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mmap emulation

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@158 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-05-13 00:25:15 +00:00
parent 74c95119f2
commit 54936004fd
9 changed files with 646 additions and 101 deletions
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4
Makefile
View File

@ -58,11 +58,11 @@ LDFLAGS+=-p
main.o: CFLAGS+=-p
endif
OBJS= elfload.o main.o syscall.o signal.o vm86.o path.o
OBJS= elfload.o main.o syscall.o mmap.o signal.o vm86.o path.o
SRCS:= $(OBJS:.o=.c)
OBJS+= libqemu.a
LIBOBJS+=thunk.o translate-i386.o op-i386.o exec-i386.o
LIBOBJS+=thunk.o translate-i386.o op-i386.o exec-i386.o exec.o
# NOTE: the disassembler code is only needed for debugging
LIBOBJS+=disas.o ppc-dis.o i386-dis.o alpha-dis.o dis-buf.o

25
cpu-i386.h
View File

@ -431,6 +431,30 @@ int cpu_x86_signal_handler(int host_signum, struct siginfo *info,
#define X86_DUMP_CCOP 0x0002 /* dump qemu flag cache */
void cpu_x86_dump_state(CPUX86State *env, FILE *f, int flags);
/* page related stuff */
#define TARGET_PAGE_BITS 12
#define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS)
#define TARGET_PAGE_MASK ~(TARGET_PAGE_SIZE - 1)
#define TARGET_PAGE_ALIGN(addr) (((addr) + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK)
extern unsigned long real_host_page_size;
extern unsigned long host_page_bits;
extern unsigned long host_page_size;
extern unsigned long host_page_mask;
#define HOST_PAGE_ALIGN(addr) (((addr) + host_page_size - 1) & host_page_mask)
/* same as PROT_xxx */
#define PAGE_READ 0x0001
#define PAGE_WRITE 0x0002
#define PAGE_EXEC 0x0004
#define PAGE_BITS (PAGE_READ | PAGE_WRITE | PAGE_EXEC)
#define PAGE_VALID 0x0008
void page_dump(FILE *f);
int page_get_flags(unsigned long address);
void page_set_flags(unsigned long start, unsigned long end, int flags);
/* internal functions */
#define GEN_FLAG_CODE32_SHIFT 0
@ -446,5 +470,6 @@ int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size,
int *gen_code_size_ptr,
uint8_t *pc_start, uint8_t *cs_base, int flags);
void cpu_x86_tblocks_init(void);
void page_init(void);
#endif /* CPU_I386_H */

148
exec.c Normal file
View File

@ -0,0 +1,148 @@
/*
* virtual page mapping
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include "cpu-i386.h"
/* XXX: pack the flags in the low bits of the pointer ? */
typedef struct PageDesc {
struct TranslationBlock *first_tb;
unsigned long flags;
} PageDesc;
#define L2_BITS 10
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
unsigned long real_host_page_size;
unsigned long host_page_bits;
unsigned long host_page_size;
unsigned long host_page_mask;
static PageDesc *l1_map[L1_SIZE];
void page_init(void)
{
/* NOTE: we can always suppose that host_page_size >=
TARGET_PAGE_SIZE */
real_host_page_size = getpagesize();
if (host_page_size == 0)
host_page_size = real_host_page_size;
if (host_page_size < TARGET_PAGE_SIZE)
host_page_size = TARGET_PAGE_SIZE;
host_page_bits = 0;
while ((1 << host_page_bits) < host_page_size)
host_page_bits++;
host_page_mask = ~(host_page_size - 1);
}
/* dump memory mappings */
void page_dump(FILE *f)
{
unsigned long start, end;
int i, j, prot, prot1;
PageDesc *p;
fprintf(f, "%-8s %-8s %-8s %s\n",
"start", "end", "size", "prot");
start = -1;
end = -1;
prot = 0;
for(i = 0; i <= L1_SIZE; i++) {
if (i < L1_SIZE)
p = l1_map[i];
else
p = NULL;
for(j = 0;j < L2_SIZE; j++) {
if (!p)
prot1 = 0;
else
prot1 = p[j].flags;
if (prot1 != prot) {
end = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS);
if (start != -1) {
fprintf(f, "%08lx-%08lx %08lx %c%c%c\n",
start, end, end - start,
prot & PAGE_READ ? 'r' : '-',
prot & PAGE_WRITE ? 'w' : '-',
prot & PAGE_EXEC ? 'x' : '-');
}
if (prot1 != 0)
start = end;
else
start = -1;
prot = prot1;
}
if (!p)
break;
}
}
}
static inline PageDesc *page_find_alloc(unsigned long address)
{
unsigned int index;
PageDesc **lp, *p;
index = address >> TARGET_PAGE_BITS;
lp = &l1_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = malloc(sizeof(PageDesc) * L2_SIZE);
memset(p, 0, sizeof(sizeof(PageDesc) * L2_SIZE));
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
int page_get_flags(unsigned long address)
{
unsigned int index;
PageDesc *p;
index = address >> TARGET_PAGE_BITS;
p = l1_map[index >> L2_BITS];
if (!p)
return 0;
return p[index & (L2_SIZE - 1)].flags;
}
void page_set_flags(unsigned long start, unsigned long end, int flags)
{
PageDesc *p;
unsigned long addr;
start = start & TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
p = page_find_alloc(addr);
p->flags = flags;
}
}

134
linux-user/elfload.c
View File

@ -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);

29
linux-user/main.c
View File

@ -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 */

370
linux-user/mmap.c Normal file
View File

@ -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);
}

10
linux-user/qemu.h
View File

@ -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

26
linux-user/syscall.c
View File

@ -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));

1
translate-i386.c
View File

@ -3845,6 +3845,7 @@ CPUX86State *cpu_x86_init(void)
if (!inited) {
inited = 1;
optimize_flags_init();
page_init();
}
return env;
}