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* [newlib-cygwin] RISC-V: Add _LITE_EXIT in crt0.S.
@ 2019-05-23 0:42 Jim Wilson
0 siblings, 0 replies; only message in thread
From: Jim Wilson @ 2019-05-23 0:42 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=77ac27dcf8ebd6ea314b32e563f3d128fe431581
commit 77ac27dcf8ebd6ea314b32e563f3d128fe431581
Author: Jim Wilson <jimw@sifive.com>
Date: Wed May 22 17:41:25 2019 -0700
RISC-V: Add _LITE_EXIT in crt0.S.
This patch adds _LITE_EXIT in crt0.S to enable "lite exit" technique in
RISC-V. The changes have been tested in riscv/riscv-gnu-toolchain by
riscv-dejagnu with riscv-sim.exp/riscv-sim-nano.exp.
Diff:
---
libgloss/riscv/crt0.S | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S
index 588becf..160c078 100644
--- a/libgloss/riscv/crt0.S
+++ b/libgloss/riscv/crt0.S
@@ -9,6 +9,8 @@
http://www.opensource.org/licenses.
*/
+#include "newlib.h"
+
#=========================================================================
# crt0.S : Entry point for RISC-V user programs
#=========================================================================
@@ -30,9 +32,20 @@ _start:
sub a2, a2, a0
li a1, 0
call memset
+#ifdef _LITE_EXIT
+ # Make reference to atexit weak to avoid unconditionally pulling in
+ # support code. Refer to comments in __atexit.c for more details.
+ .weak atexit
+ la a0, atexit
+ beqz a0, .Lweak_atexit
+ .weak __libc_fini_array
+#endif
la a0, __libc_fini_array # Register global termination functions
call atexit # to be called upon exit
+#ifdef _LITE_EXIT
+.Lweak_atexit:
+#endif
call __libc_init_array # Run global initialization functions
lw a0, 0(sp) # a0 = argc
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