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selftests/powerpc: Add ptrace tests for GPR/FPR registers in TM
This patch adds ptrace interface test for GPR/FPR registers inside TM context. This adds ptrace interface based helper functions related to checkpointed GPR/FPR access. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Simon Guo <wei.guo.simon@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Anshuman Khandual
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Michael Ellerman
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Nov 17, 2016
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ptrace-gpr | ||
ptrace-gpr | ||
ptrace-tm-gpr |
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/* | ||
* Ptrace test for GPR/FPR registers in TM context | ||
* | ||
* 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" | ||
#include "tm.h" | ||
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/* Tracer and Tracee Shared Data */ | ||
int shm_id; | ||
unsigned long *cptr, *pptr; | ||
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float a = FPR_1; | ||
float b = FPR_2; | ||
float c = FPR_3; | ||
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void tm_gpr(void) | ||
{ | ||
unsigned long gpr_buf[18]; | ||
unsigned long result, texasr; | ||
float fpr_buf[32]; | ||
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printf("Starting the child\n"); | ||
cptr = (unsigned long *)shmat(shm_id, NULL, 0); | ||
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trans: | ||
cptr[1] = 0; | ||
asm __volatile__( | ||
ASM_LOAD_GPR_IMMED(gpr_1) | ||
ASM_LOAD_FPR_SINGLE_PRECISION(flt_1) | ||
"1: ;" | ||
"tbegin.;" | ||
"beq 2f;" | ||
ASM_LOAD_GPR_IMMED(gpr_2) | ||
ASM_LOAD_FPR_SINGLE_PRECISION(flt_2) | ||
"tsuspend.;" | ||
"li 7, 1;" | ||
"stw 7, 0(%[cptr1]);" | ||
"tresume.;" | ||
"b .;" | ||
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"tend.;" | ||
"li 0, 0;" | ||
"ori %[res], 0, 0;" | ||
"b 3f;" | ||
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/* Transaction abort handler */ | ||
"2: ;" | ||
"li 0, 1;" | ||
"ori %[res], 0, 0;" | ||
"mfspr %[texasr], %[sprn_texasr];" | ||
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"3: ;" | ||
: [res] "=r" (result), [texasr] "=r" (texasr) | ||
: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), | ||
[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "r" (&a), | ||
[flt_2] "r" (&b), [cptr1] "r" (&cptr[1]) | ||
: "memory", "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" | ||
); | ||
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if (result) { | ||
if (!cptr[0]) | ||
goto trans; | ||
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shmdt((void *)cptr); | ||
store_gpr(gpr_buf); | ||
store_fpr_single_precision(fpr_buf); | ||
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if (validate_gpr(gpr_buf, GPR_3)) | ||
exit(1); | ||
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if (validate_fpr_float(fpr_buf, c)) | ||
exit(1); | ||
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exit(0); | ||
} | ||
shmdt((void *)cptr); | ||
exit(1); | ||
} | ||
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int trace_tm_gpr(pid_t child) | ||
{ | ||
unsigned long gpr[18]; | ||
unsigned long fpr[32]; | ||
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FAIL_IF(start_trace(child)); | ||
FAIL_IF(show_gpr(child, gpr)); | ||
FAIL_IF(validate_gpr(gpr, GPR_2)); | ||
FAIL_IF(show_fpr(child, fpr)); | ||
FAIL_IF(validate_fpr(fpr, FPR_2_REP)); | ||
FAIL_IF(show_ckpt_fpr(child, fpr)); | ||
FAIL_IF(validate_fpr(fpr, FPR_1_REP)); | ||
FAIL_IF(show_ckpt_gpr(child, gpr)); | ||
FAIL_IF(validate_gpr(gpr, GPR_1)); | ||
FAIL_IF(write_ckpt_gpr(child, GPR_3)); | ||
FAIL_IF(write_ckpt_fpr(child, FPR_3_REP)); | ||
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pptr[0] = 1; | ||
FAIL_IF(stop_trace(child)); | ||
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return TEST_PASS; | ||
} | ||
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int ptrace_tm_gpr(void) | ||
{ | ||
pid_t pid; | ||
int ret, status; | ||
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SKIP_IF(!have_htm()); | ||
shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT); | ||
pid = fork(); | ||
if (pid < 0) { | ||
perror("fork() failed"); | ||
return TEST_FAIL; | ||
} | ||
if (pid == 0) | ||
tm_gpr(); | ||
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if (pid) { | ||
pptr = (unsigned long *)shmat(shm_id, NULL, 0); | ||
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while (!pptr[1]) | ||
asm volatile("" : : : "memory"); | ||
ret = trace_tm_gpr(pid); | ||
if (ret) { | ||
kill(pid, SIGTERM); | ||
return TEST_FAIL; | ||
} | ||
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shmdt((void *)pptr); | ||
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ret = wait(&status); | ||
shmctl(shm_id, IPC_RMID, NULL); | ||
if (ret != pid) { | ||
printf("Child's exit status not captured\n"); | ||
return TEST_FAIL; | ||
} | ||
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return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL : | ||
TEST_PASS; | ||
} | ||
return TEST_PASS; | ||
} | ||
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int main(int argc, char *argv[]) | ||
{ | ||
return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr"); | ||
} |