diff options
Diffstat (limited to 'sysdeps/aarch64/dl-machine.h')
| -rw-r--r-- | sysdeps/aarch64/dl-machine.h | 77 |
1 files changed, 2 insertions, 75 deletions
diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h index b40050a..fe120bb 100644 --- a/sysdeps/aarch64/dl-machine.h +++ b/sysdeps/aarch64/dl-machine.h @@ -105,81 +105,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], return lazy; } -/* Initial entry point for the dynamic linker. The C function - _dl_start is the real entry point, its return value is the user - program's entry point */ -#ifdef __LP64__ -# define RTLD_START RTLD_START_1 ("x", "3", "sp") -#else -# define RTLD_START RTLD_START_1 ("w", "2", "wsp") -#endif - - -#define RTLD_START_1(PTR, PTR_SIZE_LOG, PTR_SP) asm ("\ -.text \n\ -.globl _start \n\ -.type _start, %function \n\ -.globl _dl_start_user \n\ -.type _dl_start_user, %function \n\ -_start: \n\ - // bti c \n\ - hint 34 \n\ - mov " PTR "0, " PTR_SP " \n\ - bl _dl_start \n\ - // returns user entry point in x0 \n\ - mov x21, x0 \n\ -_dl_start_user: \n\ - // get the original arg count \n\ - ldr " PTR "1, [sp] \n\ - // get the argv address \n\ - add " PTR "2, " PTR_SP ", #(1<<" PTR_SIZE_LOG ") \n\ - // get _dl_skip_args to see if we were \n\ - // invoked as an executable \n\ - adrp x4, _dl_skip_args \n\ - ldr w4, [x4, #:lo12:_dl_skip_args] \n\ - // do we need to adjust argc/argv \n\ - cmp w4, 0 \n\ - beq .L_done_stack_adjust \n\ - // subtract _dl_skip_args from original arg count \n\ - sub " PTR "1, " PTR "1, " PTR "4 \n\ - // store adjusted argc back to stack \n\ - str " PTR "1, [sp] \n\ - // find the first unskipped argument \n\ - mov " PTR "3, " PTR "2 \n\ - add " PTR "4, " PTR "2, " PTR "4, lsl #" PTR_SIZE_LOG " \n\ - // shuffle argv down \n\ -1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\ - str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "5, #0 \n\ - bne 1b \n\ - // shuffle envp down \n\ -1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\ - str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "5, #0 \n\ - bne 1b \n\ - // shuffle auxv down \n\ -1: ldp " PTR "0, " PTR "5, [x4, #(2<<" PTR_SIZE_LOG ")]! \n\ - stp " PTR "0, " PTR "5, [x3], #(2<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "0, #0 \n\ - bne 1b \n\ - // Update _dl_argv \n\ - adrp x3, __GI__dl_argv \n\ - str " PTR "2, [x3, #:lo12:__GI__dl_argv] \n\ -.L_done_stack_adjust: \n\ - // compute envp \n\ - add " PTR "3, " PTR "2, " PTR "1, lsl #" PTR_SIZE_LOG " \n\ - add " PTR "3, " PTR "3, #(1<<" PTR_SIZE_LOG ") \n\ - adrp x16, _rtld_local \n\ - add " PTR "16, " PTR "16, #:lo12:_rtld_local \n\ - ldr " PTR "0, [x16] \n\ - bl _dl_init \n\ - // load the finalizer function \n\ - adrp x0, _dl_fini \n\ - add " PTR "0, " PTR "0, #:lo12:_dl_fini \n\ - // jump to the user_s entry point \n\ - mov x16, x21 \n\ - br x16 \n\ -"); +/* In elf/rtld.c _dl_start should be global so dl-start.S can reference it. */ +#define RTLD_START asm (".globl _dl_start"); #define elf_machine_type_class(type) \ ((((type) == AARCH64_R(JUMP_SLOT) \ |