ptrace-tm-gpr.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Ptrace test for GPR/FPR registers in TM context
  4 *
  5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
  6 */
  7#include "ptrace.h"
  8#include "ptrace-gpr.h"
  9#include "tm.h"
 10
 11/* Tracer and Tracee Shared Data */
 12int shm_id;
 13unsigned long *cptr, *pptr;
 14
 15double a = FPR_1;
 16double b = FPR_2;
 17double c = FPR_3;
 18
 19void tm_gpr(void)
 20{
 21	unsigned long gpr_buf[18];
 22	unsigned long result, texasr;
 23	double fpr_buf[32];
 24
 25	printf("Starting the child\n");
 26	cptr = (unsigned long *)shmat(shm_id, NULL, 0);
 27
 28trans:
 29	cptr[1] = 0;
 30	asm __volatile__(
 31		ASM_LOAD_GPR_IMMED(gpr_1)
 32		ASM_LOAD_FPR(flt_1)
 33		"1: ;"
 34		"tbegin.;"
 35		"beq 2f;"
 36		ASM_LOAD_GPR_IMMED(gpr_2)
 37		ASM_LOAD_FPR(flt_2)
 38		"tsuspend.;"
 39		"li 7, 1;"
 40		"stw 7, 0(%[cptr1]);"
 41		"tresume.;"
 42		"b .;"
 43
 44		"tend.;"
 45		"li 0, 0;"
 46		"ori %[res], 0, 0;"
 47		"b 3f;"
 48
 49		/* Transaction abort handler */
 50		"2: ;"
 51		"li 0, 1;"
 52		"ori %[res], 0, 0;"
 53		"mfspr %[texasr], %[sprn_texasr];"
 54
 55		"3: ;"
 56		: [res] "=r" (result), [texasr] "=r" (texasr)
 57		: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
 58		[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
 59		[flt_2] "b" (&b), [cptr1] "b" (&cptr[1])
 60		: "memory", "r0", "r7", "r8", "r9", "r10",
 61		"r11", "r12", "r13", "r14", "r15", "r16",
 62		"r17", "r18", "r19", "r20", "r21", "r22",
 63		"r23", "r24", "r25", "r26", "r27", "r28",
 64		"r29", "r30", "r31"
 65		);
 66
 67	if (result) {
 68		if (!cptr[0])
 69			goto trans;
 70
 71		shmdt((void *)cptr);
 72		store_gpr(gpr_buf);
 73		store_fpr(fpr_buf);
 74
 75		if (validate_gpr(gpr_buf, GPR_3))
 76			exit(1);
 77
 78		if (validate_fpr_double(fpr_buf, c))
 79			exit(1);
 80
 81		exit(0);
 82	}
 83	shmdt((void *)cptr);
 84	exit(1);
 85}
 86
 87int trace_tm_gpr(pid_t child)
 88{
 89	unsigned long gpr[18];
 90	__u64 fpr[32];
 91
 92	FAIL_IF(start_trace(child));
 93	FAIL_IF(show_gpr(child, gpr));
 94	FAIL_IF(validate_gpr(gpr, GPR_2));
 95	FAIL_IF(show_fpr(child, fpr));
 96	FAIL_IF(validate_fpr(fpr, FPR_2_REP));
 97	FAIL_IF(show_ckpt_fpr(child, fpr));
 98	FAIL_IF(validate_fpr(fpr, FPR_1_REP));
 99	FAIL_IF(show_ckpt_gpr(child, gpr));
100	FAIL_IF(validate_gpr(gpr, GPR_1));
101	FAIL_IF(write_ckpt_gpr(child, GPR_3));
102	FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
103
104	pptr[0] = 1;
105	FAIL_IF(stop_trace(child));
106
107	return TEST_PASS;
108}
109
110int ptrace_tm_gpr(void)
111{
112	pid_t pid;
113	int ret, status;
114
115	SKIP_IF_MSG(!have_htm(), "Don't have transactional memory");
116	SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic");
117	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
118	pid = fork();
119	if (pid < 0) {
120		perror("fork() failed");
121		return TEST_FAIL;
122	}
123	if (pid == 0)
124		tm_gpr();
125
126	if (pid) {
127		pptr = (unsigned long *)shmat(shm_id, NULL, 0);
128
129		while (!pptr[1])
130			asm volatile("" : : : "memory");
131		ret = trace_tm_gpr(pid);
132		if (ret) {
133			kill(pid, SIGTERM);
134			return TEST_FAIL;
135		}
136
137		shmdt((void *)pptr);
138
139		ret = wait(&status);
140		shmctl(shm_id, IPC_RMID, NULL);
141		if (ret != pid) {
142			printf("Child's exit status not captured\n");
143			return TEST_FAIL;
144		}
145
146		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
147			TEST_PASS;
148	}
149	return TEST_PASS;
150}
151
152int main(int argc, char *argv[])
153{
154	return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
155}