/*
Entry point of all programs (_start).
It initializes DWARF call frame information, the stack pointer, the
frame pointer (needed for closures to work in start_rust) and the global
pointer. Then it calls _start_rust.
*/
.section .init, "ax"
.global _start
_start:
.cfi_startproc
.cfi_undefined ra
.option push
.option norelax
la gp, __global_pointer$
.option pop
la sp, _stack_start
add s0, sp, zero
jal zero, _start_rust
.cfi_endproc
/*
Trap entry point (_start_trap)
Saves caller saved registers ra, t0..6, a0..7, calls _start_trap_rust,
restores caller saved registers and then returns.
*/
.section .trap, "ax"
.global _start_trap
_start_trap:
addi sp, sp, -16*4
sw ra, 0*4(sp)
sw t0, 1*4(sp)
sw t1, 2*4(sp)
sw t2, 3*4(sp)
sw t3, 4*4(sp)
sw t4, 5*4(sp)
sw t5, 6*4(sp)
sw t6, 7*4(sp)
sw a0, 8*4(sp)
sw a1, 9*4(sp)
sw a2, 10*4(sp)
sw a3, 11*4(sp)
sw a4, 12*4(sp)
sw a5, 13*4(sp)
sw a6, 14*4(sp)
sw a7, 15*4(sp)
jal ra, _start_trap_rust
lw ra, 0*4(sp)
lw t0, 1*4(sp)
lw t1, 2*4(sp)
lw t2, 3*4(sp)
lw t3, 4*4(sp)
lw t4, 5*4(sp)
lw t5, 6*4(sp)
lw t6, 7*4(sp)
lw a0, 8*4(sp)
lw a1, 9*4(sp)
lw a2, 10*4(sp)
lw a3, 11*4(sp)
lw a4, 12*4(sp)
lw a5, 13*4(sp)
lw a6, 14*4(sp)
lw a7, 15*4(sp)
addi sp, sp, 16*4
mret
/* Make sure there is an abort when linking */
.section .init
.globl abort
abort:
jal zero, _start