| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * test helper assembly functions |
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| 4 | * |
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| 5 | * Copyright (C) 2016 Simon Guo, IBM Corporation. |
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| 6 | * Copyright 2022 Michael Ellerman, IBM Corporation. |
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| 7 | */ |
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| 8 | #include "basic_asm.h" |
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| 9 | |
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| 10 | #define GPR_SIZE __SIZEOF_LONG__ |
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| 11 | #define FIRST_GPR 14 |
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| 12 | #define NUM_GPRS (32 - FIRST_GPR) |
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| 13 | #define STACK_SIZE (NUM_GPRS * GPR_SIZE) |
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| 14 | |
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| 15 | // gpr_child_loop(int *read_flag, int *write_flag, |
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| 16 | // unsigned long *gpr_buf, double *fpr_buf); |
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| 17 | FUNC_START(gpr_child_loop) |
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| 18 | // r3 = read_flag |
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| 19 | // r4 = write_flag |
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| 20 | // r5 = gpr_buf |
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| 21 | // r6 = fpr_buf |
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| 22 | PUSH_BASIC_STACK(STACK_SIZE) |
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| 23 | |
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| 24 | // Save non-volatile GPRs |
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| 25 | OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR |
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| 26 | |
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| 27 | // Load GPRs with expected values |
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| 28 | OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR |
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| 29 | |
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| 30 | // Load FPRs with expected values |
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| 31 | OP_REGS lfd, 8, 0, 31, r6 |
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| 32 | |
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| 33 | // Signal to parent that we're ready |
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| 34 | li r0, 1 |
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| 35 | stw r0, 0(r4) |
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| 36 | |
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| 37 | // Wait for parent to finish |
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| 38 | 1: lwz r0, 0(r3) |
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| 39 | cmpwi r0, 0 |
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| 40 | beq 1b // Loop while flag is zero |
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| 41 | |
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| 42 | // Save GPRs back to caller buffer |
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| 43 | OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR |
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| 44 | |
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| 45 | // Save FPRs |
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| 46 | OP_REGS stfd, 8, 0, 31, r6 |
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| 47 | |
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| 48 | // Reload non-volatile GPRs |
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| 49 | OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR |
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| 50 | |
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| 51 | POP_BASIC_STACK(STACK_SIZE) |
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| 52 | blr |
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| 53 | |
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