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preloader: Setup a fake thread-local storage block pointed to by %gs.

This commit is contained in:
Alexandre Julliard 2006-11-03 13:55:41 +01:00
parent c9b5569bc2
commit a68d293bae
2 changed files with 35 additions and 1 deletions
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4
libs/wine/ldt.c
View File

@ -405,6 +405,10 @@ unsigned short wine_ldt_alloc_fs(void)
struct modify_ldt_s ldt_info;
int ret;
/* the preloader may have allocated it already */
global_fs_sel = wine_get_fs();
if (global_fs_sel && is_gdt_sel(global_fs_sel)) return global_fs_sel;
ldt_info.entry_number = -1;
fill_modify_ldt_struct( &ldt_info, &null_entry );
if ((ret = set_thread_area( &ldt_info ) < 0))

32
loader/preloader.c
View File

@ -163,6 +163,26 @@ void __bb_init_func(void) { return; }
void *__stack_chk_guard = 0;
void __stack_chk_fail(void) { return; }
/* data for setting up the glibc-style thread-local storage in %gs */
static int thread_data[256];
struct
{
/* this is the kernel modify_ldt struct */
unsigned int entry_number;
unsigned long base_addr;
unsigned int limit;
unsigned int seg_32bit : 1;
unsigned int contents : 2;
unsigned int read_exec_only : 1;
unsigned int limit_in_pages : 1;
unsigned int seg_not_present : 1;
unsigned int useable : 1;
unsigned int garbage : 25;
} thread_ldt = { -1, (unsigned long)thread_data, 0xfffff, 1, 0, 0, 1, 0, 1, 0 };
/*
* The _start function is the entry and exit point of this program
*
@ -172,7 +192,17 @@ void __stack_chk_fail(void) { return; }
void _start();
extern char _end[];
__ASM_GLOBAL_FUNC(_start,
"\tmovl %esp,%eax\n"
"\tmovl $243,%eax\n" /* SYS_set_thread_area */
"\tmovl $thread_ldt,%ebx\n"
"\tint $0x80\n" /* allocate gs segment */
"\torl %eax,%eax\n"
"\tjl 1f\n"
"\tmovl thread_ldt,%eax\n" /* thread_ldt.entry_number */
"\tshl $3,%eax\n"
"\torl $3,%eax\n"
"\tmov %ax,%gs\n"
"\tmov %ax,%fs\n" /* set %fs too so libwine can retrieve it later on */
"1:\tmovl %esp,%eax\n"
"\tleal -136(%esp),%esp\n" /* allocate some space for extra aux values */
"\tpushl %eax\n" /* orig stack pointer */
"\tpushl %esp\n" /* ptr to orig stack pointer */