public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
* [PATCH v2 1/9] riscv: Optimize source end address calculation in start.S
@ 2023-04-13  6:20 Bin Meng
  2023-04-13  6:20 ` [PATCH v2 2/9] riscv: Optimize loading relocation type Bin Meng
                   ` (7 more replies)
  0 siblings, 8 replies; 14+ messages in thread
From: Bin Meng @ 2023-04-13  6:20 UTC (permalink / raw)
  To: u-boot; +Cc: Rick Chen, Leo, Nikita Shubin

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>
---

(no changes since v1)

 arch/riscv/cpu/start.S | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
index 4687bca3c9..3c8344c345 100644
--- a/arch/riscv/cpu/start.S
+++ b/arch/riscv/cpu/start.S
@@ -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)
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2024-02-14 11:16 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-04-13  6:20 [PATCH v2 1/9] riscv: Optimize source end address calculation in start.S Bin Meng
2023-04-13  6:20 ` [PATCH v2 2/9] riscv: Optimize loading relocation type Bin Meng
2023-04-13  6:20 ` [PATCH v2 3/9] tools: prelink-riscv: Cosmetic style fixes Bin Meng
2023-04-13  6:20 ` [PATCH v2 4/9] tools: prelink-riscv: Unmap the ELF image when done Bin Meng
2023-04-13  6:20 ` [PATCH v2 5/9] makefile: riscv: Drop useless argument of prelink-riscv Bin Meng
2023-04-13  6:20 ` [PATCH v2 6/9] riscv: Change to use positive offset to access relocation entries Bin Meng
2023-04-20  7:46   ` Leo Liang
2023-04-13  6:20 ` [PATCH v2 7/9] riscv: Avoid updating the link register Bin Meng
2023-04-20  7:47   ` Leo Liang
2023-04-13  6:20 ` [PATCH v2 8/9] riscv: spl: Remove relocation sections Bin Meng
2023-04-20  7:48   ` Leo Liang
2023-04-13  6:20 ` [PATCH v2 9/9] riscv: Update alignment for some sections in linker scripts Bin Meng
2023-04-20  7:49   ` Leo Liang
2024-02-14 11:15   ` Michal Simek

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox