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

int shm_id;
unsigned long *cptr, *pptr;


void tm_tar(void)
{
        unsigned long result, texasr;
        unsigned long regs[3];
        int ret;

        cptr = (unsigned long *)shmat(shm_id, NULL, 0);

trans:
        cptr[1] = 0;
        asm __volatile__(
                "li     4, %[tar_1];"
                "mtspr %[sprn_tar],  4;"        /* TAR_1 */
                "li     4, %[dscr_1];"
                "mtspr %[sprn_dscr], 4;"        /* DSCR_1 */
                "or     31,31,31;"              /* PPR_1*/

                "1: ;"
                "tbegin.;"
                "beq 2f;"

                "li     4, %[tar_2];"
                "mtspr %[sprn_tar],  4;"        /* TAR_2 */
                "li     4, %[dscr_2];"
                "mtspr %[sprn_dscr], 4;"        /* DSCR_2 */
                "or     1,1,1;"                 /* PPR_2 */
                "tsuspend.;"
                "li 0, 1;"
                "stw 0, 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)
                : [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR),
                [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
                [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2),
                [dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1])
                : "memory", "r0", "r3", "r4", "r5", "r6"
                );

        /* TM failed, analyse */
        if (result) {
                if (!cptr[0])
                        goto trans;

                regs[0] = mfspr(SPRN_TAR);
                regs[1] = mfspr(SPRN_PPR);
                regs[2] = mfspr(SPRN_DSCR);

                shmdt(&cptr);
                printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
                                user_read, regs[0], regs[1], regs[2]);

                ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
                if (ret)
                        exit(1);
                exit(0);
        }
        shmdt(&cptr);
        exit(1);
}

int trace_tm_tar(pid_t child)
{
        unsigned long regs[3];

        FAIL_IF(start_trace(child));
        FAIL_IF(show_tar_registers(child, regs));
        printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
                        ptrace_read_running, regs[0], regs[1], regs[2]);

        FAIL_IF(validate_tar_registers(regs, TAR_2, PPR_2, DSCR_2));
        FAIL_IF(show_tm_checkpointed_state(child, regs));
        printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
                        ptrace_read_ckpt, regs[0], regs[1], regs[2]);

        FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
        FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
        printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
                        ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);

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

int ptrace_tm_tar(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)
                tm_tar();

        pptr = (unsigned long *)shmat(shm_id, NULL, 0);
        pptr[0] = 0;

        if (pid) {
                while (!pptr[1])
                        asm volatile("" : : : "memory");
                ret = trace_tm_tar(pid);
                if (ret) {
                        kill(pid, SIGTERM);
                        shmdt(&pptr);
                        shmctl(shm_id, IPC_RMID, NULL);
                        return TEST_FAIL;
                }
                shmdt(&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_tar, "ptrace_tm_tar");
}