/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include "basic_asm.h"
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#include "gpr_asm.h"
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#include "fpu_asm.h"
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#include "vmx_asm.h"
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#include "vsx_asm.h"
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/*
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* Large caveat here being that the caller cannot expect the
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* signal to always be sent! The hardware can (AND WILL!) abort
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* the transaction between the tbegin and the tsuspend (however
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* unlikely it seems or infrequently it actually happens).
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* You have been warned.
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*/
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/* long tm_signal_self(pid_t pid, long *gprs, double *fps, vector *vms, vector *vss); */
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FUNC_START(tm_signal_self_context_load)
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PUSH_BASIC_STACK(512)
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/*
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* Don't strictly need to save and restore as it depends on if
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* we're going to use them, however this reduces messy logic
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*/
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PUSH_VMX(STACK_FRAME_LOCAL(5,0),r8)
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PUSH_FPU(512)
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PUSH_NVREGS_BELOW_FPU(512)
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std r3, STACK_FRAME_PARAM(0)(sp) /* pid */
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std r4, STACK_FRAME_PARAM(1)(sp) /* gps */
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std r5, STACK_FRAME_PARAM(2)(sp) /* fps */
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std r6, STACK_FRAME_PARAM(3)(sp) /* vms */
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std r7, STACK_FRAME_PARAM(4)(sp) /* vss */
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ld r3, STACK_FRAME_PARAM(1)(sp)
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cmpdi r3, 0
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beq skip_gpr_lc
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bl load_gpr
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skip_gpr_lc:
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ld r3, STACK_FRAME_PARAM(2)(sp)
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cmpdi r3, 0
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beq skip_fpu_lc
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bl load_fpu
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skip_fpu_lc:
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ld r3, STACK_FRAME_PARAM(3)(sp)
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cmpdi r3, 0
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beq skip_vmx_lc
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bl load_vmx
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skip_vmx_lc:
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ld r3, STACK_FRAME_PARAM(4)(sp)
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cmpdi r3, 0
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beq skip_vsx_lc
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bl load_vsx
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skip_vsx_lc:
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/*
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* Set r3 (return value) before tbegin. Use the pid as a known
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* 'all good' return value, zero is used to indicate a non-doomed
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* transaction.
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*/
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ld r3, STACK_FRAME_PARAM(0)(sp)
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tbegin.
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beq 1f
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tsuspend. /* Can't enter a syscall transactionally */
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ld r3, STACK_FRAME_PARAM(1)(sp)
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cmpdi r3, 0
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beq skip_gpr_lt
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/* Get the second half of the array */
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addi r3, r3, 8 * 18
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bl load_gpr
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skip_gpr_lt:
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ld r3, STACK_FRAME_PARAM(2)(sp)
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cmpdi r3, 0
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beq skip_fpu_lt
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/* Get the second half of the array */
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addi r3, r3, 8 * 18
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bl load_fpu
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skip_fpu_lt:
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ld r3, STACK_FRAME_PARAM(3)(sp)
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cmpdi r3, 0
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beq skip_vmx_lt
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/* Get the second half of the array */
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addi r3, r3, 16 * 12
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bl load_vmx
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skip_vmx_lt:
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ld r3, STACK_FRAME_PARAM(4)(sp)
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cmpdi r3, 0
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beq skip_vsx_lt
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/* Get the second half of the array */
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addi r3, r3, 16 * 12
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bl load_vsx
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skip_vsx_lt:
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li r0, 37 /* sys_kill */
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ld r3, STACK_FRAME_PARAM(0)(sp) /* pid */
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li r4, 10 /* SIGUSR1 */
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sc /* Taking the signal will doom the transaction */
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tabort. 0
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tresume. /* Be super sure we abort */
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/*
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* This will cause us to resume doomed transaction and cause
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* hardware to cleanup, we'll end up at 1: anything between
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* tresume. and 1: shouldn't ever run.
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*/
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li r3, 0
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1:
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POP_VMX(STACK_FRAME_LOCAL(5,0),r4)
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POP_FPU(512)
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POP_NVREGS_BELOW_FPU(512)
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POP_BASIC_STACK(512)
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blr
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FUNC_END(tm_signal_self_context_load)
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