diff options
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/elfload.c | 134 | ||||
| -rw-r--r-- | linux-user/main.c | 29 | ||||
| -rw-r--r-- | linux-user/mmap.c | 370 | ||||
| -rw-r--r-- | linux-user/qemu.h | 10 | ||||
| -rw-r--r-- | linux-user/syscall.c | 26 |
5 files changed, 470 insertions, 99 deletions
diff --git a/linux-user/elfload.c b/linux-user/elfload.c index edb3176bcb..5186e55623 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -95,8 +95,6 @@ struct exec #define ZMAGIC 0413 #define QMAGIC 0314 -#define X86_STACK_TOP 0x7d000000 - /* max code+data+bss space allocated to elf interpreter */ #define INTERP_MAP_SIZE (32 * 1024 * 1024) @@ -123,23 +121,11 @@ struct exec #define PER_XENIX (0x0007 | STICKY_TIMEOUTS) /* Necessary parameters */ -#define ALPHA_PAGE_SIZE 4096 -#define X86_PAGE_SIZE 4096 - -#define ALPHA_PAGE_MASK (~(ALPHA_PAGE_SIZE-1)) -#define X86_PAGE_MASK (~(X86_PAGE_SIZE-1)) - -#define ALPHA_PAGE_ALIGN(addr) ((((addr)+ALPHA_PAGE_SIZE)-1)&ALPHA_PAGE_MASK) -#define X86_PAGE_ALIGN(addr) ((((addr)+X86_PAGE_SIZE)-1)&X86_PAGE_MASK) - #define NGROUPS 32 -#define X86_ELF_EXEC_PAGESIZE X86_PAGE_SIZE -#define X86_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(X86_ELF_EXEC_PAGESIZE-1)) -#define X86_ELF_PAGEOFFSET(_v) ((_v) & (X86_ELF_EXEC_PAGESIZE-1)) - -#define ALPHA_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ALPHA_PAGE_SIZE-1)) -#define ALPHA_ELF_PAGEOFFSET(_v) ((_v) & (ALPHA_PAGE_SIZE-1)) +#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE +#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) +#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) #define INTERPRETER_NONE 0 #define INTERPRETER_AOUT 1 @@ -160,9 +146,6 @@ static inline void memcpy_tofs(void * to, const void * from, unsigned long n) memcpy(to, from, n); } -//extern void * mmap4k(); -#define mmap4k(a, b, c, d, e, f) mmap((void *)(a), b, c, d, e, f) - extern unsigned long x86_stack_size; static int load_aout_interp(void * exptr, int interp_fd); @@ -227,8 +210,8 @@ static void * get_free_page(void) /* User-space version of kernel get_free_page. Returns a page-aligned * page-sized chunk of memory. */ - retval = mmap4k(0, ALPHA_PAGE_SIZE, PROT_READ|PROT_WRITE, - MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); + retval = (void *)target_mmap(0, host_page_size, PROT_READ|PROT_WRITE, + MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); if((long)retval == -1) { perror("get_free_page"); @@ -241,7 +224,7 @@ static void * get_free_page(void) static void free_page(void * pageaddr) { - (void)munmap(pageaddr, ALPHA_PAGE_SIZE); + target_munmap((unsigned long)pageaddr, host_page_size); } /* @@ -272,9 +255,9 @@ static unsigned long copy_strings(int argc,char ** argv,unsigned long *page, while (len) { --p; --tmp; --len; if (--offset < 0) { - offset = p % X86_PAGE_SIZE; - if (!(pag = (char *) page[p/X86_PAGE_SIZE]) && - !(pag = (char *) page[p/X86_PAGE_SIZE] = + offset = p % TARGET_PAGE_SIZE; + if (!(pag = (char *) page[p/TARGET_PAGE_SIZE]) && + !(pag = (char *) page[p/TARGET_PAGE_SIZE] = (unsigned long *) get_free_page())) { return 0; } @@ -390,21 +373,21 @@ unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, * it for args, we'll use it for something else... */ size = x86_stack_size; - if (size < MAX_ARG_PAGES*X86_PAGE_SIZE) - size = MAX_ARG_PAGES*X86_PAGE_SIZE; - error = (unsigned long)mmap4k(NULL, - size + X86_PAGE_SIZE, - PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, - -1, 0); + if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) + size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; + error = target_mmap(0, + size + host_page_size, + PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, + -1, 0); if (error == -1) { perror("stk mmap"); exit(-1); } /* we reserve one extra page at the top of the stack as guard */ - mprotect((void *)(error + size), X86_PAGE_SIZE, PROT_NONE); + target_mprotect(error + size, host_page_size, PROT_NONE); - stack_base = error + size - MAX_ARG_PAGES*X86_PAGE_SIZE; + stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; p += stack_base; if (bprm->loader) { @@ -416,10 +399,10 @@ unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, if (bprm->page[i]) { info->rss++; - memcpy((void *)stack_base, (void *)bprm->page[i], X86_PAGE_SIZE); + memcpy((void *)stack_base, (void *)bprm->page[i], TARGET_PAGE_SIZE); free_page((void *)bprm->page[i]); } - stack_base += X86_PAGE_SIZE; + stack_base += TARGET_PAGE_SIZE; } return p; } @@ -427,13 +410,13 @@ unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, static void set_brk(unsigned long start, unsigned long end) { /* page-align the start and end addresses... */ - start = ALPHA_PAGE_ALIGN(start); - end = ALPHA_PAGE_ALIGN(end); + start = HOST_PAGE_ALIGN(start); + end = HOST_PAGE_ALIGN(end); if (end <= start) return; - if((long)mmap4k(start, end - start, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { + if(target_mmap(start, end - start, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { perror("cannot mmap brk"); exit(-1); } @@ -451,9 +434,9 @@ static void padzero(unsigned long elf_bss) unsigned long nbyte; char * fpnt; - nbyte = elf_bss & (ALPHA_PAGE_SIZE-1); /* was X86_PAGE_SIZE - JRP */ + nbyte = elf_bss & (host_page_size-1); /* was TARGET_PAGE_SIZE - JRP */ if (nbyte) { - nbyte = ALPHA_PAGE_SIZE - nbyte; + nbyte = host_page_size - nbyte; fpnt = (char *) elf_bss; do { *fpnt++ = 0; @@ -494,7 +477,7 @@ static unsigned int * create_elf_tables(char *p, int argc, int envc, NEW_AUX_ENT (AT_PHDR, (target_ulong)(load_addr + exec->e_phoff)); NEW_AUX_ENT (AT_PHENT, (target_ulong)(sizeof (struct elf_phdr))); NEW_AUX_ENT (AT_PHNUM, (target_ulong)(exec->e_phnum)); - NEW_AUX_ENT (AT_PAGESZ, (target_ulong)(ALPHA_PAGE_SIZE)); + NEW_AUX_ENT (AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE)); NEW_AUX_ENT (AT_BASE, (target_ulong)(interp_load_addr)); NEW_AUX_ENT (AT_FLAGS, (target_ulong)0); NEW_AUX_ENT (AT_ENTRY, load_bias + exec->e_entry); @@ -554,7 +537,7 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, /* Now read in all of the header information */ - if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > X86_PAGE_SIZE) + if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) return ~0UL; elf_phdata = (struct elf_phdr *) @@ -594,9 +577,9 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, if (interp_elf_ex->e_type == ET_DYN) { /* in order to avoid harcoding the interpreter load address in qemu, we allocate a big enough memory zone */ - error = (unsigned long)mmap4k(NULL, INTERP_MAP_SIZE, - PROT_NONE, MAP_PRIVATE | MAP_ANON, - -1, 0); + error = target_mmap(0, INTERP_MAP_SIZE, + PROT_NONE, MAP_PRIVATE | MAP_ANON, + -1, 0); if (error == -1) { perror("mmap"); exit(-1); @@ -620,12 +603,12 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, elf_type |= MAP_FIXED; vaddr = eppnt->p_vaddr; } - error = (unsigned long)mmap4k(load_addr+X86_ELF_PAGESTART(vaddr), - eppnt->p_filesz + X86_ELF_PAGEOFFSET(eppnt->p_vaddr), + error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), + eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), elf_prot, elf_type, interpreter_fd, - eppnt->p_offset - X86_ELF_PAGEOFFSET(eppnt->p_vaddr)); + eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); if (error > -1024UL) { /* Real error */ @@ -665,13 +648,13 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, * bss page. */ padzero(elf_bss); - elf_bss = X86_ELF_PAGESTART(elf_bss + ALPHA_PAGE_SIZE - 1); /* What we have mapped so far */ + elf_bss = TARGET_ELF_PAGESTART(elf_bss + host_page_size - 1); /* What we have mapped so far */ /* Map the last of the bss segment */ if (last_bss > elf_bss) { - mmap4k(elf_bss, last_bss-elf_bss, - PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); + target_mmap(elf_bss, last_bss-elf_bss, + PROT_READ|PROT_WRITE|PROT_EXEC, + MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); } free(elf_phdata); @@ -742,7 +725,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r unsigned int interpreter_type = INTERPRETER_NONE; unsigned char ibcs2_interpreter; int i; - void * mapped_addr; + unsigned long mapped_addr; struct elf_phdr * elf_ppnt; struct elf_phdr *elf_phdata; unsigned long elf_bss, k, elf_brk; @@ -979,33 +962,32 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r is because the brk will follow the loader, and is not movable. */ /* NOTE: for qemu, we do a big mmap to get enough space without harcoding any address */ - error = (unsigned long)mmap4k(NULL, ET_DYN_MAP_SIZE, - PROT_NONE, MAP_PRIVATE | MAP_ANON, - -1, 0); + error = target_mmap(0, ET_DYN_MAP_SIZE, + PROT_NONE, MAP_PRIVATE | MAP_ANON, + -1, 0); if (error == -1) { perror("mmap"); exit(-1); } - load_bias = X86_ELF_PAGESTART(error - elf_ppnt->p_vaddr); + load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); } - error = (unsigned long)mmap4k( - X86_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), - (elf_ppnt->p_filesz + - X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), - elf_prot, - (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), - bprm->fd, - (elf_ppnt->p_offset - - X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); + error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), + (elf_ppnt->p_filesz + + TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), + elf_prot, + (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), + bprm->fd, + (elf_ppnt->p_offset - + TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); if (error == -1) { perror("mmap"); exit(-1); } #ifdef LOW_ELF_STACK - if (X86_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) - elf_stack = X86_ELF_PAGESTART(elf_ppnt->p_vaddr); + if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) + elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); #endif if (!load_addr_set) { @@ -1013,7 +995,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; if (elf_ex.e_type == ET_DYN) { load_bias += error - - X86_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); + TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); load_addr += load_bias; } } @@ -1108,8 +1090,8 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r and some applications "depend" upon this behavior. Since we do not have the power to recompile these, we emulate the SVr4 behavior. Sigh. */ - mapped_addr = mmap4k(NULL, ALPHA_PAGE_SIZE, PROT_READ | PROT_EXEC, - MAP_FIXED | MAP_PRIVATE, -1, 0); + mapped_addr = target_mmap(0, host_page_size, PROT_READ | PROT_EXEC, + MAP_FIXED | MAP_PRIVATE, -1, 0); } #ifdef ELF_PLAT_INIT @@ -1137,7 +1119,7 @@ int elf_exec(const char * filename, char ** argv, char ** envp, int retval; int i; - bprm.p = X86_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); + bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ bprm.page[i] = 0; retval = open(filename, O_RDONLY); diff --git a/linux-user/main.c b/linux-user/main.c index 00dc271778..a6a84e5363 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -231,13 +231,16 @@ void usage(void) "usage: qemu [-h] [-d] [-L path] [-s size] program [arguments...]\n" "Linux x86 emulator\n" "\n" - "-h print this help\n" - "-d activate log (logfile=%s)\n" - "-L path set the x86 elf interpreter prefix (default=%s)\n" - "-s size set the x86 stack size in bytes (default=%ld)\n", - DEBUG_LOGFILE, + "-h print this help\n" + "-L path set the x86 elf interpreter prefix (default=%s)\n" + "-s size set the x86 stack size in bytes (default=%ld)\n" + "\n" + "debug options:\n" + "-d activate log (logfile=%s)\n" + "-p pagesize set the host page size to 'pagesize'\n", interp_prefix, - x86_stack_size); + x86_stack_size, + DEBUG_LOGFILE); _exit(1); } @@ -284,6 +287,13 @@ int main(int argc, char **argv) x86_stack_size *= 1024; } else if (!strcmp(r, "L")) { interp_prefix = argv[optind++]; + } else if (!strcmp(r, "p")) { + host_page_size = atoi(argv[optind++]); + if (host_page_size == 0 || + (host_page_size & (host_page_size - 1)) != 0) { + fprintf(stderr, "page size must be a power of two\n"); + exit(1); + } } else { usage(); } @@ -311,12 +321,18 @@ int main(int argc, char **argv) /* Scan interp_prefix dir for replacement files. */ init_paths(interp_prefix); + /* NOTE: we need to init the CPU at this stage to get the + host_page_size */ + env = cpu_x86_init(); + if (elf_exec(filename, argv+optind, environ, regs, info) != 0) { printf("Error loading %s\n", filename); _exit(1); } if (loglevel) { + page_dump(logfile); + fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk); fprintf(logfile, "end_code 0x%08lx\n" , info->end_code); fprintf(logfile, "start_code 0x%08lx\n" , info->start_code); @@ -331,7 +347,6 @@ int main(int argc, char **argv) syscall_init(); signal_init(); - env = cpu_x86_init(); global_env = env; /* build Task State */ diff --git a/linux-user/mmap.c b/linux-user/mmap.c new file mode 100644 index 0000000000..4c4d9100d8 --- /dev/null +++ b/linux-user/mmap.c @@ -0,0 +1,370 @@ +/* + * mmap support for qemu + * + * Copyright (c) 2003 Fabrice Bellard + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <stdlib.h> +#include <stdio.h> +#include <stdarg.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <sys/mman.h> + +#include "qemu.h" + +//#define DEBUG_MMAP + +/* NOTE: all the constants are the HOST ones */ +int target_mprotect(unsigned long start, unsigned long len, int prot) +{ + unsigned long end, host_start, host_end, addr; + int prot1, ret; + +#ifdef DEBUG_MMAP + printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len, + prot & PROT_READ ? 'r' : '-', + prot & PROT_WRITE ? 'w' : '-', + prot & PROT_EXEC ? 'x' : '-'); +#endif + + if ((start & ~TARGET_PAGE_MASK) != 0) + return -EINVAL; + len = TARGET_PAGE_ALIGN(len); + end = start + len; + if (end < start) + return -EINVAL; + if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) + return -EINVAL; + if (len == 0) + return 0; + + host_start = start & host_page_mask; + host_end = HOST_PAGE_ALIGN(end); + if (start > host_start) { + /* handle host page containing start */ + prot1 = prot; + for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) { + prot1 |= page_get_flags(addr); + } + ret = mprotect((void *)host_start, host_page_size, prot1 & PAGE_BITS); + if (ret != 0) + return ret; + host_start += host_page_size; + } + if (end < host_end) { + /* handle host page containing end (can be the same as first page) */ + prot1 = prot; + for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { + prot1 |= page_get_flags(addr); + } + ret = mprotect((void *)(host_end - host_page_size), host_page_size, + prot1 & PAGE_BITS); + if (ret != 0) + return ret; + host_end -= host_page_size; + } + + /* handle the pages in the middle */ + if (host_start < host_end) { + ret = mprotect((void *)host_start, host_end - host_start, prot); + if (ret != 0) + return ret; + } + + page_set_flags(start, start + len, prot | PAGE_VALID); + return 0; +} + +/* map an incomplete host page */ +int mmap_frag(unsigned long host_start, + unsigned long start, unsigned long end, + int prot, int flags, int fd, unsigned long offset) +{ + unsigned long host_end, ret, addr; + int prot1, prot_new; + + host_end = host_start + host_page_size; + + /* get the protection of the target pages outside the mapping */ + prot1 = 0; + for(addr = host_start; addr < host_end; addr++) { + if (addr < start || addr >= end) + prot1 |= page_get_flags(addr); + } + + if (prot1 == 0) { + /* no page was there, so we allocate one */ + ret = (long)mmap((void *)host_start, host_page_size, prot, + flags | MAP_ANONYMOUS, -1, 0); + if (ret == -1) + return ret; + } + prot1 &= PAGE_BITS; + + prot_new = prot | prot1; + if (!(flags & MAP_ANONYMOUS)) { + /* msync() won't work here, so we return an error if write is + possible while it is a shared mapping */ + if ((flags & MAP_TYPE) == MAP_SHARED && + (prot & PROT_WRITE)) + return -EINVAL; + + /* adjust protection to be able to read */ + if (!(prot1 & PROT_WRITE)) + mprotect((void *)host_start, host_page_size, prot1 | PROT_WRITE); + + /* read the corresponding file data */ + pread(fd, (void *)start, end - start, offset); + + /* put final protection */ + if (prot_new != (prot1 | PROT_WRITE)) + mprotect((void *)host_start, host_page_size, prot_new); + } else { + /* just update the protection */ + if (prot_new != prot1) { + mprotect((void *)host_start, host_page_size, prot_new); + } + } + return 0; +} + +/* NOTE: all the constants are the HOST ones */ +long target_mmap(unsigned long start, unsigned long len, int prot, + int flags, int fd, unsigned long offset) +{ + unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len; + +#ifdef DEBUG_MMAP + { + printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=", + start, len, + prot & PROT_READ ? 'r' : '-', + prot & PROT_WRITE ? 'w' : '-', + prot & PROT_EXEC ? 'x' : '-'); + if (flags & MAP_FIXED) + printf("MAP_FIXED "); + if (flags & MAP_ANONYMOUS) + printf("MAP_ANON "); + switch(flags & MAP_TYPE) { + case MAP_PRIVATE: + printf("MAP_PRIVATE "); + break; + case MAP_SHARED: + printf("MAP_SHARED "); + break; + default: + printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE); + break; + } + printf("fd=%d offset=%lx\n", fd, offset); + } +#endif + + if (offset & ~TARGET_PAGE_MASK) + return -EINVAL; + + len = TARGET_PAGE_ALIGN(len); + if (len == 0) + return start; + host_start = start & host_page_mask; + + if (!(flags & MAP_FIXED)) { + if (host_page_size != real_host_page_size) { + /* NOTE: this code is only for debugging with '-p' option */ + /* reserve a memory area */ + host_len = HOST_PAGE_ALIGN(len) + host_page_size - TARGET_PAGE_SIZE; + host_start = (long)mmap((void *)host_start, host_len, PROT_NONE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (host_start == -1) + return host_start; + host_end = host_start + host_len; + start = HOST_PAGE_ALIGN(host_start); + end = start + HOST_PAGE_ALIGN(len); + if (start > host_start) + munmap((void *)host_start, start - host_start); + if (end < host_end) + munmap((void *)end, host_end - end); + /* use it as a fixed mapping */ + flags |= MAP_FIXED; + } else { + /* if not fixed, no need to do anything */ + host_offset = offset & host_page_mask; + host_len = len + offset - host_offset; + start = (long)mmap((void *)host_start, host_len, + prot, flags, fd, host_offset); + if (start == -1) + return start; + /* update start so that it points to the file position at 'offset' */ + if (!(flags & MAP_ANONYMOUS)) + start += offset - host_offset; + goto the_end1; + } + } + + if (start & ~TARGET_PAGE_MASK) + return -EINVAL; + end = start + len; + host_end = HOST_PAGE_ALIGN(end); + + /* worst case: we cannot map the file because the offset is not + aligned, so we read it */ + if (!(flags & MAP_ANONYMOUS) && + (offset & ~host_page_mask) != (start & ~host_page_mask)) { + /* msync() won't work here, so we return an error if write is + possible while it is a shared mapping */ + if ((flags & MAP_TYPE) == MAP_SHARED && + (prot & PROT_WRITE)) + return -EINVAL; + retaddr = target_mmap(start, len, prot | PROT_WRITE, + MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, + -1, 0); + if (retaddr == -1) + return retaddr; + pread(fd, (void *)start, len, offset); + if (!(prot & PROT_WRITE)) { + ret = target_mprotect(start, len, prot); + if (ret != 0) + return ret; + } + goto the_end; + } + + /* handle the start of the mapping */ + if (start > host_start) { + if (host_end == host_start + host_page_size) { + /* one single host page */ + ret = mmap_frag(host_start, start, end, + prot, flags, fd, offset); + if (ret == -1) + return ret; + goto the_end1; + } + ret = mmap_frag(host_start, start, host_start + host_page_size, + prot, flags, fd, offset); + if (ret == -1) + return ret; + host_start += host_page_size; + } + /* handle the end of the mapping */ + if (end < host_end) { + ret = mmap_frag(host_end - host_page_size, + host_end - host_page_size, host_end, + prot, flags, fd, + offset + host_end - host_page_size - start); + if (ret == -1) + return ret; + host_end -= host_page_size; + } + + /* map the middle (easier) */ + if (host_start < host_end) { + ret = (long)mmap((void *)host_start, host_end - host_start, + prot, flags, fd, offset + host_start - start); + if (ret == -1) + return ret; + } + the_end1: + page_set_flags(start, start + len, prot | PAGE_VALID); + the_end: +#ifdef DEBUG_MMAP + page_dump(stdout); + printf("\n"); +#endif + return start; +} + +int target_munmap(unsigned long start, unsigned long len) +{ + unsigned long end, host_start, host_end, addr; + int prot, ret; + +#ifdef DEBUG_MMAP + printf("munmap: start=0x%lx len=0x%lx\n", start, len); +#endif + if (start & ~TARGET_PAGE_MASK) + return -EINVAL; + len = TARGET_PAGE_ALIGN(len); + if (len == 0) + return -EINVAL; + end = start + len; + host_start = start & host_page_mask; + host_end = HOST_PAGE_ALIGN(end); + + if (start > host_start) { + /* handle host page containing start */ + prot = 0; + for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) { + prot |= page_get_flags(addr); + } + if (prot != 0) + host_start += host_page_size; + } + if (end < host_end) { + /* handle host page containing end (can be the same as first page) */ + prot = 0; + for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { + prot |= page_get_flags(addr); + } + if (prot != 0) + host_end -= host_page_size; + } + + /* unmap what we can */ + if (host_start < host_end) { + ret = munmap((void *)host_start, host_end - host_start); + if (ret != 0) + return ret; + } + + page_set_flags(start, start + len, 0); + return 0; +} + +/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED + blocks which have been allocated starting on a host page */ +long target_mremap(unsigned long old_addr, unsigned long old_size, + unsigned long new_size, unsigned long flags, + unsigned long new_addr) +{ + int prot; + + /* XXX: use 5 args syscall */ + new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags); + if (new_addr == -1) + return new_addr; + prot = page_get_flags(old_addr); + page_set_flags(old_addr, old_addr + old_size, 0); + page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); + return new_addr; +} + +int target_msync(unsigned long start, unsigned long len, int flags) +{ + unsigned long end; + + if (start & ~TARGET_PAGE_MASK) + return -EINVAL; + len = TARGET_PAGE_ALIGN(len); + if (len == 0) + return 0; + end = start + len; + + start &= host_page_mask; + return msync((void *)start, len, flags); +} + diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 0f004ffa5e..7e23f2791e 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -88,4 +88,14 @@ void handle_vm86_fault(CPUX86State *env); int do_vm86(CPUX86State *env, long subfunction, struct target_vm86plus_struct * target_v86); +/* mmap.c */ +int target_mprotect(unsigned long start, unsigned long len, int prot); +long target_mmap(unsigned long start, unsigned long len, int prot, + int flags, int fd, unsigned long offset); +int target_munmap(unsigned long start, unsigned long len); +long target_mremap(unsigned long old_addr, unsigned long old_size, + unsigned long new_size, unsigned long flags, + unsigned long new_addr); +int target_msync(unsigned long start, unsigned long len, int flags); + #endif diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 38e242b487..ac7a11192b 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -64,11 +64,6 @@ //#define DEBUG -#ifndef PAGE_SIZE -#define PAGE_SIZE 4096 -#define PAGE_MASK ~(PAGE_SIZE - 1) -#endif - //#include <linux/msdos_fs.h> #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2]) @@ -153,7 +148,7 @@ static long do_brk(char *new_brk) if (new_brk < target_original_brk) return -ENOMEM; - brk_page = (char *)(((unsigned long)target_brk + PAGE_SIZE - 1) & PAGE_MASK); + brk_page = (char *)HOST_PAGE_ALIGN((unsigned long)target_brk); /* If the new brk is less than this, set it and we're done... */ if (new_brk < brk_page) { @@ -162,11 +157,10 @@ static long do_brk(char *new_brk) } /* We need to allocate more memory after the brk... */ - new_alloc_size = ((new_brk - brk_page + 1)+(PAGE_SIZE-1)) & PAGE_MASK; - mapped_addr = get_errno((long)mmap((caddr_t)brk_page, new_alloc_size, - PROT_READ|PROT_WRITE, - MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0)); - + new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1); + mapped_addr = get_errno(target_mmap((unsigned long)brk_page, new_alloc_size, + PROT_READ|PROT_WRITE, + MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0)); if (is_error(mapped_addr)) { return mapped_addr; } else { @@ -1709,7 +1703,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, v4 = tswap32(vptr[3]); v5 = tswap32(vptr[4]); v6 = tswap32(vptr[5]); - ret = get_errno((long)mmap((void *)v1, v2, v3, v4, v5, v6)); + ret = get_errno(target_mmap(v1, v2, v3, v4, v5, v6)); } break; #endif @@ -1718,16 +1712,16 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, #else case TARGET_NR_mmap: #endif - ret = get_errno((long)mmap((void *)arg1, arg2, arg3, arg4, arg5, arg6)); + ret = get_errno(target_mmap(arg1, arg2, arg3, arg4, arg5, arg6)); break; case TARGET_NR_munmap: - ret = get_errno(munmap((void *)arg1, arg2)); + ret = get_errno(target_munmap(arg1, arg2)); break; case TARGET_NR_mprotect: - ret = get_errno(mprotect((void *)arg1, arg2, arg3)); + ret = get_errno(target_mprotect(arg1, arg2, arg3)); break; case TARGET_NR_mremap: - ret = get_errno((long)mremap((void *)arg1, arg2, arg3, arg4)); + ret = get_errno(target_mremap(arg1, arg2, arg3, arg4, arg5)); break; case TARGET_NR_msync: ret = get_errno(msync((void *)arg1, arg2, arg3)); |