diff options
Diffstat (limited to 'libc/sysdeps/linux')
| -rw-r--r-- | libc/sysdeps/linux/arm/crt0.S | 28 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/crt0.S | 27 | ||||
| -rw-r--r-- | libc/sysdeps/linux/mips/crt0.S | 17 | ||||
| -rw-r--r-- | libc/sysdeps/linux/sh/crt0.S | 49 |
4 files changed, 72 insertions, 49 deletions
diff --git a/libc/sysdeps/linux/arm/crt0.S b/libc/sysdeps/linux/arm/crt0.S index 442c9e84b..dc0ec87d8 100644 --- a/libc/sysdeps/linux/arm/crt0.S +++ b/libc/sysdeps/linux/arm/crt0.S @@ -50,20 +50,10 @@ ARM register quick reference: .text .global _start - .global __uClibc_main - .type _start,%function - .type __uClibc_main,%function .text _start: -#if 0 /* some old code the I feel should not be here - davidm */ - @ adjust the data segment base pointer - ldr r3,=__data_start - sub sl,sl,r3 - mov BASEREG,sl -#endif - /* clear the frame pointer */ mov fp, #0 @@ -78,10 +68,11 @@ _start: we find there (hopefully the environment) in r2 */ add r2, r1, r0, lsl #2 add r2, r2, #4 + #else /* - * uClinux stacks look a little different to MMU stacks - * for no good reason + * uClinux stacks look a little different from normal + * MMU-full Linux stacks (for no good reason) */ /* pull argc, argv and envp off the stack */ ldr r0,[sp, #0] @@ -89,8 +80,19 @@ _start: ldr r2,[sp, #8] #endif + /* Store the address of _init in r3 as an argument to main() */ + ldr r3, =_init + + /* Push _fini onto the stack as the final argument to main() */ + stmfd sp!, {r0} + ldr a1, =_fini + stmfd sp!, {r0} + /* Ok, now run uClibc's main() -- shouldn't return */ - bl __uClibc_main + bl __uClibc_start_main + + /* Crash if somehow `exit' returns anyways. */ + bl abort /* Stick in a dummy reference to main(), so that if an application * is linking when the main() function is in a static library (.a) diff --git a/libc/sysdeps/linux/i386/crt0.S b/libc/sysdeps/linux/i386/crt0.S index 3623fe821..97f1fde63 100644 --- a/libc/sysdeps/linux/i386/crt0.S +++ b/libc/sysdeps/linux/i386/crt0.S @@ -33,11 +33,11 @@ Cambridge, MA 02139, USA. */ .text .align 4 -.globl _start - .type _start,@function + .globl _start + .type _start,@function _start: - /* First locate the start of the environment variables */ + /* locate the start of the environment variables */ popl %ecx /* Store argc into %ecx */ movl %esp,%ebx /* Store argv into ebx */ movl %esp,%eax /* Store argv into eax as well*/ @@ -52,7 +52,6 @@ _start: %eax = env ; argv + (argc * 4) + 4 */ - /* Set up an invalid (NULL return address, NULL frame pointer) callers stack frame so anybody unrolling the stack knows where to stop */ @@ -62,20 +61,18 @@ _start: pushl %ebp /* callers %ebp (frame pointer) */ movl %esp,%ebp /* mark callers stack frame as invalid */ - /* Now set the environment, argc, and argv where the app can get to them */ - pushl %eax /* Environment pointer */ - pushl %ebx /* Argument pointer */ - pushl %ecx /* And the argument count */ + /* Push .init and .fini arguments to __uClibc_start_main() on the stack */ + pushl $_fini + pushl $_init -#if 0 - /* Make sure we are not using iBCS2 personality. (i.e. force linux). */ - movl $136,%eax - sub %ebx,%ebx - int $0x80 -#endif + /* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */ + pushl %eax /* Environment pointer */ + pushl %ebx /* Argument pointer */ + pushl %ecx /* And the argument count */ /* Ok, now run uClibc's main() -- shouldn't return */ - call __uClibc_main + call __uClibc_start_main + /* Crash if somehow `exit' returns anyways. */ hlt diff --git a/libc/sysdeps/linux/mips/crt0.S b/libc/sysdeps/linux/mips/crt0.S index 6770ab0b1..7ff3b253f 100644 --- a/libc/sysdeps/linux/mips/crt0.S +++ b/libc/sysdeps/linux/mips/crt0.S @@ -30,9 +30,22 @@ __start: addu a2, a0, 1 /* load envp */ sll a2, a2, 2 add a2, a2, a1 + + /* Store the address of _init in a3 as an argument to __uClibc_start_main() */ + la a3, _init + + /* Push _fini onto the stack as the final argument to __uClibc_start_main() + I don't think I am doing this properly but it at least compiles... + */ + la t0, _fini + sw t0,16(sp) + /* Ok, now run uClibc's main() -- shouldn't return */ - jal __uClibc_main - hlt: b hlt /* Crash if somehow it does return. */ + jal __uClibc_start_main + + /* Crash if somehow `exit' returns anyways. */ +hlt: + b hlt /* Stick in a dummy reference to main(), so that if an application * is linking when the main() function is in a static library (.a) diff --git a/libc/sysdeps/linux/sh/crt0.S b/libc/sysdeps/linux/sh/crt0.S index 10915d545..e74ae86c4 100644 --- a/libc/sysdeps/linux/sh/crt0.S +++ b/libc/sysdeps/linux/sh/crt0.S @@ -26,13 +26,6 @@ At this entry point, most registers' values are unspecified, except: - r4 Contains a function pointer to be registered with `atexit'. - This is how the dynamic linker arranges to have DT_FINI - functions called for shared libraries that have been loaded - before this code runs. - WARNING: At that stage only static linker is supported. For - uCLinux we won't bother with r4. - sp The stack contains the arguments and environment: 0(sp) argc 4(sp) argv[0] @@ -42,18 +35,26 @@ ... NULL */ + .file "crt0.S" .text .globl _start .type _start,@function .size _start,_start_end - _start _start: - /* Clear the frame pointer since this is the outermost frame. (in delay slot) */ + /* Clear the frame pointer since this is the outermost frame. */ mov #0, r14 /* Pop argc off the stack and save a pointer to argv */ mov.l @r15+,r4 mov r15, r5 + /* Push the finip argument to __uClibc_start_main() onto the stack */ + mov.l L_fini,r6 + mov.l r6,@-r15 + + /* Setup the value for the initp argument */ + mov.l L_init, r7 + /* * Setup the value for the environment pointer: * r6 = (argc + 1) * 4 @@ -62,27 +63,39 @@ _start: mov r4,r6 add #1,r6 shll2 r6 - add r5,r6 - /* call main */ + /* jump to __uClibc_start_main (argc, argv, envp, app_init, app_fini) */ mov.l L_main, r0 jsr @r0 - nop /* delay slot */ - + add r5, r6 /* delay slot */ /* We should not get here. */ mov.l L_abort, r0 - jsr @r0 - nop /* delay slot */ + jmp @r0 + nop _start_end: .align 2 + .weak _init + .type _init,@function +_init: + rts + nop + +.Lfe1: + .size _init,.Lfe1-_init + .weak _fini + .set _fini,_init L_main: - .long __uClibc_main + .long __uClibc_start_main /* in libuClibc.*.so */ -L_abort: - .long abort +L_init: + .long _init +L_fini: + .long _fini +L_abort: + .long abort /* Stick in a dummy reference to main(), so that if an application * is linking when the main() function is in a static library (.a) @@ -90,5 +103,3 @@ L_abort: L_dummy_main_reference: .long main - .data - |