linux-kernel - [PATCH nolibc 42/61] tools/nolibc/stdlib: implement abort()

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Message-Id: <20220419004225.3952530-42-paulmck@kernel.org>
Date:   Mon, 18 Apr 2022 17:42:06 -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 42/61] tools/nolibc/stdlib: implement abort()

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

libgcc uses it for certain divide functions, so it must be exported. Like
for memset() we do that in its own section so that the linker can strip
it when not needed.

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/stdlib.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index b46bebd48ba2..733105c574ee 100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -23,6 +23,14 @@ static __attribute__((unused)) char itoa_buffer[21];
  * As much as possible, please keep functions alphabetically sorted.
  */
 
+/* must be exported, as it's used by libgcc for various divide functions */
+__attribute__((weak,unused,noreturn,section(".text.nolibc_abort")))
+void abort(void)
+{
+	sys_kill(sys_getpid(), SIGABRT);
+	for (;;);
+}
+
 static __attribute__((unused))
 long atol(const char *s)
 {
-- 
2.31.1.189.g2e36527f23