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- /* When we enter this piece of code, the program stack looks like this:
- argc argument counter (integer)
- argv[0] program name (pointer)
- argv[1...N] program args (pointers)
- argv[argc-1] end of args (integer)
- NULL
- env[0...N] environment variables (pointers)
- NULL
- */
- #include <features.h>
- #include <sys/regdef.h>
- .text
- .global __start
- .type __start,%function
- .type __uClibc_start_main,%function
- .weak _init
- .weak _fini
- .type __uClibc_start_main,%function
- /* Stick in a dummy reference to main(), so that if an application
- * is linking when the main() function is in a static library (.a)
- * we can be sure that main() actually gets linked in */
- .type main,%function
- __start:
- #ifdef __PIC__
- .set noreorder
- bltzal zero,0f
- nop
- 0: .cpload $31
- .set reorder
- #endif
- move $31, zero /* no return, but since the jal kills $31, skip this */
- lw a0, 0($29) /* argc */
- addu a1, $29, 4 /* get to start of argv */
- addu a2, a0, 1 /* argv[0] program name (ordinal->cardinal) */
- sll a2, a2, 2 /* multiple by 4 */
- add a2, a2, a1 /* a2 now points to start of envp */
- la a3, _init /* a3 is address of _init */
- addiu sp, sp, -24 /* 16 + 4 rounded up to multiple of 8 */
- /* multiple of 8 for longlong/double support */
- la v0, _fini
- sw v0, 16(sp) /* stack has 5th argument, address of _fini */
- /* Ok, now run uClibc's main() -- shouldn't return */
- jal __uClibc_start_main
- addiu sp, sp, 24 /* undo stack argument */
- /* Crash if somehow `exit' returns anyways. */
- hlt:
- b hlt
- /* 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
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