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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* test helper assembly functions
*
* Copyright (C) 2016 Simon Guo, IBM Corporation.
* Copyright 2022 Michael Ellerman, IBM Corporation.
*/
#include "basic_asm.h"
#define GPR_SIZE __SIZEOF_LONG__
#define FIRST_GPR 14
#define NUM_GPRS (32 - FIRST_GPR)
#define STACK_SIZE (NUM_GPRS * GPR_SIZE)
// gpr_child_loop(int *read_flag, int *write_flag,
// unsigned long *gpr_buf, double *fpr_buf);
FUNC_START(gpr_child_loop)
// r3 = read_flag
// r4 = write_flag
// r5 = gpr_buf
// r6 = fpr_buf
PUSH_BASIC_STACK(STACK_SIZE)
// Save non-volatile GPRs
OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR
// Load GPRs with expected values
OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR
// Load FPRs with expected values
OP_REGS lfd, 8, 0, 31, r6
// Signal to parent that we're ready
li r0, 1
stw r0, 0(r4)
// Wait for parent to finish
1: lwz r0, 0(r3)
cmpwi r0, 0
beq 1b // Loop while flag is zero
// Save GPRs back to caller buffer
OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR
// Save FPRs
OP_REGS stfd, 8, 0, 31, r6
// Reload non-volatile GPRs
OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR
POP_BASIC_STACK(STACK_SIZE)
blr
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