linux-kernel - [RFC PATCH v3 1/3] LoongArch: Add TI_SYSCALL in output_thread_info

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Message-Id: <1655288973-6066-2-git-send-email-yangtiezhu@loongson.cn>
Date:   Wed, 15 Jun 2022 18:29:31 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>
Cc:     Xuefeng Li <lixuefeng@...ngson.cn>,
        Jianmin Lv <lvjianmin@...ngson.cn>, Jun Yi <yijun@...ngson.cn>,
        Rui Wang <wangrui@...ngson.cn>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v3 1/3] LoongArch: Add TI_SYSCALL in output_thread_info_defines()

The initial idea was to store the syscall number in PT_R11,
and then we can get the syscall number from PT_R11 to check
before SAVE and RESTORE in handle_syscall, but PT_R11 may
be overwritten by the signal handler and the syscall number
is lost.

Add TI_SYSCALL in output_thread_info_defines(), then we can
store the syscall number in TI_SYSCALL. This is preparation
for later patch.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 arch/loongarch/kernel/asm-offsets.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
index bfb65eb..4757ebe 100644
--- a/arch/loongarch/kernel/asm-offsets.c
+++ b/arch/loongarch/kernel/asm-offsets.c
@@ -81,6 +81,7 @@ void output_thread_info_defines(void)
 	OFFSET(TI_CPU, thread_info, cpu);
 	OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
 	OFFSET(TI_REGS, thread_info, regs);
+	OFFSET(TI_SYSCALL, thread_info, syscall);
 	DEFINE(_THREAD_SIZE, THREAD_SIZE);
 	DEFINE(_THREAD_MASK, THREAD_MASK);
 	DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE);
-- 
2.1.0