Re: [PATCH V10 18/28] selftests, powerpc: Add ptrace tests for GPR/FPR registers

From: Cyril Bur
Date: Tue Mar 01 2016 - 19:40:24 EST

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On Tue, 16 Feb 2016 14:29:48 +0530
Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> wrote:

> This patch adds ptrace interface test for GPR/FPR registers.
> This adds ptrace interface based helper functions related to
> GPR/FPR access and some assembly helper functions related to
> GPR/FPR registers.
>

I wonder if with a bit of thought we could share our assembly helper
functions... https://patchwork.ozlabs.org/patch/589703/

Let me know, happy to meet in the middle and augment my series if needed.

Thanks,

Cyril

> Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
> ---
> tools/testing/selftests/powerpc/ptrace/Makefile | 3 +-
> .../testing/selftests/powerpc/ptrace/ptrace-gpr.c | 191 +++++++++++++++++++
> .../testing/selftests/powerpc/ptrace/ptrace-gpr.h | 73 ++++++++
> tools/testing/selftests/powerpc/ptrace/ptrace.S | 131 +++++++++++++
> tools/testing/selftests/powerpc/ptrace/ptrace.h | 208 +++++++++++++++++++++
> 5 files changed, 605 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
> create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-gpr.h
> create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace.S
>
> diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
> index 8666ac0..f5f62d0 100644
> --- a/tools/testing/selftests/powerpc/ptrace/Makefile
> +++ b/tools/testing/selftests/powerpc/ptrace/Makefile
> @@ -1,4 +1,5 @@
> -TEST_PROGS := ptrace-ebb
> +TEST_PROGS := ptrace-ebb ptrace-gpr
> +
> all: $(TEST_PROGS)
>
> $(TEST_PROGS): ../harness.c ptrace.S ../utils.c
> diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
> new file mode 100644
> index 0000000..f84f0e4
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
> @@ -0,0 +1,191 @@
> +/*
> + * Ptrace test for GPR/FPR registers
> + *
> + * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
> + *
> + * 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 "ptrace.h"
> +#include "ptrace-gpr.h"
> +
> +/* Tracer and Tracee Shared Data */
> +int shm_id;
> +volatile int *cptr, *pptr;
> +
> +extern void store_gpr(unsigned long *addr);
> +extern void store_fpr(float *addr);
> +
> +float a = FPR_1;
> +float b = FPR_2;
> +float c = FPR_3;
> +
> +void gpr(void)
> +{
> + unsigned long gpr_buf[18];
> + float fpr_buf[32];
> +
> + cptr = (int *)shmat(shm_id, NULL, 0);
> +
> + asm __volatile__(
> + "li 14, %[gpr_1];"
> + "li 15, %[gpr_1];"
> + "li 16, %[gpr_1];"
> + "li 17, %[gpr_1];"
> + "li 18, %[gpr_1];"
> + "li 19, %[gpr_1];"
> + "li 20, %[gpr_1];"
> + "li 21, %[gpr_1];"
> + "li 22, %[gpr_1];"
> + "li 23, %[gpr_1];"
> + "li 24, %[gpr_1];"
> + "li 25, %[gpr_1];"
> + "li 26, %[gpr_1];"
> + "li 27, %[gpr_1];"
> + "li 28, %[gpr_1];"
> + "li 29, %[gpr_1];"
> + "li 30, %[gpr_1];"
> + "li 31, %[gpr_1];"
> +
> + "lfs 0, 0(%[flt_1]);"
> + "lfs 1, 0(%[flt_1]);"
> + "lfs 2, 0(%[flt_1]);"
> + "lfs 3, 0(%[flt_1]);"
> + "lfs 4, 0(%[flt_1]);"
> + "lfs 5, 0(%[flt_1]);"
> + "lfs 6, 0(%[flt_1]);"
> + "lfs 7, 0(%[flt_1]);"
> + "lfs 8, 0(%[flt_1]);"
> + "lfs 9, 0(%[flt_1]);"
> + "lfs 10, 0(%[flt_1]);"
> + "lfs 11, 0(%[flt_1]);"
> + "lfs 12, 0(%[flt_1]);"
> + "lfs 13, 0(%[flt_1]);"
> + "lfs 14, 0(%[flt_1]);"
> + "lfs 15, 0(%[flt_1]);"
> + "lfs 16, 0(%[flt_1]);"
> + "lfs 17, 0(%[flt_1]);"
> + "lfs 18, 0(%[flt_1]);"
> + "lfs 19, 0(%[flt_1]);"
> + "lfs 20, 0(%[flt_1]);"
> + "lfs 21, 0(%[flt_1]);"
> + "lfs 22, 0(%[flt_1]);"
> + "lfs 23, 0(%[flt_1]);"
> + "lfs 24, 0(%[flt_1]);"
> + "lfs 25, 0(%[flt_1]);"
> + "lfs 26, 0(%[flt_1]);"
> + "lfs 27, 0(%[flt_1]);"
> + "lfs 28, 0(%[flt_1]);"
> + "lfs 29, 0(%[flt_1]);"
> + "lfs 30, 0(%[flt_1]);"
> + "lfs 31, 0(%[flt_1]);"
> +
> + :
> + :[gpr_1]"i"(GPR_1), [flt_1] "r" (&a)
> + : "memory", "r6", "r7", "r8", "r9", "r10",
> + "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20",
> + "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
> + );
> +
> + while(!cptr[0]);
> +
> + store_gpr(gpr_buf);
> + store_fpr(fpr_buf);
> +
> + if (validate_gpr(gpr_buf, GPR_3))
> + exit(1);
> +
> + if (validate_fpr_float(fpr_buf, c))
> + exit(1);
> +
> + exit(0);
> +}
> +
> +int trace_gpr(pid_t child)
> +{
> + unsigned long gpr[18];
> + unsigned long fpr[32];
> + int ret;
> +
> + sleep(1);
> + ret = start_trace(child);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = show_gpr(child, gpr);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = validate_gpr(gpr, GPR_1);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = show_fpr(child, fpr);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = validate_fpr(fpr, FPR_1_REP);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = write_gpr(child, GPR_3);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = write_fpr(child, FPR_3_REP);
> + if (ret)
> + return TEST_FAIL;
> +
> + ret = stop_trace(child);
> + if (ret)
> + return TEST_FAIL;
> +
> + return TEST_PASS;
> +}
> +
> +int ptrace_gpr(void)
> +{
> + pid_t pid;
> + int ret, status;
> +
> + shm_id = shmget(IPC_PRIVATE, sizeof(int) * 1, 0777|IPC_CREAT);
> + pid = fork();
> + if (pid < 0) {
> + perror("fork() failed");
> + return TEST_FAIL;
> + }
> + if (pid == 0)
> + gpr();
> +
> + if (pid) {
> + pptr = (int *)shmat(shm_id, NULL, 0);
> + ret = trace_gpr(pid);
> + if (ret) {
> + kill(pid, SIGTERM);
> + return TEST_FAIL;
> + }
> +
> + pptr[0] = 1;
> + shmdt((void *)pptr);
> +
> + ret = wait(&status);
> + if (ret != pid) {
> + printf("Child's exit status not captured\n");
> + return TEST_FAIL;
> + }
> +
> + if (WIFEXITED(status)) {
> + if(WEXITSTATUS(status))
> + return TEST_FAIL;
> + }
> + return TEST_PASS;
> + }
> + return TEST_PASS;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + return test_harness(ptrace_gpr, "ptrace_gpr");
> +}
> diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.h b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.h
> new file mode 100644
> index 0000000..6d49f1f
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.h
> @@ -0,0 +1,73 @@
> +/*
> + * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
> + *
> + * 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.
> + */
> +#define GPR_1 1
> +#define GPR_2 2
> +#define GPR_3 3
> +#define GPR_4 4
> +
> +#define FPR_1 0.001
> +#define FPR_2 0.002
> +#define FPR_3 0.003
> +#define FPR_4 0.004
> +
> +#define FPR_1_REP 0x3f50624de0000000
> +#define FPR_2_REP 0x3f60624de0000000
> +#define FPR_3_REP 0x3f689374c0000000
> +#define FPR_4_REP 0x3f70624de0000000
> +
> +/* Buffer must have 18 elements */
> +int validate_gpr(unsigned long *gpr, unsigned long val)
> +{
> + int i, found = 1;
> +
> + for (i = 0; i < 18; i++) {
> + if (gpr[i] != val) {
> + printf("GPR[%d]: %lx Expected: %lx\n", i+14, gpr[i], val);
> + found = 0;
> + }
> + }
> +
> + if (!found)
> + return TEST_FAIL;
> + return TEST_PASS;
> +}
> +
> +/* Buffer must have 32 elements */
> +int validate_fpr(unsigned long *fpr, unsigned long val)
> +{
> + int i, found = 1;
> +
> + for (i = 0; i < 32; i++) {
> + if (fpr[i] != val) {
> + printf("FPR[%d]: %lx Expected: %lx\n", i, fpr[i], val);
> + found = 0;
> + }
> + }
> +
> + if (!found)
> + return TEST_FAIL;
> + return TEST_PASS;
> +}
> +
> +/* Buffer must have 32 elements */
> +int validate_fpr_float(float *fpr, float val)
> +{
> + int i, found = 1;
> +
> + for (i = 0; i < 32; i++) {
> + if (fpr[i] != val) {
> + printf("FPR[%d]: %f Expected: %f\n", i, fpr[i], val);
> + found = 0;
> + }
> + }
> +
> + if (!found)
> + return TEST_FAIL;
> + return TEST_PASS;
> +}
> diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace.S b/tools/testing/selftests/powerpc/ptrace/ptrace.S
> new file mode 100644
> index 0000000..193beea
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/ptrace/ptrace.S
> @@ -0,0 +1,131 @@
> +/*
> + * Ptrace interface test helper assembly functions
> + *
> + * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
> + *
> + * 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 <ppc-asm.h>
> +#include "../reg.h"
> +
> +
> +/* Non volatile GPR - unsigned long buf[18] */
> +FUNC_START(load_gpr)
> + ld 14, 0*8(3)
> + ld 15, 1*8(3)
> + ld 16, 2*8(3)
> + ld 17, 3*8(3)
> + ld 18, 4*8(3)
> + ld 19, 5*8(3)
> + ld 20, 6*8(3)
> + ld 21, 7*8(3)
> + ld 22, 8*8(3)
> + ld 23, 9*8(3)
> + ld 24, 10*8(3)
> + ld 25, 11*8(3)
> + ld 26, 12*8(3)
> + ld 27, 13*8(3)
> + ld 28, 14*8(3)
> + ld 29, 15*8(3)
> + ld 30, 16*8(3)
> + ld 31, 17*8(3)
> + blr
> +FUNC_END(load_gpr)
> +
> +FUNC_START(store_gpr)
> + std 14, 0*8(3)
> + std 15, 1*8(3)
> + std 16, 2*8(3)
> + std 17, 3*8(3)
> + std 18, 4*8(3)
> + std 19, 5*8(3)
> + std 20, 6*8(3)
> + std 21, 7*8(3)
> + std 22, 8*8(3)
> + std 23, 9*8(3)
> + std 24, 10*8(3)
> + std 25, 11*8(3)
> + std 26, 12*8(3)
> + std 27, 13*8(3)
> + std 28, 14*8(3)
> + std 29, 15*8(3)
> + std 30, 16*8(3)
> + std 31, 17*8(3)
> + blr
> +FUNC_END(store_gpr)
> +
> +/* Single Precision Float - float buf[32] */
> +FUNC_START(load_fpr)
> + lfs 0, 0*4(3)
> + lfs 1, 1*4(3)
> + lfs 2, 2*4(3)
> + lfs 3, 3*4(3)
> + lfs 4, 4*4(3)
> + lfs 5, 5*4(3)
> + lfs 6, 6*4(3)
> + lfs 7, 7*4(3)
> + lfs 8, 8*4(3)
> + lfs 9, 9*4(3)
> + lfs 10, 10*4(3)
> + lfs 11, 11*4(3)
> + lfs 12, 12*4(3)
> + lfs 13, 13*4(3)
> + lfs 14, 14*4(3)
> + lfs 15, 15*4(3)
> + lfs 16, 16*4(3)
> + lfs 17, 17*4(3)
> + lfs 18, 18*4(3)
> + lfs 19, 19*4(3)
> + lfs 20, 20*4(3)
> + lfs 21, 21*4(3)
> + lfs 22, 22*4(3)
> + lfs 23, 23*4(3)
> + lfs 24, 24*4(3)
> + lfs 25, 25*4(3)
> + lfs 26, 26*4(3)
> + lfs 27, 27*4(3)
> + lfs 28, 28*4(3)
> + lfs 29, 29*4(3)
> + lfs 30, 30*4(3)
> + lfs 31, 31*4(3)
> + blr
> +FUNC_END(load_fpr)
> +
> +FUNC_START(store_fpr)
> + stfs 0, 0*4(3)
> + stfs 1, 1*4(3)
> + stfs 2, 2*4(3)
> + stfs 3, 3*4(3)
> + stfs 4, 4*4(3)
> + stfs 5, 5*4(3)
> + stfs 6, 6*4(3)
> + stfs 7, 7*4(3)
> + stfs 8, 8*4(3)
> + stfs 9, 9*4(3)
> + stfs 10, 10*4(3)
> + stfs 11, 11*4(3)
> + stfs 12, 12*4(3)
> + stfs 13, 13*4(3)
> + stfs 14, 14*4(3)
> + stfs 15, 15*4(3)
> + stfs 16, 16*4(3)
> + stfs 17, 17*4(3)
> + stfs 18, 18*4(3)
> + stfs 19, 19*4(3)
> + stfs 20, 20*4(3)
> + stfs 21, 21*4(3)
> + stfs 22, 22*4(3)
> + stfs 23, 23*4(3)
> + stfs 24, 24*4(3)
> + stfs 25, 25*4(3)
> + stfs 26, 26*4(3)
> + stfs 27, 27*4(3)
> + stfs 28, 28*4(3)
> + stfs 29, 29*4(3)
> + stfs 30, 30*4(3)
> + stfs 31, 31*4(3)
> + blr
> +FUNC_END(store_fpr)
> diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace.h b/tools/testing/selftests/powerpc/ptrace/ptrace.h
> index 44256d2..439fb65 100644
> --- a/tools/testing/selftests/powerpc/ptrace/ptrace.h
> +++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h
> @@ -157,6 +157,214 @@ fail:
> return TEST_FAIL;
> }
>
> +/* FPR */
> +int show_fpr(pid_t child, unsigned long *fpr)
> +{
> + struct fpr_regs *regs;
> + int ret, i;
> +
> + regs = (struct fpr_regs *) malloc(sizeof(struct fpr_regs));
> + ret = ptrace(PTRACE_GETFPREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + if (fpr) {
> + for (i = 0; i < 32; i++)
> + fpr[i] = regs->fpr[i];
> + }
> + return TEST_PASS;
> +}
> +
> +int write_fpr(pid_t child, unsigned long val)
> +{
> + struct fpr_regs *regs;
> + int ret, i;
> +
> + regs = (struct fpr_regs *) malloc(sizeof(struct fpr_regs));
> + ret = ptrace(PTRACE_GETFPREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + for (i = 0; i < 32; i++)
> + regs->fpr[i] = val;
> +
> + ret = ptrace(PTRACE_SETFPREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> + return TEST_PASS;
> +}
> +
> +int show_ckpt_fpr(pid_t child, unsigned long *fpr)
> +{
> + struct fpr_regs *regs;
> + struct iovec iov;
> + int ret, i;
> +
> + regs = (struct fpr_regs *) malloc(sizeof(struct fpr_regs));
> + iov.iov_base = regs;
> + iov.iov_len = sizeof(struct fpr_regs);
> +
> + ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CFPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + if (fpr) {
> + for (i = 0; i < 32; i++)
> + fpr[i] = regs->fpr[i];
> + }
> +
> + return TEST_PASS;
> +}
> +
> +int write_ckpt_fpr(pid_t child, unsigned long val)
> +{
> + struct fpr_regs *regs;
> + struct iovec iov;
> + int ret, i;
> +
> + regs = (struct fpr_regs *) malloc(sizeof(struct fpr_regs));
> + iov.iov_base = regs;
> + iov.iov_len = sizeof(struct fpr_regs);
> +
> + ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CFPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + for (i = 0; i < 32; i++)
> + regs->fpr[i] = val;
> +
> + ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TM_CFPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> + return TEST_PASS;
> +}
> +
> +/* GPR */
> +int show_gpr(pid_t child, unsigned long *gpr)
> +{
> + struct pt_regs *regs;
> + int ret, i;
> +
> + regs = (struct pt_regs *) malloc(sizeof(struct pt_regs));
> + if (!regs) {
> + perror("malloc() failed");
> + return TEST_FAIL;
> + }
> +
> + ret = ptrace(PTRACE_GETREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + if (gpr) {
> + for (i = 14; i < 32; i++)
> + gpr[i-14] = regs->gpr[i];
> + }
> +
> + return TEST_PASS;
> +}
> +
> +int write_gpr(pid_t child, unsigned long val)
> +{
> + struct pt_regs *regs;
> + int i, ret;
> +
> + regs = (struct pt_regs *) malloc(sizeof(struct pt_regs));
> + if (!regs) {
> + perror("malloc() failed");
> + return TEST_FAIL;
> + }
> +
> + ret = ptrace(PTRACE_GETREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + for (i = 14; i < 32; i++)
> + regs->gpr[i] = val;
> +
> + ret = ptrace(PTRACE_SETREGS, child, NULL, regs);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> + return TEST_PASS;
> +}
> +
> +int show_ckpt_gpr(pid_t child, unsigned long *gpr)
> +{
> + struct pt_regs *regs;
> + struct iovec iov;
> + int ret, i;
> +
> + regs = (struct pt_regs *) malloc(sizeof(struct pt_regs));
> + if (!regs) {
> + perror("malloc() failed");
> + return TEST_FAIL;
> + }
> +
> + iov.iov_base = (u64 *) regs;
> + iov.iov_len = sizeof(struct pt_regs);
> +
> + ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CGPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + if (gpr) {
> + for (i = 14; i < 32; i++)
> + gpr[i-14] = regs->gpr[i];
> + }
> +
> + return TEST_PASS;
> +}
> +
> +int write_ckpt_gpr(pid_t child, unsigned long val)
> +{
> + struct pt_regs *regs;
> + struct iovec iov;
> + int ret, i;
> +
> + regs = (struct pt_regs *) malloc(sizeof(struct pt_regs));
> + if (!regs) {
> + perror("malloc() failed\n");
> + return TEST_FAIL;
> + }
> + iov.iov_base = (u64 *) regs;
> + iov.iov_len = sizeof(struct pt_regs);
> +
> + ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CGPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> +
> + for (i = 14; i < 32; i++)
> + regs->gpr[i] = val;
> +
> + ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TM_CGPR, &iov);
> + if (ret) {
> + perror("ptrace(PTRACE_GETREGSET) failed");
> + return TEST_FAIL;
> + }
> + return TEST_PASS;
> +}
> +
> /* Analyse TEXASR after TM failure */
> inline unsigned long get_tfiar(void)
> {

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