Archipelago » qemu

/*

 * QTest

 *

 * Copyright IBM, Corp. 2012

 * Copyright Red Hat, Inc. 2012

 * Copyright SUSE LINUX Products GmbH 2013

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *  Paolo Bonzini     <pbonzini@redhat.com>

 *  Andreas Färber    <afaerber@suse.de>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 */

#include "libqtest.h"

#include <glib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <sys/un.h>

#include <inttypes.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include "qemu/compiler.h"

#include "qemu/osdep.h"

#define MAX_IRQ 256

QTestState *global_qtest;

struct QTestState

{

    int fd;

    int qmp_fd;

    bool irq_level[MAX_IRQ];

    GString *rx;

    gchar *pid_file; /* QEMU PID file */

    int child_pid;   /* Child process created to execute QEMU */

    char *socket_path, *qmp_socket_path;

};

#define g_assert_no_errno(ret) do { \

    g_assert_cmpint(ret, !=, -1); \

} while (0)

static int init_socket(const char *socket_path)

{

    struct sockaddr_un addr;

    int sock;

    int ret;

    sock = socket(PF_UNIX, SOCK_STREAM, 0);

    g_assert_no_errno(sock);

    addr.sun_family = AF_UNIX;

    snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", socket_path);

    qemu_set_cloexec(sock);

    do {

        ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));

    } while (ret == -1 && errno == EINTR);

    g_assert_no_errno(ret);

    listen(sock, 1);

    return sock;

}

static int socket_accept(int sock)

{

    struct sockaddr_un addr;

    socklen_t addrlen;

    int ret;

    addrlen = sizeof(addr);

    do {

        ret = accept(sock, (struct sockaddr *)&addr, &addrlen);

    } while (ret == -1 && errno == EINTR);

    g_assert_no_errno(ret);

    close(sock);

    return ret;

}

static pid_t qtest_qemu_pid(QTestState *s)

{

    FILE *f;

    char buffer[1024];

    pid_t pid = -1;

    f = fopen(s->pid_file, "r");

    if (f) {

        if (fgets(buffer, sizeof(buffer), f)) {

            pid = atoi(buffer);

        }

    }

    fclose(f);

    return pid;

}

QTestState *qtest_init(const char *extra_args)

{

    QTestState *s;

    int sock, qmpsock, ret, i;

    gchar *pid_file;

    gchar *command;

    const char *qemu_binary;

    pid_t pid;

    qemu_binary = getenv("QTEST_QEMU_BINARY");

    g_assert(qemu_binary != NULL);

    s = g_malloc(sizeof(*s));

    s->socket_path = g_strdup_printf("/tmp/qtest-%d.sock", getpid());

    s->qmp_socket_path = g_strdup_printf("/tmp/qtest-%d.qmp", getpid());

    pid_file = g_strdup_printf("/tmp/qtest-%d.pid", getpid());

    sock = init_socket(s->socket_path);

    qmpsock = init_socket(s->qmp_socket_path);

    pid = fork();

    if (pid == 0) {

        command = g_strdup_printf("%s "

                                  "-qtest unix:%s,nowait "

                                  "-qtest-log /dev/null "

                                  "-qmp unix:%s,nowait "

                                  "-pidfile %s "

                                  "-machine accel=qtest "

                                  "%s", qemu_binary, s->socket_path,

                                  s->qmp_socket_path, pid_file,

                                  extra_args ?: "");

        ret = system(command);

        exit(ret);

        g_free(command);

    }

    s->fd = socket_accept(sock);

    s->qmp_fd = socket_accept(qmpsock);

    s->rx = g_string_new("");

    s->pid_file = pid_file;

    s->child_pid = pid;

    for (i = 0; i < MAX_IRQ; i++) {

        s->irq_level[i] = false;

    }

    /* Read the QMP greeting and then do the handshake */

    qtest_qmp(s, "");

    qtest_qmp(s, "{ 'execute': 'qmp_capabilities' }");

    if (getenv("QTEST_STOP")) {

        kill(qtest_qemu_pid(s), SIGSTOP);

    }

    return s;

}

void qtest_quit(QTestState *s)

{

    int status;

    pid_t pid = qtest_qemu_pid(s);

    if (pid != -1) {

        /* kill QEMU, but wait for the child created by us to run system() */

        kill(pid, SIGTERM);

        waitpid(s->child_pid, &status, 0);

    }

    unlink(s->pid_file);

    unlink(s->socket_path);

    unlink(s->qmp_socket_path);

    g_free(s->pid_file);

    g_free(s->socket_path);

    g_free(s->qmp_socket_path);

}

static void socket_sendf(int fd, const char *fmt, va_list ap)

{

    gchar *str;

    size_t size, offset;

    str = g_strdup_vprintf(fmt, ap);

    size = strlen(str);

    offset = 0;

    while (offset < size) {

        ssize_t len;

        len = write(fd, str + offset, size - offset);

        if (len == -1 && errno == EINTR) {

            continue;

        }

        g_assert_no_errno(len);

        g_assert_cmpint(len, >, 0);

        offset += len;

    }

}

static void GCC_FMT_ATTR(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    socket_sendf(s->fd, fmt, ap);

    va_end(ap);

}

static GString *qtest_recv_line(QTestState *s)

{

    GString *line;

    size_t offset;

    char *eol;

    while ((eol = strchr(s->rx->str, '\n')) == NULL) {

        ssize_t len;

        char buffer[1024];

        len = read(s->fd, buffer, sizeof(buffer));

        if (len == -1 && errno == EINTR) {

            continue;

        }

        if (len == -1 || len == 0) {

            fprintf(stderr, "Broken pipe\n");

            exit(1);

        }

        g_string_append_len(s->rx, buffer, len);

    }

    offset = eol - s->rx->str;

    line = g_string_new_len(s->rx->str, offset);

    g_string_erase(s->rx, 0, offset + 1);

    return line;

}

static gchar **qtest_rsp(QTestState *s, int expected_args)

{

    GString *line;

    gchar **words;

    int i;

redo:

    line = qtest_recv_line(s);

    words = g_strsplit(line->str, " ", 0);

    g_string_free(line, TRUE);

    if (strcmp(words[0], "IRQ") == 0) {

        int irq;

        g_assert(words[1] != NULL);

        g_assert(words[2] != NULL);

        irq = strtoul(words[2], NULL, 0);

        g_assert_cmpint(irq, >=, 0);

        g_assert_cmpint(irq, <, MAX_IRQ);

        if (strcmp(words[1], "raise") == 0) {

            s->irq_level[irq] = true;

        } else {

            s->irq_level[irq] = false;

        }

        g_strfreev(words);

        goto redo;

    }

    g_assert(words[0] != NULL);

    g_assert_cmpstr(words[0], ==, "OK");

    if (expected_args) {

        for (i = 0; i < expected_args; i++) {

            g_assert(words[i] != NULL);

        }

    } else {

        g_strfreev(words);

    }

    return words;

}

void qtest_qmpv(QTestState *s, const char *fmt, va_list ap)

{

    bool has_reply = false;

    int nesting = 0;

    /* Send QMP request */

    socket_sendf(s->qmp_fd, fmt, ap);

    /* Receive reply */

    while (!has_reply || nesting > 0) {

        ssize_t len;

        char c;

        len = read(s->qmp_fd, &c, 1);

        if (len == -1 && errno == EINTR) {

            continue;

        }

        if (len == -1 || len == 0) {

            fprintf(stderr, "Broken pipe\n");

            exit(1);

        }

        switch (c) {

        case '{':

            nesting++;

            has_reply = true;

            break;

        case '}':

            nesting--;

            break;

        }

    }

}

void qtest_qmp(QTestState *s, const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    qtest_qmpv(s, fmt, ap);

    va_end(ap);

}

const char *qtest_get_arch(void)

{

    const char *qemu = getenv("QTEST_QEMU_BINARY");

    const char *end = strrchr(qemu, '/');

    return end + strlen("/qemu-system-");

}

bool qtest_get_irq(QTestState *s, int num)

{

    /* dummy operation in order to make sure irq is up to date */

    qtest_inb(s, 0);

    return s->irq_level[num];

}

static int64_t qtest_clock_rsp(QTestState *s)

{

    gchar **words;

    int64_t clock;

    words = qtest_rsp(s, 2);

    clock = g_ascii_strtoll(words[1], NULL, 0);

    g_strfreev(words);

    return clock;

}

int64_t qtest_clock_step_next(QTestState *s)

{

    qtest_sendf(s, "clock_step\n");

    return qtest_clock_rsp(s);

}

int64_t qtest_clock_step(QTestState *s, int64_t step)

{

    qtest_sendf(s, "clock_step %"PRIi64"\n", step);

    return qtest_clock_rsp(s);

}

int64_t qtest_clock_set(QTestState *s, int64_t val)

{

    qtest_sendf(s, "clock_set %"PRIi64"\n", val);

    return qtest_clock_rsp(s);

}

void qtest_irq_intercept_out(QTestState *s, const char *qom_path)

{

    qtest_sendf(s, "irq_intercept_out %s\n", qom_path);

    qtest_rsp(s, 0);

}

void qtest_irq_intercept_in(QTestState *s, const char *qom_path)

{

    qtest_sendf(s, "irq_intercept_in %s\n", qom_path);

    qtest_rsp(s, 0);

}

static void qtest_out(QTestState *s, const char *cmd, uint16_t addr, uint32_t value)

{

    qtest_sendf(s, "%s 0x%x 0x%x\n", cmd, addr, value);

    qtest_rsp(s, 0);

}

void qtest_outb(QTestState *s, uint16_t addr, uint8_t value)

{

    qtest_out(s, "outb", addr, value);

}

void qtest_outw(QTestState *s, uint16_t addr, uint16_t value)

{

    qtest_out(s, "outw", addr, value);

}

void qtest_outl(QTestState *s, uint16_t addr, uint32_t value)

{

    qtest_out(s, "outl", addr, value);

}

static uint32_t qtest_in(QTestState *s, const char *cmd, uint16_t addr)

{

    gchar **args;

    uint32_t value;

    qtest_sendf(s, "%s 0x%x\n", cmd, addr);

    args = qtest_rsp(s, 2);

    value = strtoul(args[1], NULL, 0);

    g_strfreev(args);

    return value;

}

uint8_t qtest_inb(QTestState *s, uint16_t addr)

{

    return qtest_in(s, "inb", addr);

}

uint16_t qtest_inw(QTestState *s, uint16_t addr)

{

    return qtest_in(s, "inw", addr);

}

uint32_t qtest_inl(QTestState *s, uint16_t addr)

{

    return qtest_in(s, "inl", addr);

}

static void qtest_write(QTestState *s, const char *cmd, uint64_t addr,

                        uint64_t value)

{

    qtest_sendf(s, "%s 0x%" PRIx64 " 0x%" PRIx64 "\n", cmd, addr, value);

    qtest_rsp(s, 0);

}

void qtest_writeb(QTestState *s, uint64_t addr, uint8_t value)

{

    qtest_write(s, "writeb", addr, value);

}

void qtest_writew(QTestState *s, uint64_t addr, uint16_t value)

{

    qtest_write(s, "writew", addr, value);

}

void qtest_writel(QTestState *s, uint64_t addr, uint32_t value)

{

    qtest_write(s, "writel", addr, value);

}

void qtest_writeq(QTestState *s, uint64_t addr, uint64_t value)

{

    qtest_write(s, "writeq", addr, value);

}

static uint64_t qtest_read(QTestState *s, const char *cmd, uint64_t addr)

{

    gchar **args;

    uint64_t value;

    qtest_sendf(s, "%s 0x%" PRIx64 "\n", cmd, addr);

    args = qtest_rsp(s, 2);

    value = strtoull(args[1], NULL, 0);

    g_strfreev(args);

    return value;

}

uint8_t qtest_readb(QTestState *s, uint64_t addr)

{

    return qtest_read(s, "readb", addr);

}

uint16_t qtest_readw(QTestState *s, uint64_t addr)

{

    return qtest_read(s, "readw", addr);

}

uint32_t qtest_readl(QTestState *s, uint64_t addr)

{

    return qtest_read(s, "readl", addr);

}

uint64_t qtest_readq(QTestState *s, uint64_t addr)

{

    return qtest_read(s, "readq", addr);

}

static int hex2nib(char ch)

{

    if (ch >= '0' && ch <= '9') {

        return ch - '0';

    } else if (ch >= 'a' && ch <= 'f') {

        return 10 + (ch - 'a');

    } else if (ch >= 'A' && ch <= 'F') {

        return 10 + (ch - 'a');

    } else {

        return -1;

    }

}

void qtest_memread(QTestState *s, uint64_t addr, void *data, size_t size)

{

    uint8_t *ptr = data;

    gchar **args;

    size_t i;

    qtest_sendf(s, "read 0x%" PRIx64 " 0x%zx\n", addr, size);

    args = qtest_rsp(s, 2);

    for (i = 0; i < size; i++) {

        ptr[i] = hex2nib(args[1][2 + (i * 2)]) << 4;

        ptr[i] |= hex2nib(args[1][2 + (i * 2) + 1]);

    }

    g_strfreev(args);

}

void qtest_add_func(const char *str, void (*fn))

{

    gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);

    g_test_add_func(path, fn);

}

void qtest_memwrite(QTestState *s, uint64_t addr, const void *data, size_t size)

{

    const uint8_t *ptr = data;

    size_t i;

    qtest_sendf(s, "write 0x%" PRIx64 " 0x%zx 0x", addr, size);

    for (i = 0; i < size; i++) {

        qtest_sendf(s, "%02x", ptr[i]);

    }

    qtest_sendf(s, "\n");

    qtest_rsp(s, 0);

}