2021-05-09 16:35:40 +02:00
|
|
|
#ifndef __FXLIBC_TARGET_CASIOWIN-FX_TRAPA_H__
|
|
|
|
|
# define __FXLIBC_TARGET_CASIOWIN-FX_TRAPA_H__
|
2020-10-14 11:45:08 +02:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
** Normally the SH3/SH4 processor provide a "trapa" instruction which allow
|
|
|
|
|
** tipping between userland and kernel. But Casio's don't use this method
|
|
|
|
|
** (this is why we are always in "privilegied mode" and we can do whatever
|
|
|
|
|
** we whant) but use custom calling convention to access the syscall call.
|
|
|
|
|
**
|
|
|
|
|
** The convention whant that the user jump into the syscall trampoline code
|
|
|
|
|
** located at 0x80010070 for fx9860g and 0x80020070 for fxcg20/50.
|
|
|
|
|
*/
|
|
|
|
|
#ifdef __SUPPORT_CASIO_ABI_FX9860G
|
|
|
|
|
# define casio_trapa(id) \
|
|
|
|
|
mov.l syscall_table, r2 ;\
|
|
|
|
|
mov.l syscall_id, r0 ;\
|
|
|
|
|
jmp @r2 ;\
|
|
|
|
|
nop ;\
|
|
|
|
|
.align 4 ;\
|
|
|
|
|
syscall_table: .long 0x80010070 ;\
|
|
|
|
|
syscall_id: .long id
|
|
|
|
|
#endif
|
|
|
|
|
|
2021-05-09 16:35:40 +02:00
|
|
|
#endif /*__FXLIBC_TARGET_CASIOWIN-FX_TRAPA_H__*/
|
