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| author | Jim Wilson <jimw@sifive.com> | 2019-05-22 17:41:25 -0700 |
|---|---|---|
| committer | Jim Wilson <jimw@sifive.com> | 2019-05-22 17:41:25 -0700 |
| commit | 77ac27dcf8ebd6ea314b32e563f3d128fe431581 (patch) | |
| tree | 937fe2b8810531e7a924ff9e71acb9a4c16da647 /libgloss | |
| parent | 5c86f0da5f07791c01477380a0635c6d38a9b33b (diff) | |
| download | newlib-77ac27dcf8ebd6ea314b32e563f3d128fe431581.zip newlib-77ac27dcf8ebd6ea314b32e563f3d128fe431581.tar.gz newlib-77ac27dcf8ebd6ea314b32e563f3d128fe431581.tar.bz2 | |
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.
Diffstat (limited to 'libgloss')
| -rw-r--r-- | libgloss/riscv/crt0.S | 13 |
1 files changed, 13 insertions, 0 deletions
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 |