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