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- /* Startup code for ARM & ELF
- Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- MA 02110-1301, USA. */
- /* This is the canonical entry point, usually the first thing in the text
- segment.
- Note that the code in the .init section has already been run.
- This includes _init and _libc_init
- At this entry point, most registers' values are unspecified, except:
- a0 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.
- sp The stack contains the arguments and environment:
- 0(sp) argc
- 8(sp) argv[0]
- ...
- (8*argc)(sp) NULL
- (8*(argc+1))(sp) envp[0]
- ...
- NULL
- */
- .text
- .globl _start
- .type _start,function
- _start:
- .option push
- .option norelax
- 1:auipc gp, %pcrel_hi(__global_pointer$)
- addi gp, gp, %pcrel_lo(1b)
- .option pop
- /* Store rtld_fini in a5 */
- addi a5, a0, 0
- /* Clear the frame pointer since this is the outermost frame. */
- addi x8, x0, 0
- /* Pop argc off the stack, and save argc, argv and envp */
- ld a1, 0(sp)
- addi a2, sp, 8
- addi a4, a1, 1
- slli a4, a4, 3
- add a4, a2, a4
- 1:auipc x8,%pcrel_hi(operatingsystem_parameter_argc)
- sw a1,%pcrel_lo(1b)(x8)
- 1:auipc x8,%pcrel_hi(operatingsystem_parameter_argv)
- sd a2,%pcrel_lo(1b)(x8)
- 1:auipc x8,%pcrel_hi(operatingsystem_parameter_envp)
- sd a4,%pcrel_lo(1b)(x8)
- /* Save initial stackpointer */
- 1:auipc x8,%pcrel_hi(__stkptr)
- sd sp,%pcrel_lo(1b)(x8)
- /* Fetch address of fini */
- 1:auipc x8,%pcrel_hi(__libc_csu_fini)
- addi a4,x8,%pcrel_lo(1b)
- addi a6, sp, 0
- /* Set up the other arguments in registers */
- 1:auipc x8,%pcrel_hi(PASCALMAIN)
- addi a0, x8, %pcrel_lo(1b)
- 1:auipc x8,%pcrel_hi(__libc_csu_init)
- addi a3, x8, %pcrel_lo(1b)
- /* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
- /* Let the libc call main and exit with its return code. */
- 1:auipc x8,%pcrel_hi(__libc_start_main)
- jalr ra, x8, %pcrel_lo(1b)
- /* should never get here....*/
- 1:auipc x8,%pcrel_hi(abort)
- jalr ra, x8, %pcrel_lo(1b)
- .globl _haltproc
- .type _haltproc,function
- _haltproc:
- 1:auipc x8,%pcrel_hi(operatingsystem_result)
- lbu x1,%pcrel_lo(1b)(x8)
- addi x17, x0, 94
- ecall
- jal x0, _haltproc
- /* 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
- .bss
- .comm __stkptr,8
- .comm operatingsystem_parameter_envp,8
- .comm operatingsystem_parameter_argc,4
- .comm operatingsystem_parameter_argv,8
- .section ".comment"
- .byte 0
- .ascii "generated by FPC http://www.freepascal.org\0"
- /* We need this stuff to make gdb behave itself, otherwise
- gdb will chokes with SIGILL when trying to debug apps.
- */
- .section ".note.ABI-tag", "a"
- .align 4
- .long 1f - 0f
- .long 3f - 2f
- .long 1
- 0: .asciz "GNU"
- 1: .align 4
- 2: .long 0
- .long 2,0,0
- 3: .align 4
- .section .note.GNU-stack,"",%progbits
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