1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright 2015, Cyril Bur, IBM Corp. 4 */ 5 6 #include "basic_asm.h" 7 #include "gpr_asm.h" 8 #include "fpu_asm.h" 9 #include "vmx_asm.h" 10 #include "vsx_asm.h" 11 12 /* 13 * Large caveat here being that the caller cannot expect the 14 * signal to always be sent! The hardware can (AND WILL!) abort 15 * the transaction between the tbegin and the tsuspend (however 16 * unlikely it seems or infrequently it actually happens). 17 * You have been warned. 18 */ 19 /* long tm_signal_self(pid_t pid, long *gprs, double *fps, vector *vms, vector *vss); */ 20 FUNC_START(tm_signal_self_context_load) 21 PUSH_BASIC_STACK(512) 22 /* 23 * Don't strictly need to save and restore as it depends on if 24 * we're going to use them, however this reduces messy logic 25 */ 26 PUSH_VMX(STACK_FRAME_LOCAL(5,0),r8) 27 PUSH_FPU(512) 28 PUSH_NVREGS_BELOW_FPU(512) 29 std r3, STACK_FRAME_PARAM(0)(sp) /* pid */ 30 std r4, STACK_FRAME_PARAM(1)(sp) /* gps */ 31 std r5, STACK_FRAME_PARAM(2)(sp) /* fps */ 32 std r6, STACK_FRAME_PARAM(3)(sp) /* vms */ 33 std r7, STACK_FRAME_PARAM(4)(sp) /* vss */ 34 35 ld r3, STACK_FRAME_PARAM(1)(sp) 36 cmpdi r3, 0 37 beq skip_gpr_lc 38 bl load_gpr 39 skip_gpr_lc: 40 ld r3, STACK_FRAME_PARAM(2)(sp) 41 cmpdi r3, 0 42 beq skip_fpu_lc 43 bl load_fpu 44 skip_fpu_lc: 45 ld r3, STACK_FRAME_PARAM(3)(sp) 46 cmpdi r3, 0 47 beq skip_vmx_lc 48 bl load_vmx 49 skip_vmx_lc: 50 ld r3, STACK_FRAME_PARAM(4)(sp) 51 cmpdi r3, 0 52 beq skip_vsx_lc 53 bl load_vsx 54 skip_vsx_lc: 55 /* 56 * Set r3 (return value) before tbegin. Use the pid as a known 57 * 'all good' return value, zero is used to indicate a non-doomed 58 * transaction. 59 */ 60 ld r3, STACK_FRAME_PARAM(0)(sp) 61 tbegin. 62 beq 1f 63 tsuspend. /* Can't enter a syscall transactionally */ 64 ld r3, STACK_FRAME_PARAM(1)(sp) 65 cmpdi r3, 0 66 beq skip_gpr_lt 67 /* Get the second half of the array */ 68 addi r3, r3, 8 * 18 69 bl load_gpr 70 skip_gpr_lt: 71 ld r3, STACK_FRAME_PARAM(2)(sp) 72 cmpdi r3, 0 73 beq skip_fpu_lt 74 /* Get the second half of the array */ 75 addi r3, r3, 8 * 18 76 bl load_fpu 77 skip_fpu_lt: 78 ld r3, STACK_FRAME_PARAM(3)(sp) 79 cmpdi r3, 0 80 beq skip_vmx_lt 81 /* Get the second half of the array */ 82 addi r3, r3, 16 * 12 83 bl load_vmx 84 skip_vmx_lt: 85 ld r3, STACK_FRAME_PARAM(4)(sp) 86 cmpdi r3, 0 87 beq skip_vsx_lt 88 /* Get the second half of the array */ 89 addi r3, r3, 16 * 12 90 bl load_vsx 91 skip_vsx_lt: 92 li r0, 37 /* sys_kill */ 93 ld r3, STACK_FRAME_PARAM(0)(sp) /* pid */ 94 li r4, 10 /* SIGUSR1 */ 95 sc /* Taking the signal will doom the transaction */ 96 tabort. 0 97 tresume. /* Be super sure we abort */ 98 /* 99 * This will cause us to resume doomed transaction and cause 100 * hardware to cleanup, we'll end up at 1: anything between 101 * tresume. and 1: shouldn't ever run. 102 */ 103 li r3, 0 104 1: 105 POP_VMX(STACK_FRAME_LOCAL(5,0),r4) 106 POP_FPU(512) 107 POP_NVREGS_BELOW_FPU(512) 108 POP_BASIC_STACK(512) 109 blr 110 FUNC_END(tm_signal_self_context_load)
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