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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2021-03-10 09:47:48 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-03-17 11:55:30 +0100 |
| commit | e74e330216baff384b844fde06720b022614168b (patch) | |
| tree | bbd2baba1378e43b36d37b65dac48f5d1f4be3a6 /arch/sandbox/Makefile | |
| parent | 01064a3c91492e09c13c2d158f1d2fa63cb90468 (diff) | |
| download | barebox-e74e330216baff384b844fde06720b022614168b.tar.gz barebox-e74e330216baff384b844fde06720b022614168b.tar.xz | |
sandbox: asm: implement setjmp/longjmp/initjmp
To extend incoming bthread support to sandbox, implement setjmp, longjmp
and initjmp. Unlike bare metal platforms, setjmp() and longjmp() are
readily provided on standard-conforming hosted platforms. initjmp() on
the other hand requires us to be able to invoke a function with a
user-supplied stack pointer, which isn't possible in standard C.
For POSIX systems, there are two methods to portably achieve this though:
- Use makecontext(2) to set up a new context. makecontext(2) was however
removed in POSIX.1-2008 and at least GCC 10.2.1 ASan complains that it
"doesn't fully support makecontext/swapcontext functions and may
produce false positives in some cases!"
- Use sigaltstack to set a new signal stack, raise the signal call,
setjmp in the signal handler to store the new stack pointer, return
regularly from signal handler and then longjmp back
Both methods are implemented in QEMU. While QEMU uses the makecontext
method by default, for the reasons described, import the second implementation
and use it implement initjmp.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/sandbox/Makefile')
| -rw-r--r-- | arch/sandbox/Makefile | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/sandbox/Makefile b/arch/sandbox/Makefile index ea594944e4..5fc7e227be 100644 --- a/arch/sandbox/Makefile +++ b/arch/sandbox/Makefile @@ -27,7 +27,8 @@ KBUILD_CFLAGS += -Dmalloc=barebox_malloc -Dcalloc=barebox_calloc \ -Dftruncate=barebox_ftruncate -Dasprintf=barebox_asprintf \ -Dopendir=barebox_opendir -Dreaddir=barebox_readdir \ -Dclosedir=barebox_closedir -Dreadlink=barebox_readlink \ - -Doptarg=barebox_optarg -Doptind=barebox_optind + -Doptarg=barebox_optarg -Doptind=barebox_optind \ + -Dsetjmp=barebox_setjmp -Dlongjmp=barebox_longjmp machdirs := $(patsubst %,arch/sandbox/mach-%/,$(machine-y)) @@ -64,7 +65,7 @@ endif BAREBOX_LDFLAGS += \ -Wl,-T,$(BAREBOX_LDS) \ -Wl,--whole-archive $(BAREBOX_OBJS) -Wl,--no-whole-archive \ - -lrt $(SDL_LIBS) $(FTDI1_LIBS) \ + -lrt -pthread $(SDL_LIBS) $(FTDI1_LIBS) \ $(SANITIZER_LIBS) cmd_barebox__ = $(CC) -o $@ $(BAREBOX_LDFLAGS) |