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gil 2024-05-14 10:06:57 -05:00
parent c22e3e4376
commit 4c3bfa3052
1 changed files with 22 additions and 22 deletions
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44
src/main.rs
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@ -14,33 +14,33 @@ mod uart;
unsafe extern "C" fn _start() -> ! { unsafe extern "C" fn _start() -> ! {
use core::arch::asm; use core::arch::asm;
asm!( asm!(
// before we use the `la` pseudo-instruction for the first time, // before we use the `la` pseudo-instruction for the first time,
// we need to set `gp` (google linker relaxation) // we need to set `gp` (google linker relaxation)
".option push", ".option push",
".option norelax", ".option norelax",
"la gp, _global_pointer", "la gp, _global_pointer",
".option pop", ".option pop",
// set the stack pointer // set the stack pointer
"la sp, _init_stack_top", "la sp, _init_stack_top",
"la sp, _init_stack_top", "la sp, _init_stack_top",
// clear the BSS // clear the BSS
"la t0, _bss_start", "la t0, _bss_start",
"la t1, _bss_end", "la t1, _bss_end",
"bgeu t0, t1, 2f", "bgeu t0, t1, 2f",
"1:", "1:",
"sb zero, 0(t0)", "sb zero, 0(t0)",
"addi t0, t0, 1", "addi t0, t0, 1",
"bne t0, t1, 1b", "bne t0, t1, 1b",
"2:", "2:",
// BSS is clear! // BSS is clear!
// "tail-call" to {entry} (call without saving a return address) // "tail-call" to {entry} (call without saving a return address)
"tail {entry}", "tail {entry}",
entry = sym entry, // {entry} refers to the function [entry] below entry = sym entry, // {entry} refers to the function [entry] below
options(noreturn) // we must handle "returning" from assembly options(noreturn) // we must handle "returning" from assembly
); );
} }
@ -73,4 +73,4 @@ fn on_panic(_info: &PanicInfo) -> ! {
loop {} loop {}
} }
// TODO unit testing // TODO unit testing