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Linux/tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c

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  1 /*
  2  * Ptrace test for GPR/FPR registers in TM context
  3  *
  4  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 #include "ptrace.h"
 12 #include "ptrace-gpr.h"
 13 #include "tm.h"
 14 
 15 /* Tracer and Tracee Shared Data */
 16 int shm_id;
 17 unsigned long *cptr, *pptr;
 18 
 19 float a = FPR_1;
 20 float b = FPR_2;
 21 float c = FPR_3;
 22 
 23 void tm_gpr(void)
 24 {
 25         unsigned long gpr_buf[18];
 26         unsigned long result, texasr;
 27         float fpr_buf[32];
 28 
 29         printf("Starting the child\n");
 30         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
 31 
 32 trans:
 33         cptr[1] = 0;
 34         asm __volatile__(
 35                 ASM_LOAD_GPR_IMMED(gpr_1)
 36                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
 37                 "1: ;"
 38                 "tbegin.;"
 39                 "beq 2f;"
 40                 ASM_LOAD_GPR_IMMED(gpr_2)
 41                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_2)
 42                 "tsuspend.;"
 43                 "li 7, 1;"
 44                 "stw 7, 0(%[cptr1]);"
 45                 "tresume.;"
 46                 "b .;"
 47 
 48                 "tend.;"
 49                 "li 0, 0;"
 50                 "ori %[res], 0, 0;"
 51                 "b 3f;"
 52 
 53                 /* Transaction abort handler */
 54                 "2: ;"
 55                 "li 0, 1;"
 56                 "ori %[res], 0, 0;"
 57                 "mfspr %[texasr], %[sprn_texasr];"
 58 
 59                 "3: ;"
 60                 : [res] "=r" (result), [texasr] "=r" (texasr)
 61                 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
 62                 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
 63                 [flt_2] "b" (&b), [cptr1] "b" (&cptr[1])
 64                 : "memory", "r7", "r8", "r9", "r10",
 65                 "r11", "r12", "r13", "r14", "r15", "r16",
 66                 "r17", "r18", "r19", "r20", "r21", "r22",
 67                 "r23", "r24", "r25", "r26", "r27", "r28",
 68                 "r29", "r30", "r31"
 69                 );
 70 
 71         if (result) {
 72                 if (!cptr[0])
 73                         goto trans;
 74 
 75                 shmdt((void *)cptr);
 76                 store_gpr(gpr_buf);
 77                 store_fpr_single_precision(fpr_buf);
 78 
 79                 if (validate_gpr(gpr_buf, GPR_3))
 80                         exit(1);
 81 
 82                 if (validate_fpr_float(fpr_buf, c))
 83                         exit(1);
 84 
 85                 exit(0);
 86         }
 87         shmdt((void *)cptr);
 88         exit(1);
 89 }
 90 
 91 int trace_tm_gpr(pid_t child)
 92 {
 93         unsigned long gpr[18];
 94         unsigned long fpr[32];
 95 
 96         FAIL_IF(start_trace(child));
 97         FAIL_IF(show_gpr(child, gpr));
 98         FAIL_IF(validate_gpr(gpr, GPR_2));
 99         FAIL_IF(show_fpr(child, fpr));
100         FAIL_IF(validate_fpr(fpr, FPR_2_REP));
101         FAIL_IF(show_ckpt_fpr(child, fpr));
102         FAIL_IF(validate_fpr(fpr, FPR_1_REP));
103         FAIL_IF(show_ckpt_gpr(child, gpr));
104         FAIL_IF(validate_gpr(gpr, GPR_1));
105         FAIL_IF(write_ckpt_gpr(child, GPR_3));
106         FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
107 
108         pptr[0] = 1;
109         FAIL_IF(stop_trace(child));
110 
111         return TEST_PASS;
112 }
113 
114 int ptrace_tm_gpr(void)
115 {
116         pid_t pid;
117         int ret, status;
118 
119         SKIP_IF(!have_htm());
120         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
121         pid = fork();
122         if (pid < 0) {
123                 perror("fork() failed");
124                 return TEST_FAIL;
125         }
126         if (pid == 0)
127                 tm_gpr();
128 
129         if (pid) {
130                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
131 
132                 while (!pptr[1])
133                         asm volatile("" : : : "memory");
134                 ret = trace_tm_gpr(pid);
135                 if (ret) {
136                         kill(pid, SIGTERM);
137                         return TEST_FAIL;
138                 }
139 
140                 shmdt((void *)pptr);
141 
142                 ret = wait(&status);
143                 shmctl(shm_id, IPC_RMID, NULL);
144                 if (ret != pid) {
145                         printf("Child's exit status not captured\n");
146                         return TEST_FAIL;
147                 }
148 
149                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
150                         TEST_PASS;
151         }
152         return TEST_PASS;
153 }
154 
155 int main(int argc, char *argv[])
156 {
157         return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
158 }
159 

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