// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Ptrace test for GPR/FPR registers in TM context
 *
 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
 */
#include "ptrace.h"
#include "ptrace-gpr.h"
#include "tm.h"

/* Tracer and Tracee Shared Data */
int shm_id;
unsigned long *cptr, *pptr;

double a = FPR_1;
double b = FPR_2;
double c = FPR_3;

void tm_gpr(void)
{
        unsigned long gpr_buf[18];
        unsigned long result, texasr;
        double fpr_buf[32];

        printf("Starting the child\n");
        cptr = (unsigned long *)shmat(shm_id, NULL, 0);

trans:
        cptr[1] = 0;
        asm __volatile__(
                ASM_LOAD_GPR_IMMED(gpr_1)
                ASM_LOAD_FPR(flt_1)
                "1: ;"
                "tbegin.;"
                "beq 2f;"
                ASM_LOAD_GPR_IMMED(gpr_2)
                ASM_LOAD_FPR(flt_2)
                "tsuspend.;"
                "li 7, 1;"
                "stw 7, 0(%[cptr1]);"
                "tresume.;"
                "b .;"

                "tend.;"
                "li 0, 0;"
                "ori %[res], 0, 0;"
                "b 3f;"

                /* Transaction abort handler */
                "2: ;"
                "li 0, 1;"
                "ori %[res], 0, 0;"
                "mfspr %[texasr], %[sprn_texasr];"

                "3: ;"
                : [res] "=r" (result), [texasr] "=r" (texasr)
                : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
                [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
                [flt_2] "b" (&b), [cptr1] "b" (&cptr[1])
                : "memory", "r0", "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"
                );

        if (result) {
                if (!cptr[0])
                        goto trans;

                shmdt((void *)cptr);
                store_gpr(gpr_buf);
                store_fpr(fpr_buf);

                if (validate_gpr(gpr_buf, GPR_3))
                        exit(1);

                if (validate_fpr_double(fpr_buf, c))
                        exit(1);

                exit(0);
        }
        shmdt((void *)cptr);
        exit(1);
}

int trace_tm_gpr(pid_t child)
{
        unsigned long gpr[18];
        __u64 fpr[32];

        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));

        pptr[0] = 1;
        FAIL_IF(stop_trace(child));

        return TEST_PASS;
}

int ptrace_tm_gpr(void)
{
        pid_t pid;
        int ret, status;

        SKIP_IF_MSG(!have_htm(), "Don't have transactional memory");
        SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic");
        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();

        if (pid) {
                pptr = (unsigned long *)shmat(shm_id, NULL, 0);

                while (!pptr[1])
                        asm volatile("" : : : "memory");
                ret = trace_tm_gpr(pid);
                if (ret) {
                        kill(pid, SIGTERM);
                        return TEST_FAIL;
                }

                shmdt((void *)pptr);

                ret = wait(&status);
                shmctl(shm_id, IPC_RMID, NULL);
                if (ret != pid) {
                        printf("Child's exit status not captured\n");
                        return TEST_FAIL;
                }

                return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
                        TEST_PASS;
        }
        return TEST_PASS;
}

int main(int argc, char *argv[])
{
        return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
}