mirror of
https://github.com/qemu/qemu.git
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d2bfb39ad2
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1044 c046a42c-6fe2-441c-8c8c-71466251a162
500 lines
11 KiB
C
500 lines
11 KiB
C
/*
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* QEMU low level functions
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "cpu.h"
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#if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)
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#include <sys/mman.h>
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#include <sys/ipc.h>
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/* When not using soft mmu, libc independant functions are needed for
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the CPU core because it needs to use alternates stacks and
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libc/thread incompatibles settings */
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#include <linux/unistd.h>
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#define QEMU_SYSCALL0(name) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name)); \
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return __res; \
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}
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#define QEMU_SYSCALL1(name,arg1) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name),"b" ((long)(arg1))); \
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return __res; \
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}
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#define QEMU_SYSCALL2(name,arg1,arg2) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
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return __res; \
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}
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#define QEMU_SYSCALL3(name,arg1,arg2,arg3) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
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"d" ((long)(arg3))); \
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return __res; \
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}
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#define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
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"d" ((long)(arg3)),"S" ((long)(arg4))); \
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return __res; \
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}
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#define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \
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{ \
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long __res; \
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__asm__ volatile ("int $0x80" \
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: "=a" (__res) \
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: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
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"d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
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return __res; \
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}
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#define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
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{ \
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long __res; \
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__asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
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: "=a" (__res) \
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: "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
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"d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
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"0" ((long)(arg6))); \
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return __res; \
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}
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int qemu_write(int fd, const void *buf, size_t n)
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{
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QEMU_SYSCALL3(write, fd, buf, n);
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}
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/****************************************************************/
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/* shmat replacement */
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int qemu_ipc(int call, unsigned long first,
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unsigned long second, unsigned long third,
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void *ptr, unsigned long fifth)
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{
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QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);
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}
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#define SHMAT 21
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/* we must define shmat so that a specific address will be used when
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mapping the X11 ximage */
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void *shmat(int shmid, const void *shmaddr, int shmflg)
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{
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void *ptr;
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int ret;
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/* we give an address in the right memory area */
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if (!shmaddr)
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shmaddr = get_mmap_addr(8192 * 1024);
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ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);
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if (ret < 0)
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return NULL;
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return ptr;
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}
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/****************************************************************/
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/* sigaction bypassing the threads */
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static int kernel_sigaction(int signum, const struct qemu_sigaction *act,
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struct qemu_sigaction *oldact,
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int sigsetsize)
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{
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QEMU_SYSCALL4(rt_sigaction, signum, act, oldact, sigsetsize);
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}
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int qemu_sigaction(int signum, const struct qemu_sigaction *act,
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struct qemu_sigaction *oldact)
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{
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return kernel_sigaction(signum, act, oldact, 8);
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}
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/****************************************************************/
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/* memory allocation */
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//#define DEBUG_MALLOC
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#define MALLOC_BASE 0xab000000
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#define PHYS_RAM_BASE 0xac000000
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#define MALLOC_ALIGN 16
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#define BLOCK_HEADER_SIZE 16
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typedef struct MemoryBlock {
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struct MemoryBlock *next;
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unsigned long size; /* size of block, including header */
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} MemoryBlock;
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static MemoryBlock *first_free_block;
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static unsigned long malloc_addr = MALLOC_BASE;
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static void *malloc_get_space(size_t size)
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{
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void *ptr;
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size = TARGET_PAGE_ALIGN(size);
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ptr = mmap((void *)malloc_addr, size,
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PROT_WRITE | PROT_READ,
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MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
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if (ptr == MAP_FAILED)
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return NULL;
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malloc_addr += size;
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return ptr;
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}
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void *qemu_malloc(size_t size)
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{
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MemoryBlock *mb, *mb1, **pmb;
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void *ptr;
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size_t size1, area_size;
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if (size == 0)
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return NULL;
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size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
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pmb = &first_free_block;
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for(;;) {
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mb = *pmb;
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if (mb == NULL)
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break;
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if (size <= mb->size)
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goto found;
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pmb = &mb->next;
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}
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/* no big enough blocks found: get new space */
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area_size = TARGET_PAGE_ALIGN(size);
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mb = malloc_get_space(area_size);
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if (!mb)
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return NULL;
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size1 = area_size - size;
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if (size1 > 0) {
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/* create a new free block */
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mb1 = (MemoryBlock *)((uint8_t *)mb + size);
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mb1->next = NULL;
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mb1->size = size1;
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*pmb = mb1;
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}
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goto the_end;
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found:
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/* a free block was found: use it */
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size1 = mb->size - size;
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if (size1 > 0) {
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/* create a new free block */
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mb1 = (MemoryBlock *)((uint8_t *)mb + size);
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mb1->next = mb->next;
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mb1->size = size1;
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*pmb = mb1;
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} else {
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/* suppress the first block */
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*pmb = mb->next;
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}
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the_end:
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mb->size = size;
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mb->next = NULL;
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ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
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#ifdef DEBUG_MALLOC
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qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
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#endif
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return ptr;
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}
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void qemu_free(void *ptr)
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{
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MemoryBlock *mb;
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if (!ptr)
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return;
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mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
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mb->next = first_free_block;
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first_free_block = mb;
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}
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/****************************************************************/
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/* virtual memory allocation */
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unsigned long mmap_addr = PHYS_RAM_BASE;
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void *get_mmap_addr(unsigned long size)
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{
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unsigned long addr;
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addr = mmap_addr;
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mmap_addr += ((size + 4095) & ~4095) + 4096;
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return (void *)addr;
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}
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#else
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int qemu_write(int fd, const void *buf, size_t n)
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{
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int ret;
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ret = write(fd, buf, n);
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if (ret < 0)
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return -errno;
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else
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return ret;
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}
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void *get_mmap_addr(unsigned long size)
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{
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return NULL;
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}
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void qemu_free(void *ptr)
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{
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free(ptr);
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}
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void *qemu_malloc(size_t size)
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{
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return malloc(size);
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}
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#endif
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void *qemu_mallocz(size_t size)
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{
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void *ptr;
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ptr = qemu_malloc(size);
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if (!ptr)
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return NULL;
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memset(ptr, 0, size);
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return ptr;
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}
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char *qemu_strdup(const char *str)
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{
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char *ptr;
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ptr = qemu_malloc(strlen(str) + 1);
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if (!ptr)
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return NULL;
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strcpy(ptr, str);
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return ptr;
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}
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/****************************************************************/
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/* printf support */
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static inline int qemu_isdigit(int c)
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{
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return c >= '0' && c <= '9';
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}
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#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
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/* from BSD ppp sources */
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int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
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{
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int c, i, n;
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int width, prec, fillch;
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int base, len, neg;
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unsigned long val = 0;
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const char *f;
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char *str, *buf0;
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char num[32];
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static const char hexchars[] = "0123456789abcdef";
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buf0 = buf;
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--buflen;
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while (buflen > 0) {
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for (f = fmt; *f != '%' && *f != 0; ++f)
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;
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if (f > fmt) {
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len = f - fmt;
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if (len > buflen)
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len = buflen;
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memcpy(buf, fmt, len);
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buf += len;
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buflen -= len;
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fmt = f;
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}
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if (*fmt == 0)
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break;
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c = *++fmt;
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width = prec = 0;
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fillch = ' ';
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if (c == '0') {
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fillch = '0';
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c = *++fmt;
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}
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if (c == '*') {
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width = va_arg(args, int);
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c = *++fmt;
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} else {
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while (qemu_isdigit(c)) {
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width = width * 10 + c - '0';
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c = *++fmt;
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}
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}
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if (c == '.') {
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c = *++fmt;
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if (c == '*') {
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prec = va_arg(args, int);
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c = *++fmt;
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} else {
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while (qemu_isdigit(c)) {
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prec = prec * 10 + c - '0';
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c = *++fmt;
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}
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}
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}
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/* modifiers */
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switch(c) {
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case 'l':
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c = *++fmt;
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break;
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default:
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break;
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}
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str = 0;
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base = 0;
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neg = 0;
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++fmt;
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switch (c) {
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case 'd':
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i = va_arg(args, int);
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if (i < 0) {
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neg = 1;
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val = -i;
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} else
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val = i;
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base = 10;
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break;
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case 'o':
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val = va_arg(args, unsigned int);
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base = 8;
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break;
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case 'x':
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case 'X':
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val = va_arg(args, unsigned int);
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base = 16;
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break;
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case 'p':
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val = (unsigned long) va_arg(args, void *);
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base = 16;
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neg = 2;
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break;
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case 's':
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str = va_arg(args, char *);
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break;
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case 'c':
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num[0] = va_arg(args, int);
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num[1] = 0;
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str = num;
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break;
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default:
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*buf++ = '%';
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if (c != '%')
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--fmt; /* so %z outputs %z etc. */
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--buflen;
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continue;
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}
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if (base != 0) {
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str = num + sizeof(num);
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*--str = 0;
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while (str > num + neg) {
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*--str = hexchars[val % base];
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val = val / base;
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if (--prec <= 0 && val == 0)
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break;
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}
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switch (neg) {
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case 1:
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*--str = '-';
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break;
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case 2:
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*--str = 'x';
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*--str = '0';
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break;
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}
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len = num + sizeof(num) - 1 - str;
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} else {
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len = strlen(str);
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if (prec > 0 && len > prec)
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len = prec;
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}
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if (width > 0) {
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if (width > buflen)
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width = buflen;
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if ((n = width - len) > 0) {
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buflen -= n;
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for (; n > 0; --n)
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*buf++ = fillch;
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}
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}
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if (len > buflen)
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len = buflen;
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memcpy(buf, str, len);
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buf += len;
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buflen -= len;
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}
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*buf = 0;
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return buf - buf0;
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}
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void qemu_vprintf(const char *fmt, va_list ap)
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{
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char buf[1024];
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int len;
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len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
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qemu_write(1, buf, len);
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}
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void qemu_printf(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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qemu_vprintf(fmt, ap);
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va_end(ap);
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}
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