diff options
Diffstat (limited to 'c/src/lib/libcpu/sparc/syscall/syscall.S')
| -rw-r--r-- | c/src/lib/libcpu/sparc/syscall/syscall.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/sparc/syscall/syscall.S b/c/src/lib/libcpu/sparc/syscall/syscall.S new file mode 100644 index 0000000000..fe9b512d81 --- /dev/null +++ b/c/src/lib/libcpu/sparc/syscall/syscall.S @@ -0,0 +1,78 @@ +/* + * 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 <asm.h> +#include "syscall.h" + + .seg "text" + /* + * system call + * + * On entry: + * + * l0 = psr (from trap table) + * l1 = pc + * l2 = npc + * g1 = system call id + */ + + PUBLIC(syscall) + +SYM(syscall): + + subcc %g1, 2, %g0 ! syscall 2, disable interrupts + bne 3f + or %l0, 0x0f00, %l4 ! set PIL=15 + mov %l4, %psr + or %l0, SPARC_PSR_ET_MASK, %i0 ! return old psr with ET=1 + ba,a 9f +3: + subcc %g1, 3, %g0 ! syscall 3, enable interrupts + bne 1f + and %i0, SPARC_PSR_PIL_MASK, %l4 + andn %l0, SPARC_PSR_PIL_MASK, %l5 + or %l5, %l4, %l4 + mov %l4, %psr + ba,a 9f + +1: + ta 0 ! halt +9: ! leave + mov 0, %g1 ! clear %g1 + jmpl %l2, %g0 + rett %l2 + 4 + + PUBLIC(sparc_disable_interrupts) + +SYM(sparc_disable_interrupts): + + mov SYS_irqdis, %g1 + ta 0 + retl + nop + + PUBLIC(sparc_enable_interrupts) + +SYM(sparc_enable_interrupts): + + mov SYS_irqen, %g1 + ta 0 + retl + nop + +/* end of file */ |