assume that the ucontext was created by a + rt_signal and we should use rt_sigreturn to restore the original + state. As of the 2.4.21 kernel the ucontext is the first thing + (offset 0) in the rt_signal frame and rt_sigreturn expects the + ucontext address in R1. Normally the rt-signal trampoline handles + this by popping dummy frame before the rt_signal syscall. In our + case the stack may not be in its original (signal handler return with + R1 pointing at the dummy frame) state. We do have the ucontext + address in R3, so simply copy R3 to R1 before the syscall. */ +L(do_sigret): + mr r1,r3, + li r0,SYS_ify(rt_sigreturn) + sc + /* No return. */ + +PSEUDO_END(__setcontext) + +weak_alias(__setcontext, setcontext) |