powerpc/ptrace/ptrace-tm-spd-vsx.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Ptrace test for VMX/VSX registers in the TM Suspend context
0004  *
0005  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
0006  */
0007 #include "ptrace.h"
0008 #include "tm.h"
0009 #include "ptrace-vsx.h"
0010
0011 int shm_id;
0012 int *cptr, *pptr;
0013
0014 unsigned long fp_load[VEC_MAX];
0015 unsigned long fp_load_new[VEC_MAX];
0016 unsigned long fp_store[VEC_MAX];
0017 unsigned long fp_load_ckpt[VEC_MAX];
0018 unsigned long fp_load_ckpt_new[VEC_MAX];
0019
0020 __attribute__((used)) void load_vsx(void)
0021 {
0022     loadvsx(fp_load, 0);
0023 }
0024
0025 __attribute__((used)) void load_vsx_new(void)
0026 {
0027     loadvsx(fp_load_new, 0);
0028 }
0029
0030 __attribute__((used)) void load_vsx_ckpt(void)
0031 {
0032     loadvsx(fp_load_ckpt, 0);
0033 }
0034
0035 __attribute__((used)) void wait_parent(void)
0036 {
0037     cptr[2] = 1;
0038     while (!cptr[1])
0039         asm volatile("" : : : "memory");
0040 }
0041
0042 void tm_spd_vsx(void)
0043 {
0044     unsigned long result, texasr;
0045     int ret;
0046
0047     cptr = (int *)shmat(shm_id, NULL, 0);
0048
0049 trans:
0050     cptr[2] = 0;
0051     asm __volatile__(
0052         "bl load_vsx_ckpt;"
0053
0054         "1: ;"
0055         "tbegin.;"
0056         "beq 2f;"
0057
0058         "bl load_vsx_new;"
0059         "tsuspend.;"
0060         "bl load_vsx;"
0061         "bl wait_parent;"
0062         "tresume.;"
0063
0064         "tend.;"
0065         "li 0, 0;"
0066         "ori %[res], 0, 0;"
0067         "b 3f;"
0068
0069         "2: ;"
0070         "li 0, 1;"
0071         "ori %[res], 0, 0;"
0072         "mfspr %[texasr], %[sprn_texasr];"
0073
0074         "3: ;"
0075         : [res] "=r" (result), [texasr] "=r" (texasr)
0076         : [sprn_texasr] "i"  (SPRN_TEXASR)
0077         : "memory", "r0", "r3", "r4",
0078           "r7", "r8", "r9", "r10", "r11", "lr"
0079         );
0080
0081     if (result) {
0082         if (!cptr[0])
0083             goto trans;
0084         shmdt((void *)cptr);
0085
0086         storevsx(fp_store, 0);
0087         ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
0088         if (ret)
0089             exit(1);
0090         exit(0);
0091     }
0092     shmdt((void *)cptr);
0093     exit(1);
0094 }
0095
0096 int trace_tm_spd_vsx(pid_t child)
0097 {
0098     unsigned long vsx[VSX_MAX];
0099     unsigned long vmx[VMX_MAX + 2][2];
0100
0101     FAIL_IF(start_trace(child));
0102     FAIL_IF(show_vsx(child, vsx));
0103     FAIL_IF(validate_vsx(vsx, fp_load));
0104     FAIL_IF(show_vmx(child, vmx));
0105     FAIL_IF(validate_vmx(vmx, fp_load));
0106     FAIL_IF(show_vsx_ckpt(child, vsx));
0107     FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
0108     FAIL_IF(show_vmx_ckpt(child, vmx));
0109     FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
0110
0111     memset(vsx, 0, sizeof(vsx));
0112     memset(vmx, 0, sizeof(vmx));
0113
0114     load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
0115
0116     FAIL_IF(write_vsx_ckpt(child, vsx));
0117     FAIL_IF(write_vmx_ckpt(child, vmx));
0118
0119     pptr[0] = 1;
0120     pptr[1] = 1;
0121     FAIL_IF(stop_trace(child));
0122
0123     return TEST_PASS;
0124 }
0125
0126 int ptrace_tm_spd_vsx(void)
0127 {
0128     pid_t pid;
0129     int ret, status, i;
0130
0131     SKIP_IF(!have_htm());
0132     SKIP_IF(htm_is_synthetic());
0133     shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
0134
0135     for (i = 0; i < 128; i++) {
0136         fp_load[i] = 1 + rand();
0137         fp_load_new[i] = 1 + 2 * rand();
0138         fp_load_ckpt[i] = 1 + 3 * rand();
0139         fp_load_ckpt_new[i] = 1 + 4 * rand();
0140     }
0141
0142     pid = fork();
0143     if (pid < 0) {
0144         perror("fork() failed");
0145         return TEST_FAIL;
0146     }
0147
0148     if (pid == 0)
0149         tm_spd_vsx();
0150
0151     if (pid) {
0152         pptr = (int *)shmat(shm_id, NULL, 0);
0153         while (!pptr[2])
0154             asm volatile("" : : : "memory");
0155
0156         ret = trace_tm_spd_vsx(pid);
0157         if (ret) {
0158             kill(pid, SIGKILL);
0159             shmdt((void *)pptr);
0160             shmctl(shm_id, IPC_RMID, NULL);
0161             return TEST_FAIL;
0162         }
0163
0164         shmdt((void *)pptr);
0165         ret = wait(&status);
0166         shmctl(shm_id, IPC_RMID, NULL);
0167         if (ret != pid) {
0168             printf("Child's exit status not captured\n");
0169             return TEST_FAIL;
0170         }
0171
0172         return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
0173             TEST_PASS;
0174     }
0175     return TEST_PASS;
0176 }
0177
0178 int main(int argc, char *argv[])
0179 {
0180     return test_harness(ptrace_tm_spd_vsx, "ptrace_tm_spd_vsx");
0181 }