linux-kernel - [PATCH nolibc 33/61] tools/nolibc/arch: mark the

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Date:   Mon, 18 Apr 2022 17:41:57 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...com, w@....eu,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH nolibc 33/61] tools/nolibc/arch: mark the _start symbol as weak

From: Willy Tarreau <w@....eu>

By doing so we can link together multiple C files that have been compiled
with nolibc and which each have a _start symbol.

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/arch-aarch64.h | 1 +
 tools/include/nolibc/arch-arm.h     | 1 +
 tools/include/nolibc/arch-i386.h    | 1 +
 tools/include/nolibc/arch-mips.h    | 1 +
 tools/include/nolibc/arch-riscv.h   | 1 +
 tools/include/nolibc/arch-x86_64.h  | 1 +
 6 files changed, 6 insertions(+)

diff --git a/tools/include/nolibc/arch-aarch64.h b/tools/include/nolibc/arch-aarch64.h
index 443de5fb7f54..87d9e434820c 100644
--- a/tools/include/nolibc/arch-aarch64.h
+++ b/tools/include/nolibc/arch-aarch64.h
@@ -183,6 +183,7 @@ struct sys_stat_struct {
 
 /* startup code */
 asm(".section .text\n"
+    ".weak _start\n"
     ".global _start\n"
     "_start:\n"
     "ldr x0, [sp]\n"              // argc (x0) was in the stack
diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-arm.h
index 66f687ad987f..001a3c8c9ad5 100644
--- a/tools/include/nolibc/arch-arm.h
+++ b/tools/include/nolibc/arch-arm.h
@@ -176,6 +176,7 @@ struct sys_stat_struct {
 
 /* startup code */
 asm(".section .text\n"
+    ".weak _start\n"
     ".global _start\n"
     "_start:\n"
 #if defined(__THUMBEB__) || defined(__THUMBEL__)
diff --git a/tools/include/nolibc/arch-i386.h b/tools/include/nolibc/arch-i386.h
index 32f42e2cee26..d7e4d53325a3 100644
--- a/tools/include/nolibc/arch-i386.h
+++ b/tools/include/nolibc/arch-i386.h
@@ -175,6 +175,7 @@ struct sys_stat_struct {
  *
  */
 asm(".section .text\n"
+    ".weak _start\n"
     ".global _start\n"
     "_start:\n"
     "pop %eax\n"                // argc   (first arg, %eax)
diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h
index e330201dde6a..c9a6aac87c6d 100644
--- a/tools/include/nolibc/arch-mips.h
+++ b/tools/include/nolibc/arch-mips.h
@@ -190,6 +190,7 @@ struct sys_stat_struct {
 
 /* startup code, note that it's called __start on MIPS */
 asm(".section .text\n"
+    ".weak __start\n"
     ".set nomips16\n"
     ".global __start\n"
     ".set    noreorder\n"
diff --git a/tools/include/nolibc/arch-riscv.h b/tools/include/nolibc/arch-riscv.h
index 9d5ff78f606b..bc10b7b5706d 100644
--- a/tools/include/nolibc/arch-riscv.h
+++ b/tools/include/nolibc/arch-riscv.h
@@ -184,6 +184,7 @@ struct sys_stat_struct {
 
 /* startup code */
 asm(".section .text\n"
+    ".weak _start\n"
     ".global _start\n"
     "_start:\n"
     ".option push\n"
diff --git a/tools/include/nolibc/arch-x86_64.h b/tools/include/nolibc/arch-x86_64.h
index 83c4b458ada7..fe517c16cd4d 100644
--- a/tools/include/nolibc/arch-x86_64.h
+++ b/tools/include/nolibc/arch-x86_64.h
@@ -198,6 +198,7 @@ struct sys_stat_struct {
  *
  */
 asm(".section .text\n"
+    ".weak _start\n"
     ".global _start\n"
     "_start:\n"
     "pop %rdi\n"                // argc   (first arg, %rdi)
-- 
2.31.1.189.g2e36527f23