cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ptrace-tm-spd-gpr.c (3307B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Ptrace test for GPR/FPR registers in TM Suspend 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;
     13int *cptr, *pptr;
     14
     15float a = FPR_1;
     16float b = FPR_2;
     17float c = FPR_3;
     18float d = FPR_4;
     19
     20__attribute__((used)) void wait_parent(void)
     21{
     22	cptr[2] = 1;
     23	while (!cptr[1])
     24		asm volatile("" : : : "memory");
     25}
     26
     27void tm_spd_gpr(void)
     28{
     29	unsigned long gpr_buf[18];
     30	unsigned long result, texasr;
     31	float fpr_buf[32];
     32
     33	cptr = (int *)shmat(shm_id, NULL, 0);
     34
     35trans:
     36	cptr[2] = 0;
     37	asm __volatile__(
     38		ASM_LOAD_GPR_IMMED(gpr_1)
     39		ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
     40
     41		"1: ;"
     42		"tbegin.;"
     43		"beq 2f;"
     44
     45		ASM_LOAD_GPR_IMMED(gpr_2)
     46		"tsuspend.;"
     47		ASM_LOAD_GPR_IMMED(gpr_4)
     48		ASM_LOAD_FPR_SINGLE_PRECISION(flt_4)
     49
     50		"bl wait_parent;"
     51		"tresume.;"
     52		"tend.;"
     53		"li 0, 0;"
     54		"ori %[res], 0, 0;"
     55		"b 3f;"
     56
     57		/* Transaction abort handler */
     58		"2: ;"
     59		"li 0, 1;"
     60		"ori %[res], 0, 0;"
     61		"mfspr %[texasr], %[sprn_texasr];"
     62
     63		"3: ;"
     64		: [res] "=r" (result), [texasr] "=r" (texasr)
     65		: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
     66		[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
     67		[flt_4] "b" (&d)
     68		: "memory", "r0", "r5", "r6", "r7",
     69		"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
     70		"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
     71		"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
     72		);
     73
     74	if (result) {
     75		if (!cptr[0])
     76			goto trans;
     77
     78		shmdt((void *)cptr);
     79		store_gpr(gpr_buf);
     80		store_fpr_single_precision(fpr_buf);
     81
     82		if (validate_gpr(gpr_buf, GPR_3))
     83			exit(1);
     84
     85		if (validate_fpr_float(fpr_buf, c))
     86			exit(1);
     87		exit(0);
     88	}
     89	shmdt((void *)cptr);
     90	exit(1);
     91}
     92
     93int trace_tm_spd_gpr(pid_t child)
     94{
     95	unsigned long gpr[18];
     96	unsigned long fpr[32];
     97
     98	FAIL_IF(start_trace(child));
     99	FAIL_IF(show_gpr(child, gpr));
    100	FAIL_IF(validate_gpr(gpr, GPR_4));
    101	FAIL_IF(show_fpr(child, fpr));
    102	FAIL_IF(validate_fpr(fpr, FPR_4_REP));
    103	FAIL_IF(show_ckpt_fpr(child, fpr));
    104	FAIL_IF(validate_fpr(fpr, FPR_1_REP));
    105	FAIL_IF(show_ckpt_gpr(child, gpr));
    106	FAIL_IF(validate_gpr(gpr, GPR_1));
    107	FAIL_IF(write_ckpt_gpr(child, GPR_3));
    108	FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
    109
    110	pptr[0] = 1;
    111	pptr[1] = 1;
    112	FAIL_IF(stop_trace(child));
    113	return TEST_PASS;
    114}
    115
    116int ptrace_tm_spd_gpr(void)
    117{
    118	pid_t pid;
    119	int ret, status;
    120
    121	SKIP_IF(!have_htm());
    122	SKIP_IF(htm_is_synthetic());
    123	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
    124	pid = fork();
    125	if (pid < 0) {
    126		perror("fork() failed");
    127		return TEST_FAIL;
    128	}
    129
    130	if (pid == 0)
    131		tm_spd_gpr();
    132
    133	if (pid) {
    134		pptr = (int *)shmat(shm_id, NULL, 0);
    135		pptr[0] = 0;
    136		pptr[1] = 0;
    137
    138		while (!pptr[2])
    139			asm volatile("" : : : "memory");
    140		ret = trace_tm_spd_gpr(pid);
    141		if (ret) {
    142			kill(pid, SIGTERM);
    143			shmdt((void *)pptr);
    144			shmctl(shm_id, IPC_RMID, NULL);
    145			return TEST_FAIL;
    146		}
    147
    148		shmdt((void *)pptr);
    149
    150		ret = wait(&status);
    151		shmctl(shm_id, IPC_RMID, NULL);
    152		if (ret != pid) {
    153			printf("Child's exit status not captured\n");
    154			return TEST_FAIL;
    155		}
    156
    157		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
    158			TEST_PASS;
    159	}
    160	return TEST_PASS;
    161}
    162
    163int main(int argc, char *argv[])
    164{
    165	return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
    166}