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/*
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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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} |
359 |
if (*fmt == 0) |
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break;
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c = *++fmt; |
362 |
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; |
367 |
} |
368 |
if (c == '*') { |
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width = va_arg(args, int);
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c = *++fmt; |
371 |
} else {
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while (qemu_isdigit(c)) {
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width = width * 10 + c - '0'; |
374 |
c = *++fmt; |
375 |
} |
376 |
} |
377 |
if (c == '.') { |
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c = *++fmt; |
379 |
if (c == '*') { |
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prec = va_arg(args, int);
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c = *++fmt; |
382 |
} else {
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while (qemu_isdigit(c)) {
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prec = prec * 10 + c - '0'; |
385 |
c = *++fmt; |
386 |
} |
387 |
} |
388 |
} |
389 |
/* modifiers */
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switch(c) {
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case 'l': |
392 |
c = *++fmt; |
393 |
break;
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default:
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break;
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} |
397 |
str = 0;
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base = 0;
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neg = 0;
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++fmt; |
401 |
switch (c) {
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case 'd': |
403 |
i = va_arg(args, int);
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if (i < 0) { |
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neg = 1;
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val = -i; |
407 |
} else
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val = i; |
409 |
base = 10;
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break;
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case 'o': |
412 |
val = va_arg(args, unsigned int); |
413 |
base = 8;
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break;
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case 'x': |
416 |
case 'X': |
417 |
val = va_arg(args, unsigned int); |
418 |
base = 16;
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break;
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420 |
case 'p': |
421 |
val = (unsigned long) va_arg(args, void *); |
422 |
base = 16;
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neg = 2;
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break;
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case 's': |
426 |
str = va_arg(args, char *);
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break;
|
428 |
case 'c': |
429 |
num[0] = va_arg(args, int); |
430 |
num[1] = 0; |
431 |
str = num; |
432 |
break;
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433 |
default:
|
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*buf++ = '%';
|
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if (c != '%') |
436 |
--fmt; /* so %z outputs %z etc. */
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--buflen; |
438 |
continue;
|
439 |
} |
440 |
if (base != 0) { |
441 |
str = num + sizeof(num);
|
442 |
*--str = 0;
|
443 |
while (str > num + neg) {
|
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*--str = hexchars[val % base]; |
445 |
val = val / base; |
446 |
if (--prec <= 0 && val == 0) |
447 |
break;
|
448 |
} |
449 |
switch (neg) {
|
450 |
case 1: |
451 |
*--str = '-';
|
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break;
|
453 |
case 2: |
454 |
*--str = 'x';
|
455 |
*--str = '0';
|
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break;
|
457 |
} |
458 |
len = num + sizeof(num) - 1 - str; |
459 |
} else {
|
460 |
len = strlen(str); |
461 |
if (prec > 0 && len > prec) |
462 |
len = prec; |
463 |
} |
464 |
if (width > 0) { |
465 |
if (width > buflen)
|
466 |
width = buflen; |
467 |
if ((n = width - len) > 0) { |
468 |
buflen -= n; |
469 |
for (; n > 0; --n) |
470 |
*buf++ = fillch; |
471 |
} |
472 |
} |
473 |
if (len > buflen)
|
474 |
len = buflen; |
475 |
memcpy(buf, str, len); |
476 |
buf += len; |
477 |
buflen -= len; |
478 |
} |
479 |
*buf = 0;
|
480 |
return buf - buf0;
|
481 |
} |
482 |
|
483 |
void qemu_vprintf(const char *fmt, va_list ap) |
484 |
{ |
485 |
char buf[1024]; |
486 |
int len;
|
487 |
|
488 |
len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
|
489 |
qemu_write(1, buf, len);
|
490 |
} |
491 |
|
492 |
void qemu_printf(const char *fmt, ...) |
493 |
{ |
494 |
va_list ap; |
495 |
va_start(ap, fmt); |
496 |
qemu_vprintf(fmt, ap); |
497 |
va_end(ap); |
498 |
} |
499 |
|