sandbox: add initjmp()
Add initjm[() to sandbox, a non-standard extension to setjmp()/
longjmp() allowing to initialize a jump buffer with a function pointer
and a stack pointer. This will be useful to later introduce threads.
With this new function it becomes possible to longjmp() to a particular
function pointer (rather than to a point previously reached during
program execution as is the case with setjmp()), and with a custom stack.
Both things are needed to spin off a new thread. Then the usual
setjmp()/longjmp() pair is enough to save and restore a context, i.e.,
switch thread. The implementation is taken verbatim from barebox [1] with
the exception of the additional stack_sz argument. It is quite complex
because contrary to U-Boot platform code we don't know how the system's
C library implements the jump buffer, so we can't just write the function
and stack pointers into it.
[1] https://github.com/barebox/barebox/blob/b2a15c383ddc/arch/sandbox/os/setjmp.c
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index aa60c5f..ea33d07 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -180,6 +180,7 @@
config SANDBOX
bool "Sandbox"
select HAVE_SETJMP
+ select HAVE_INITJMP
select ARCH_SUPPORTS_LTO
select BOARD_LATE_INIT
select BZIP2