115 lines
3 KiB
ArmAsm
115 lines
3 KiB
ArmAsm
/*
|
|
* 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)
|