Archipelago » qemu

/*

 * QEMU low level functions

 * 

 * Copyright (c) 2003 Fabrice Bellard

 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <stdlib.h>

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include "cpu.h"

#if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)

#include <sys/mman.h>

#include <sys/ipc.h>

/* When not using soft mmu, libc independant functions are needed for

   the CPU core because it needs to use alternates stacks and

   libc/thread incompatibles settings */

#include <linux/unistd.h>

#define QEMU_SYSCALL0(name) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name)); \

return __res; \

}

#define QEMU_SYSCALL1(name,arg1) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name),"b" ((long)(arg1))); \

return __res; \

}

#define QEMU_SYSCALL2(name,arg1,arg2) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \

return __res; \

}

#define QEMU_SYSCALL3(name,arg1,arg2,arg3) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \

                  "d" ((long)(arg3))); \

return __res; \

}

#define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \

          "d" ((long)(arg3)),"S" ((long)(arg4))); \

return __res; \

} 

#define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \

{ \

long __res; \

__asm__ volatile ("int $0x80" \

        : "=a" (__res) \

        : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \

          "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \

return __res; \

}

#define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \

{ \

long __res; \

__asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \

        : "=a" (__res) \

        : "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \

          "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \

          "0" ((long)(arg6))); \

return __res; \

}

int qemu_write(int fd, const void *buf, size_t n)

{

    QEMU_SYSCALL3(write, fd, buf, n);

}

/****************************************************************/

/* shmat replacement */

int qemu_ipc(int call, unsigned long first, 

            unsigned long second, unsigned long third, 

            void *ptr, unsigned long fifth)

{

    QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);

}

#define SHMAT 21

/* we must define shmat so that a specific address will be used when

   mapping the X11 ximage */

void *shmat(int shmid, const void *shmaddr, int shmflg)

{

    void *ptr;

    int ret;

    /* we give an address in the right memory area */

    if (!shmaddr)

        shmaddr = get_mmap_addr(8192 * 1024);

    ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);

    if (ret < 0)

        return NULL;

    return ptr;

}

/****************************************************************/

/* sigaction bypassing the threads */

static int kernel_sigaction(int signum, const struct qemu_sigaction *act, 

                            struct qemu_sigaction *oldact, 

                            int sigsetsize)

{

    QEMU_SYSCALL4(rt_sigaction, signum, act, oldact, sigsetsize);

}

int qemu_sigaction(int signum, const struct qemu_sigaction *act, 

                   struct qemu_sigaction *oldact)

{

    return kernel_sigaction(signum, act, oldact, 8);

}

/****************************************************************/

/* memory allocation */

//#define DEBUG_MALLOC

#define MALLOC_BASE       0xab000000

#define PHYS_RAM_BASE     0xac000000

#define MALLOC_ALIGN      16

#define BLOCK_HEADER_SIZE 16

typedef struct MemoryBlock {

    struct MemoryBlock *next;

    unsigned long size; /* size of block, including header */

} MemoryBlock;

static MemoryBlock *first_free_block;

static unsigned long malloc_addr = MALLOC_BASE;

static void *malloc_get_space(size_t size)

{

    void *ptr;

    size = TARGET_PAGE_ALIGN(size);

    ptr = mmap((void *)malloc_addr, size, 

               PROT_WRITE | PROT_READ, 

               MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);

    if (ptr == MAP_FAILED)

        return NULL;

    malloc_addr += size;

    return ptr;

}

void *qemu_malloc(size_t size)

{

    MemoryBlock *mb, *mb1, **pmb;

    void *ptr;

    size_t size1, area_size;

    if (size == 0)

        return NULL;

    size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);

    pmb = &first_free_block;

    for(;;) {

        mb = *pmb;

        if (mb == NULL)

            break;

        if (size <= mb->size)

            goto found;

        pmb = &mb->next;

    }

    /* no big enough blocks found: get new space */

    area_size = TARGET_PAGE_ALIGN(size);

    mb = malloc_get_space(area_size);

    if (!mb)

        return NULL;

    size1 = area_size - size;

    if (size1 > 0) {

        /* create a new free block */

        mb1 = (MemoryBlock *)((uint8_t *)mb + size);

        mb1->next = NULL;

        mb1->size = size1;

        *pmb = mb1;

    }

    goto the_end;

 found:

    /* a free block was found: use it */

    size1 = mb->size - size;

    if (size1 > 0) {

        /* create a new free block */

        mb1 = (MemoryBlock *)((uint8_t *)mb + size);

        mb1->next = mb->next;

        mb1->size = size1;

        *pmb = mb1;

    } else {

        /* suppress the first block */

        *pmb = mb->next;

    }

 the_end:

    mb->size = size;

    mb->next = NULL;

    ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);

#ifdef DEBUG_MALLOC

    qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);

#endif

    return ptr;

}

void qemu_free(void *ptr)

{

    MemoryBlock *mb;

    if (!ptr)

        return;

    mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);

    mb->next = first_free_block;

    first_free_block = mb;

}

/****************************************************************/

/* virtual memory allocation */

unsigned long mmap_addr = PHYS_RAM_BASE;

void *get_mmap_addr(unsigned long size)

{

    unsigned long addr;

    addr = mmap_addr;

    mmap_addr += ((size + 4095) & ~4095) + 4096;

    return (void *)addr;

}

#else

#ifdef _WIN32

#include <windows.h>

#elif defined(_BSD)

#include <stdlib.h>

#else

#include <malloc.h>

#endif

int qemu_write(int fd, const void *buf, size_t n)

{

    int ret;

    ret = write(fd, buf, n);

    if (ret < 0)

        return -errno;

    else

        return ret;

}

void *get_mmap_addr(unsigned long size)

{

    return NULL;

}

void qemu_free(void *ptr)

{

    free(ptr);

}

void *qemu_malloc(size_t size)

{

    return malloc(size);

}

#if defined(_WIN32)

void *qemu_vmalloc(size_t size)

{

    /* FIXME: this is not exactly optimal solution since VirtualAlloc

       has 64Kb granularity, but at least it guarantees us that the

       memory is page aligned. */

    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);

}

void qemu_vfree(void *ptr)

{

    VirtualFree(ptr, 0, MEM_RELEASE);

}

#elif defined(USE_KQEMU)

#include <sys/vfs.h>

#include <sys/mman.h>

#include <fcntl.h>

void *qemu_vmalloc(size_t size)

{

    static int phys_ram_fd = -1;

    static int phys_ram_size = 0;

    const char *tmpdir;

    char phys_ram_file[1024];

    void *ptr;

    struct statfs stfs;

    if (phys_ram_fd < 0) {

        tmpdir = getenv("QEMU_TMPDIR");

        if (!tmpdir)

            tmpdir = "/dev/shm";

        if (statfs(tmpdir, &stfs) == 0) {

            int64_t free_space;

            int ram_mb;

            extern int ram_size;

            free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;

            if ((ram_size + 8192 * 1024) >= free_space) {

                ram_mb = (ram_size / (1024 * 1024));

                fprintf(stderr, 

                        "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",

                        tmpdir, ram_mb);

                if (strcmp(tmpdir, "/dev/shm") == 0) {

                    fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"

                            "umount /dev/shm\n"

                            "mount -t tmpfs -o size=%dm none /dev/shm\n",

                            ram_mb + 16);

                } else {

                    fprintf(stderr, 

                            "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"

                            "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"

                            "temporary RAM file will be opened.\n");

                }

                exit(1);

            }

        }

        snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", 

                 tmpdir);

        if (mkstemp(phys_ram_file) < 0) {

            fprintf(stderr, 

                    "warning: could not create temporary file in '%s'.\n"

                    "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"

                    "Using '/tmp' as fallback.\n",

                    tmpdir);

            snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", 

                     "/tmp");

            if (mkstemp(phys_ram_file) < 0) {

                fprintf(stderr, "Could not create temporary memory file '%s'\n", 

                        phys_ram_file);

                exit(1);

            }

        }

        phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);

        if (phys_ram_fd < 0) {

            fprintf(stderr, "Could not open temporary memory file '%s'\n", 

                    phys_ram_file);

            exit(1);

        }

        unlink(phys_ram_file);

    }

    size = (size + 4095) & ~4095;

    ftruncate(phys_ram_fd, phys_ram_size + size);

    ptr = mmap(NULL, 

               size, 

               PROT_WRITE | PROT_READ, MAP_SHARED, 

               phys_ram_fd, phys_ram_size);

    if (ptr == MAP_FAILED) {

        fprintf(stderr, "Could not map physical memory\n");

        exit(1);

    }

    phys_ram_size += size;

    return ptr;

}

void qemu_vfree(void *ptr)

{

    /* may be useful some day, but currently we do not need to free */

}

#else

/* alloc shared memory pages */

void *qemu_vmalloc(size_t size)

{

#ifdef _BSD

    return valloc(size);

#else

    return memalign(4096, size);

#endif

}

void qemu_vfree(void *ptr)

{

    free(ptr);

}

#endif

#endif

void *qemu_mallocz(size_t size)

{

    void *ptr;

    ptr = qemu_malloc(size);

    if (!ptr)

        return NULL;

    memset(ptr, 0, size);

    return ptr;

}

char *qemu_strdup(const char *str)

{

    char *ptr;

    ptr = qemu_malloc(strlen(str) + 1);

    if (!ptr)

        return NULL;

    strcpy(ptr, str);

    return ptr;

}

/****************************************************************/

/* printf support */

static inline int qemu_isdigit(int c)

{

    return c >= '0' && c <= '9';

}

#define OUTCHAR(c)        (buflen > 0? (--buflen, *buf++ = (c)): 0)

/* from BSD ppp sources */

int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)

{

    int c, i, n;

    int width, prec, fillch;

    int base, len, neg;

    unsigned long val = 0;

    const char *f;

    char *str, *buf0;

    char num[32];

    static const char hexchars[] = "0123456789abcdef";

    buf0 = buf;

    --buflen;

    while (buflen > 0) {

        for (f = fmt; *f != '%' && *f != 0; ++f)

            ;

        if (f > fmt) {

            len = f - fmt;

            if (len > buflen)

                len = buflen;

            memcpy(buf, fmt, len);

            buf += len;

            buflen -= len;

            fmt = f;

        }

        if (*fmt == 0)

            break;

        c = *++fmt;

        width = prec = 0;

        fillch = ' ';

        if (c == '0') {

            fillch = '0';

            c = *++fmt;

        }

        if (c == '*') {

            width = va_arg(args, int);

            c = *++fmt;

        } else {

            while (qemu_isdigit(c)) {

                width = width * 10 + c - '0';

                c = *++fmt;

            }

        }

        if (c == '.') {

            c = *++fmt;

            if (c == '*') {

                prec = va_arg(args, int);

                c = *++fmt;

            } else {

                while (qemu_isdigit(c)) {

                    prec = prec * 10 + c - '0';

                    c = *++fmt;

                }

            }

        }

        /* modifiers */

        switch(c) {

        case 'l':

            c = *++fmt;

            break;

        default:

            break;

        }

        str = 0;

        base = 0;

        neg = 0;

        ++fmt;

        switch (c) {

        case 'd':

            i = va_arg(args, int);

            if (i < 0) {

                neg = 1;

                val = -i;

            } else

                val = i;

            base = 10;

            break;

        case 'o':

            val = va_arg(args, unsigned int);

            base = 8;

            break;

        case 'x':

        case 'X':

            val = va_arg(args, unsigned int);

            base = 16;

            break;

        case 'p':

            val = (unsigned long) va_arg(args, void *);

            base = 16;

            neg = 2;

            break;

        case 's':

            str = va_arg(args, char *);

            break;

        case 'c':

            num[0] = va_arg(args, int);

            num[1] = 0;

            str = num;

            break;

        default:

            *buf++ = '%';

            if (c != '%')

                --fmt;                /* so %z outputs %z etc. */

            --buflen;

            continue;

        }

        if (base != 0) {

            str = num + sizeof(num);

            *--str = 0;

            while (str > num + neg) {

                *--str = hexchars[val % base];

                val = val / base;

                if (--prec <= 0 && val == 0)

                    break;

            }

            switch (neg) {

            case 1:

                *--str = '-';

                break;

            case 2:

                *--str = 'x';

                *--str = '0';

                break;

            }

            len = num + sizeof(num) - 1 - str;

        } else {

            len = strlen(str);

            if (prec > 0 && len > prec)

                len = prec;

        }

        if (width > 0) {

            if (width > buflen)

                width = buflen;

            if ((n = width - len) > 0) {

                buflen -= n;

                for (; n > 0; --n)

                    *buf++ = fillch;

            }

        }

        if (len > buflen)

            len = buflen;

        memcpy(buf, str, len);

        buf += len;

        buflen -= len;

    }

    *buf = 0;

    return buf - buf0;

}

void qemu_vprintf(const char *fmt, va_list ap)

{

    char buf[1024];

    int len;

    len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);

    qemu_write(1, buf, len);

}

void qemu_printf(const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    qemu_vprintf(fmt, ap);

    va_end(ap);

}