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| author | Christophe Lyon <christophe.lyon@st.com> | 2013-01-21 09:37:43 +0100 |
|---|---|---|
| committer | Waldemar Brodkorb <wbrodkorb@conet.de> | 2018-08-10 16:02:23 +0200 |
| commit | c2586973f811dee017277d528c2ef007cea6d4ab (patch) | |
| tree | 3973dff25a536cd61df3fe656cdd755c94a38db2 /libc | |
| parent | c86f875f07f2e2ef54ce3741914a5cc74f7ddd3c (diff) | |
Add application startup code for FDPIC
* libc/sysdeps/linux/arm/crt1.S: Define _start for __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/arm/crt1.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/crt1.S b/libc/sysdeps/linux/arm/crt1.S index ab3b0d293..5da0fe19c 100644 --- a/libc/sysdeps/linux/arm/crt1.S +++ b/libc/sysdeps/linux/arm/crt1.S @@ -95,6 +95,69 @@ ARM register quick reference: #include <features.h> #include <bits/arm_asm.h> +#if defined(__FDPIC__) +.text + .arm + .globl _start + +_start: + /* Start by self relocation. */ + sub r4, pc, #8 + ldr r1, .L__ROFIXUP_LIST__ + add r1, r1, r4 + ldr r2, .L__ROFIXUP_END__ + add r2, r2, r4 + mov r0, r7 + push {r9, r10} + bl __self_reloc + pop {r9, r10} + mov r9, r0 + + /* Clear the frame pointer since this is the outermost frame. */ + mov r3, #0 + mov fp, r3 + + /* Now fill __uClibc_main arguments. */ + sub sp, sp, #16 /* Reserve space for 3 args (keep aligment) */ + ldr r0, .L_main_got_funcdesc /* r0 GOT FUNCDESC of main */ + ldr r0, [r9, r0] + ldr r1, [sp, #16] /* argc */ + add r2, sp, #20 /* argv */ + ldr r3, .L_init_got_funcdesc /* r3 GOT init */ + ldr r3, [r9, r3] + ldr r4, .L_fini_got_funcdesc + ldr r4, [r9, r4] + str r4, [sp, #0] /* sp + 0 GOT fini */ + movs r4, r8 /* Test if static binary (r8 is 0 as there is no interpreter). */ + movne r4, r10 + moveq r4, #0 + str r4, [sp, #4] /* sp + 4 got rtld_fini */ + mov r4, r2 /* stack_end is unused.... */ + str r4, [sp, #8] /* sp + 8 got stack_end */ + bl __uClibc_main + /* We should never get here.... */ + bl abort +.L__ROFIXUP_LIST__: + .word __ROFIXUP_LIST__ - _start +.L__ROFIXUP_END__: + .word __ROFIXUP_END__ - _start +.L_main_got_funcdesc: + .word main(GOTFUNCDESC) +.L_init_got_funcdesc: + .word _init(GOTFUNCDESC) +.L_fini_got_funcdesc: + .word _fini(GOTFUNCDESC) + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + .weak data_start + data_start = __data_start + +#else /* defined(__FDPIC__) */ + .text .globl _start .type _start,%function @@ -250,3 +313,4 @@ __data_start: .long 0 .weak data_start data_start = __data_start +#endif /* defined(__FDPIC__) */ |