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base: extend thread test for stack alignment

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Christian Helmuth 2014-02-05 17:05:32 +01:00 committed by Norman Feske
parent 9c9f67d0d6
commit 41d5959ae5
1 changed files with 63 additions and 1 deletions
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64
base/src/test/thread/main.cc
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@ -20,6 +20,10 @@
using namespace Genode;
/*********************+********************
** Thread-context allocator concurrency **
******************************************/
template <int CHILDREN>
struct Helper : Thread<0x2000>
{
@ -59,6 +63,63 @@ static void test_context_alloc()
}
/*********************
** Stack alignment **
*********************/
/*
* Aligned FPU instruction accesses are very useful to identify stack-alignment
* issues. Fortunately, GCC generates pushes of FPU register content for
* vararg functions if floating-point values are passed to the function.
*/
static void test_stack_alignment_varargs(char const *format, ...) __attribute__((noinline));
static void test_stack_alignment_varargs(char const *format, ...)
{
va_list list;
va_start(list, format);
vprintf(format, list);
va_end(list);
}
static void log_stack_address(char const *who)
{
long dummy;
printf("%s stack @ %p\n", who, &dummy);
}
struct Stack_helper : Thread<0x2000>
{
Stack_helper() : Thread<0x2000>("stack_helper") { }
void entry()
{
log_stack_address("helper");
test_stack_alignment_varargs("%f\n%g\n", 3.142, 2.718);
}
};
static void test_stack_alignment()
{
Stack_helper helper;
helper.start();
helper.join();
log_stack_address("main");
test_stack_alignment_varargs("%f\n%g\n", 3.142, 2.718);
}
/****************************
** Main-thread stack area **
****************************/
static void test_main_thread()
{
/* check wether my thread object exists */
@ -91,8 +152,9 @@ static void test_main_thread()
int main()
{
try {
test_main_thread();
test_context_alloc();
test_stack_alignment();
test_main_thread();
} catch (int error) {
return error;
}