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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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134
linux-user/elfload.c
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@ -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);