On 22/07/2016 16:10, Sebastian Huber wrote:
On i386 the PC is stored on the stack frame:
#define _CPU_Context_Initialize( _the_context, _stack_base, _size, \
_isr, _entry_point, _is_fp,
_tls_area ) \
do { \
uint32_t _stack; \
\
(void) _is_fp; /* avoid warning for being unused */ \
if ( (_isr) ) (_the_context)->eflags = CPU_EFLAGS_INTERRUPTS_OFF; \
else (_the_context)->eflags = CPU_EFLAGS_INTERRUPTS_ON; \
\
_stack = ((uint32_t)(_stack_base)) + (_size); \
_stack &= ~ (CPU_STACK_ALIGNMENT - 1); \
_stack -= 2*sizeof(proc_ptr*); /* see above for why we need to do
this */ \
*((proc_ptr *)(_stack)) = (_entry_point); \
(_the_context)->ebp = (void *) 0; \
(_the_context)->esp = (void *) _stack; \
} while (0)
The stack pointer is part of the context. If you retrieve the PC from
here it should work for all threads.
All threads on the i386 arch or all threads on all archs?
I would like to make this simpler for all archs. I do not mind if we
require something being added to each arch to do this but I would like
an interface somewhere and somehow.
Chris
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