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riscv: Optimize source end address calculation in start.S

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The __bss_start is the source end address hence load its address
directly into register 't2' for optimization.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Rick Chen <rick@andestech.com>
This commit is contained in:
Bin Meng
2023-04-13 14:20:00 +08:00
committed by Leo Yu-Chi Liang
parent db9a7e51bf
commit 883f553e6b
1 changed files with 1 additions and 3 deletions
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4
arch/riscv/cpu/start.S
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@@ -283,9 +283,7 @@ stack_setup:
beq t0, s4, clear_bss /* skip relocation */
mv t1, s4 /* t1 <- scratch for copy_loop */
la t3, __bss_start
sub t3, t3, t0 /* t3 <- __bss_start_ofs */
add t2, t0, t3 /* t2 <- source end address */
la t2, __bss_start /* t2 <- source end address */
copy_loop:
LREG t5, 0(t0)