diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S | 334 |
1 files changed, 167 insertions, 167 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S index ab6a6254f9..8e2cc71b0a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S @@ -73,12 +73,12 @@ ENTRY(__novec_swapcontext) std r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r3) mfcr r0 std r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r3) - - /* Set the return value of swapcontext to "success". R3 is the only + + /* Set the return value of swapcontext to "success". R3 is the only register whose value is not preserved in the saved context. */ li r0,0 std r0,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r3) - + /* Zero fill fields that can't be set in user state or are unused. */ std r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(34*8))(r3) @@ -87,14 +87,14 @@ ENTRY(__novec_swapcontext) std r0,(SIGCONTEXT_GP_REGS+(41*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(42*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(PT_RESULT*8))(r3) - - /* Set the PT_REGS pointer to the address of sigcontext gp_regs - field. Struct pt_regs and elf_gregset_t are the same thing. + + /* Set the PT_REGS pointer to the address of sigcontext gp_regs + field. Struct pt_regs and elf_gregset_t are the same thing. We kept the regs field for backwards compatibility with libraries built before we extended sigcontext. */ addi r0,r3,SIGCONTEXT_GP_REGS std r0,SIGCONTEXT_PT_REGS(r3) - + stfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r3) stfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r3) stfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r3) @@ -154,41 +154,41 @@ ENTRY(__novec_swapcontext) bne L(nv_do_sigret) lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31) - lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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) @@ -224,33 +224,33 @@ ENTRY(__novec_swapcontext) 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 + 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 + 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(nv_error_exit): - ld r0,128+FRAME_LR_SAVE(r1) + 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 + /* 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(nv_do_sigret): mr r1,r3, @@ -266,11 +266,11 @@ L(nv_do_sigret): bl JUMPTARGET(__syscall_error) nop li r3,-1 - ld r0,128+FRAME_LR_SAVE(r1) + ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 blr -#endif +#endif PSEUDO_END(__novec_swapcontext) @@ -281,12 +281,12 @@ compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3) .section ".toc","aw" .LC__dl_hwcap: #ifdef SHARED - .tc _rtld_global[TC],_rtld_global + .tc _rtld_global_ro[TC],_rtld_global_ro #else .tc _dl_hwcap[TC],_dl_hwcap #endif .section ".text" - + ENTRY(__swapcontext) #ifdef __ASSUME_NEW_RT_SIGRETURN_SYSCALL std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3) @@ -332,12 +332,12 @@ ENTRY(__swapcontext) std r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r3) mfcr r0 std r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r3) - - /* Set the return value of swapcontext to "success". R3 is the only + + /* Set the return value of swapcontext to "success". R3 is the only register whose value is not preserved in the saved context. */ li r0,0 std r0,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r3) - + /* Zero fill fields that can't be set in user state or are unused. */ std r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(34*8))(r3) @@ -346,14 +346,14 @@ ENTRY(__swapcontext) std r0,(SIGCONTEXT_GP_REGS+(41*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(42*8))(r3) std r0,(SIGCONTEXT_GP_REGS+(PT_RESULT*8))(r3) - - /* Set the PT_REGS pointer to the address of sigcontext gp_regs - field. Struct pt_regs and elf_gregset_t are the same thing. + + /* Set the PT_REGS pointer to the address of sigcontext gp_regs + field. Struct pt_regs and elf_gregset_t are the same thing. We kept the regs field for backwards compatibility with libraries built before we extended sigcontext. */ addi r0,r3,SIGCONTEXT_GP_REGS std r0,SIGCONTEXT_PT_REGS(r3) - + stfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r3) stfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r3) stfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r3) @@ -388,115 +388,115 @@ ENTRY(__swapcontext) stfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r3) stfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r3) stfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r3) - + ld r8,.LC__dl_hwcap@toc(r2) li r10,0 -#ifdef SHARED +#ifdef SHARED /* Load _rtld-global._dl_hwcap. */ - ld r8,RTLD_GLOBAL_DL_HWCAP_OFFSET(r8) -#else + ld r8,RTLD_GLOBAL_DL_HWCAP_OFFSET(r8) +#else ld r8,0(r8) /* Load extern _dl_hwcap. */ #endif andis. r8,r8,(PPC_FEATURE_HAS_ALTIVEC >> 16) beq L(has_no_vec) - + la r10,(SIGCONTEXT_V_RESERVE+8)(r3) la r9,(SIGCONTEXT_V_RESERVE+24)(r3) clrrdi r10,r10,4 clrrdi r9,r9,4 - - stvx v0,0,r10 + + stvx v0,0,r10 stvx v1,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v2,0,r10 + + stvx v2,0,r10 stvx v3,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v4,0,r10 + + stvx v4,0,r10 stvx v5,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v6,0,r10 + + stvx v6,0,r10 stvx v7,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v8,0,r10 + + stvx v8,0,r10 stvx v9,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v10,0,r10 + + stvx v10,0,r10 stvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v12,0,r10 + + stvx v12,0,r10 stvx v13,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v14,0,r10 + + stvx v14,0,r10 stvx v15,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v16,0,r10 + + stvx v16,0,r10 stvx v17,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v18,0,r10 + + stvx v18,0,r10 stvx v11,0,r9 addi r19,r10,32 addi r9,r9,32 - - stvx v20,0,r10 + + stvx v20,0,r10 stvx v21,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v22,0,r10 + + stvx v22,0,r10 stvx v23,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v24,0,r10 + + stvx v24,0,r10 stvx v25,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v26,0,r10 + + stvx v26,0,r10 stvx v27,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v28,0,r10 + + stvx v28,0,r10 stvx v29,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v30,0,r10 + + stvx v30,0,r10 stvx v31,0,r9 addi r10,r10,32 addi r9,r9,32 - - stvx v10,0,r10 + + stvx v10,0,r10 stvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 - + mfvscr v0 mfspr r0,VRSAVE stvx v0,0,r10 stw r0,0(9) - + L(has_no_vec): -/* +/* Store either a NULL or a quadword aligned pointer to the Vector register array into *v_regs. */ @@ -524,154 +524,154 @@ L(has_no_vec): lwz r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31) cmpdi r0,0 bne L(do_sigret) - + ld r8,.LC__dl_hwcap@toc(r2) ld r10,(SIGCONTEXT_V_REGS_PTR)(r31) -#ifdef SHARED +#ifdef SHARED /* Load _rtld-global._dl_hwcap. */ - ld r8,RTLD_GLOBAL_DL_HWCAP_OFFSET(r8) -#else + ld r8,RTLD_GLOBAL_DL_HWCAP_OFFSET(r8) +#else ld r8,0(r8) /* Load extern _dl_hwcap. */ #endif andis. r8,r8,(PPC_FEATURE_HAS_ALTIVEC >> 16) beq L(has_no_vec2) - + cmpdi r10,0 beq L(has_no_vec2) lwz r0,(33*16)(r10) - + li r9,(16*32) mtspr VRSAVE,r0 cmpwi r0,0 - beq L(has_no_vec2) - + beq L(has_no_vec2) + lvx v19,r9,r10 la r9,(16)(r10) - - lvx v0,0,r10 + + lvx v0,0,r10 lvx v1,0,r9 addi r10,r10,32 addi r9,r9,32 - + mtvscr v19 - lvx v2,0,r10 + lvx v2,0,r10 lvx v3,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v4,0,r10 + + lvx v4,0,r10 lvx v5,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v6,0,r10 + + lvx v6,0,r10 lvx v7,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v8,0,r10 + + lvx v8,0,r10 lvx v9,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v10,0,r10 + + lvx v10,0,r10 lvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v12,0,r10 + + lvx v12,0,r10 lvx v13,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v14,0,r10 + + lvx v14,0,r10 lvx v15,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v16,0,r10 + + lvx v16,0,r10 lvx v17,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v18,0,r10 + + lvx v18,0,r10 lvx v11,0,r9 addi r19,r10,32 addi r9,r9,32 - - lvx v20,0,r10 + + lvx v20,0,r10 lvx v21,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v22,0,r10 + + lvx v22,0,r10 lvx v23,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v24,0,r10 + + lvx v24,0,r10 lvx v25,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v26,0,r10 + + lvx v26,0,r10 lvx v27,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v28,0,r10 + + lvx v28,0,r10 lvx v29,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v30,0,r10 + + lvx v30,0,r10 lvx v31,0,r9 addi r10,r10,32 addi r9,r9,32 - - lvx v10,0,r10 + + lvx v10,0,r10 lvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 - + L(has_no_vec2): lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31) - lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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) @@ -707,33 +707,33 @@ L(has_no_vec2): 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 + 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 + 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) + 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 + /* 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, @@ -749,11 +749,11 @@ L(do_sigret): bl JUMPTARGET(__syscall_error) nop li r3,-1 - ld r0,128+FRAME_LR_SAVE(r1) + ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 blr -#endif +#endif PSEUDO_END(__swapcontext) |