Firmwares/bare-metal-bsp/env/start.S

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// See LICENSE for license details.
.section .init
.globl _start
.type _start,@function
_start:
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.option push
.option norelax
la gp, __global_pointer$
.option pop
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la sp, _sp
/* Load data section */
la a0, _data_lma
la a1, _data
la a2, _edata
bgeu a1, a2, 2f
1:
lw t0, (a0)
sw t0, (a1)
addi a0, a0, 4
addi a1, a1, 4
bltu a1, a2, 1b
2:
/* Clear bss section */
la a0, __bss_start
la a1, _end
bgeu a0, a1, 2f
1:
sw zero, (a0)
addi a0, a0, 4
bltu a0, a1, 1b
2:
/* Call global constructors */
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#ifdef HAVE_INIT_FINI
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la a0, __libc_fini_array
call atexit
call __libc_init_array
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#endif
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#ifndef __riscv_float_abi_soft
/* Enable FPU */
li t0, MSTATUS_FS
csrs mstatus, t0
csrr t1, mstatus
and t1, t1, t0
beqz t1, 1f
fssr x0
1:
#endif
/* argc = argv = 0 */
li a0, 0
li a1, 0
call main
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tail _exit