[v4,1/5] LoongArch: Use la.pcrel instead of la.abs when it's trivially possible
Commit Message
From: Xi Ruoyao <xry111@xry111.site>
Let's start to kill la.abs inpreparation for the subsequent support of the
PIE kernel.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
---
arch/loongarch/include/asm/stackframe.h | 2 +-
arch/loongarch/include/asm/uaccess.h | 1 -
arch/loongarch/kernel/entry.S | 2 +-
arch/loongarch/kernel/head.S | 2 +-
arch/loongarch/mm/tlbex.S | 3 +--
5 files changed, 4 insertions(+), 6 deletions(-)
Comments
Hi, Youling,
On Fri, Feb 10, 2023 at 4:47 PM Youling Tang <tangyouling@loongson.cn> wrote:
>
> From: Xi Ruoyao <xry111@xry111.site>
>
> Let's start to kill la.abs inpreparation for the subsequent support of the
> PIE kernel.
>
> Signed-off-by: Xi Ruoyao <xry111@xry111.site>
> ---
> arch/loongarch/include/asm/stackframe.h | 2 +-
> arch/loongarch/include/asm/uaccess.h | 1 -
> arch/loongarch/kernel/entry.S | 2 +-
> arch/loongarch/kernel/head.S | 2 +-
> arch/loongarch/mm/tlbex.S | 3 +--
> 5 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
> index 4ca953062b5b..7deb043ce387 100644
> --- a/arch/loongarch/include/asm/stackframe.h
> +++ b/arch/loongarch/include/asm/stackframe.h
> @@ -90,7 +90,7 @@
> .endm
>
> .macro set_saved_sp stackp temp temp2
> - la.abs \temp, kernelsp
> + la.pcrel \temp, kernelsp
> #ifdef CONFIG_SMP
> LONG_ADD \temp, \temp, u0
> #endif
> diff --git a/arch/loongarch/include/asm/uaccess.h b/arch/loongarch/include/asm/uaccess.h
> index 255899d4a7c3..0d22991ae430 100644
> --- a/arch/loongarch/include/asm/uaccess.h
> +++ b/arch/loongarch/include/asm/uaccess.h
> @@ -22,7 +22,6 @@
> extern u64 __ua_limit;
>
> #define __UA_ADDR ".dword"
> -#define __UA_LA "la.abs"
> #define __UA_LIMIT __ua_limit
>
> /*
> diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S
> index d53b631c9022..2566977f2f68 100644
> --- a/arch/loongarch/kernel/entry.S
> +++ b/arch/loongarch/kernel/entry.S
> @@ -20,7 +20,7 @@
> .align 5
> SYM_FUNC_START(handle_syscall)
> csrrd t0, PERCPU_BASE_KS
> - la.abs t1, kernelsp
> + la.pcrel t1, kernelsp
Retab the whole function to align the first parameter, please.
Huacai
> add.d t1, t1, t0
> move t2, sp
> ld.d sp, t1, 0
> diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
> index 57bada6b4e93..aa6181714ec3 100644
> --- a/arch/loongarch/kernel/head.S
> +++ b/arch/loongarch/kernel/head.S
> @@ -117,7 +117,7 @@ SYM_CODE_START(smpboot_entry)
> li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0
> csrwr t0, LOONGARCH_CSR_EUEN
>
> - la.abs t0, cpuboot_data
> + la.pcrel t0, cpuboot_data
> ld.d sp, t0, CPU_BOOT_STACK
> ld.d tp, t0, CPU_BOOT_TINFO
>
> diff --git a/arch/loongarch/mm/tlbex.S b/arch/loongarch/mm/tlbex.S
> index 58781c6e4191..3dd2a9615cd9 100644
> --- a/arch/loongarch/mm/tlbex.S
> +++ b/arch/loongarch/mm/tlbex.S
> @@ -24,8 +24,7 @@
> move a0, sp
> REG_S a2, sp, PT_BVADDR
> li.w a1, \write
> - la.abs t0, do_page_fault
> - jirl ra, t0, 0
> + bl do_page_fault
> RESTORE_ALL_AND_RET
> SYM_FUNC_END(tlb_do_page_fault_\write)
> .endm
> --
> 2.37.3
>
>
@@ -90,7 +90,7 @@
.endm
.macro set_saved_sp stackp temp temp2
- la.abs \temp, kernelsp
+ la.pcrel \temp, kernelsp
#ifdef CONFIG_SMP
LONG_ADD \temp, \temp, u0
#endif
@@ -22,7 +22,6 @@
extern u64 __ua_limit;
#define __UA_ADDR ".dword"
-#define __UA_LA "la.abs"
#define __UA_LIMIT __ua_limit
/*
@@ -20,7 +20,7 @@
.align 5
SYM_FUNC_START(handle_syscall)
csrrd t0, PERCPU_BASE_KS
- la.abs t1, kernelsp
+ la.pcrel t1, kernelsp
add.d t1, t1, t0
move t2, sp
ld.d sp, t1, 0
@@ -117,7 +117,7 @@ SYM_CODE_START(smpboot_entry)
li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0
csrwr t0, LOONGARCH_CSR_EUEN
- la.abs t0, cpuboot_data
+ la.pcrel t0, cpuboot_data
ld.d sp, t0, CPU_BOOT_STACK
ld.d tp, t0, CPU_BOOT_TINFO
@@ -24,8 +24,7 @@
move a0, sp
REG_S a2, sp, PT_BVADDR
li.w a1, \write
- la.abs t0, do_page_fault
- jirl ra, t0, 0
+ bl do_page_fault
RESTORE_ALL_AND_RET
SYM_FUNC_END(tlb_do_page_fault_\write)
.endm