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/*
* systrap.S
*
* This file contains emulated system calls using software trap 0.
* The following calls are supported:
*
* + SYS_exit (halt)
* + SYS_irqdis (disable interrupts)
* + SYS_irqset (set interrupt level)
*
* COPYRIGHT:
*
* COPYRIGHT (c) 1995. European Space Agency.
*
* This terms of the RTEMS license apply to this file.
*
*/
#include <rtems/asm.h>
#include "syscall.h"
.seg "text"
/*
* system call - halt
*
* On entry:
*
* l0 = psr (from trap table)
* l1 = pc
* l2 = npc
* g1 = system call id (1)
*
* System Call 1 (exit):
* g2 = additional exit code 1
* g3 = additional exit code 2
*/
PUBLIC(syscall)
SYM(syscall):
ta 0 ! syscall 1, halt with %g1,%g2,%g3 info
PUBLIC(sparc_syscall_exit)
SYM(sparc_syscall_exit):
mov SYS_exit, %g1
mov %o0, %g2 ! Additional exit code 1
mov %o1, %g3 ! Additional exit code 2
ta SPARC_SWTRAP_SYSCALL
/*
* system call - Interrupt Disable
*
* On entry:
*
* l0 = psr (from trap table)
* l1 = pc
* l2 = npc
* l3 = psr | SPARC_PSR_PIL_MASK
*
* On exit:
* g1 = old psr (to user)
*/
.align 32 ! Align to 32-byte cache-line
PUBLIC(syscall_irqdis)
SYM(syscall_irqdis):
mov %l3, %psr ! Set PSR. Write delay 3 instr
or %l0, SPARC_PSR_ET_MASK, %g1 ! return old PSR with ET=1
nop ! PSR write delay
jmp %l2 ! Return to after TA 9.
rett %l2 + 4
/*
* system call - Interrupt Enable
*
* On entry:
*
* l0 = psr (from trap table)
* l1 = pc
* l2 = npc
* l3 = psr & ~0x0f00
* g1 = new PIL to write (from user)
*/
.align 32 ! Align to 32-byte cache-line
PUBLIC(syscall_irqen)
SYM(syscall_irqen):
and %g1, SPARC_PSR_PIL_MASK, %l4 ! %l4 = (%g1 & 0xf00)
wr %l3, %l4, %psr ! PSR = (PSR & ~0xf00) ^ %l4
nop; nop ! PSR write delay;
jmp %l2 ! Return to after TA 10.
rett %l2 + 4
#if defined(RTEMS_PARAVIRT)
PUBLIC(_SPARC_Get_PSR)
SYM(_SPARC_Get_PSR):
retl
rd %psr, %o0
PUBLIC(_SPARC_Set_PSR)
SYM(_SPARC_Set_PSR):
mov %o0, %psr
nop
nop
nop
retl
nop
PUBLIC(_SPARC_Get_TBR)
SYM(_SPARC_Get_TBR):
retl
rd %tbr, %o0
PUBLIC(_SPARC_Set_TBR)
SYM(_SPARC_Set_TBR):
retl
wr %o0, 0, %tbr
#endif /* defined(RTEMS_PARAVIRT) */
/* end of file */
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