/* Switch to context. Copyright (C) 2002-2020 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 . */ #include #include #include #define __ASSEMBLY__ #include #include "ucontext_i.h" #include .section ".toc","aw" .LC__dl_hwcap: #ifdef SHARED .tc _rtld_global_ro[TC],_rtld_global_ro #else .tc _dl_hwcap[TC],_dl_hwcap #endif .section ".text" #if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4) ENTRY(__novec_setcontext) CALL_MCOUNT 1 mflr r0 std r31,-8(1) cfi_offset(r31,-8) std r0,FRAME_LR_SAVE(r1) cfi_offset (lr, FRAME_LR_SAVE) stdu r1,-128(r1) cfi_adjust_cfa_offset (128) mr r31,r3 li r5,0 addi r4,r3,UCONTEXT_SIGMASK li r3,SIG_SETMASK bl JUMPTARGET(__sigprocmask) nop cmpdi r3,0 bne L(nv_error_exit) # ifdef SHARED /* Load _rtld-global._dl_hwcap. */ ld r5,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r5) # else ld r5,0(r5) /* Load extern _dl_hwcap. */ # endif 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) # ifdef _ARCH_PWR6 /* Use the extended four-operand version of the mtfsf insn. */ .machine push .machine "power6" mtfsf 0xff,fp0,1,0 .machine pop # else /* Availability of DFP indicates a 64-bit FPSCR. */ andi. r6,r5,PPC_FEATURE_HAS_DFP beq 5f /* Use the extended four-operand version of the mtfsf insn. */ .machine push .machine "power6" mtfsf 0xff,fp0,1,0 .machine pop b 6f /* Continue to operate on the FPSCR as if it were 32-bits. */ 5: mtfsf 0xff,fp0 6: # endif /* _ARCH_PWR6 */ 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) /* End FDE now, because the unwind info would be wrong while we're reloading registers to switch to the new context. */ cfi_endproc 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) mtcr 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 /* Re-establish FDE for the rest of the actual setcontext routine. */ cfi_startproc cfi_offset (lr, FRAME_LR_SAVE) cfi_adjust_cfa_offset (128) L(nv_error_exit): ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 ld r31,-8(r1) blr PSEUDO_END(__novec_setcontext) compat_symbol (libc, __novec_setcontext, setcontext, GLIBC_2_3) #endif .section ".text" .machine "altivec" ENTRY(__setcontext) CALL_MCOUNT 1 mflr r0 std r31,-8(1) cfi_offset(r31,-8) std r0,FRAME_LR_SAVE(r1) cfi_offset (lr, FRAME_LR_SAVE) stdu r1,-128(r1) cfi_adjust_cfa_offset (128) mr r31,r3 li r5,0 addi r4,r3,UCONTEXT_SIGMASK li r3,SIG_SETMASK bl JUMPTARGET(__sigprocmask) nop cmpdi r3,0 bne L(error_exit) ld r5,.LC__dl_hwcap@toc(r2) ld r10,(SIGCONTEXT_V_REGS_PTR)(r31) # ifdef SHARED /* Load _rtld-global._dl_hwcap. */ ld r5,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r5) # else ld r5,0(r5) /* Load extern _dl_hwcap. */ # endif andis. r6,r5,(PPC_FEATURE_HAS_ALTIVEC >> 16) beq L(has_no_vec) cmpdi r10,0 beq L(has_no_vec) lwz r0,(33*16)(r10) li r9,(16*32) mtspr VRSAVE,r0 cmpwi r0,0 beq L(has_no_vec) lvx v19,r9,r10 la r9,(16)(r10) lvx v0,0,r10 lvx v1,0,r9 addi r10,r10,32 addi r9,r9,32 mtvscr v19 lvx v2,0,r10 lvx v3,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v4,0,r10 lvx v5,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v6,0,r10 lvx v7,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v8,0,r10 lvx v9,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v10,0,r10 lvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v12,0,r10 lvx v13,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v14,0,r10 lvx v15,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v16,0,r10 lvx v17,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v18,0,r10 lvx v19,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v20,0,r10 lvx v21,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v22,0,r10 lvx v23,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v24,0,r10 lvx v25,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v26,0,r10 lvx v27,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v28,0,r10 lvx v29,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v30,0,r10 lvx v31,0,r9 addi r10,r10,32 addi r9,r9,32 lvx v10,0,r10 lvx v11,0,r9 addi r10,r10,32 addi r9,r9,32 L(has_no_vec): 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) # ifdef _ARCH_PWR6 /* Use the extended four-operand version of the mtfsf insn. */ .machine push .machine "power6" mtfsf 0xff,fp0,1,0 .machine pop # else /* Availability of DFP indicates a 64-bit FPSCR. */ andi. r6,r5,PPC_FEATURE_HAS_DFP beq 7f /* Use the extended four-operand version of the mtfsf insn. */ .machine push .machine "power6" mtfsf 0xff,fp0,1,0 .machine pop b 8f /* Continue to operate on the FPSCR as if it were 32-bits. */ 7: mtfsf 0xff,fp0 8: # endif /* _ARCH_PWR6 */ 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) /* End FDE now, because the unwind info would be wrong while we're reloading registers to switch to the new context. */ cfi_endproc 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) 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) mtcr r0 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 /* Re-establish FDE for the rest of the actual setcontext routine. */ cfi_startproc cfi_offset (lr, FRAME_LR_SAVE) cfi_adjust_cfa_offset (128) L(error_exit): ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 ld r31,-8(r1) blr PSEUDO_END(__setcontext) versioned_symbol (libc, __setcontext, setcontext, GLIBC_2_3_4)