diff options
Diffstat (limited to 'c/src/lib/libcpu/sparc64/shared/syscall/sparc64-syscall.S')
| -rw-r--r-- | c/src/lib/libcpu/sparc64/shared/syscall/sparc64-syscall.S | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/c/src/lib/libcpu/sparc64/shared/syscall/sparc64-syscall.S b/c/src/lib/libcpu/sparc64/shared/syscall/sparc64-syscall.S deleted file mode 100644 index ffd6e8538d..0000000000 --- a/c/src/lib/libcpu/sparc64/shared/syscall/sparc64-syscall.S +++ /dev/null @@ -1,126 +0,0 @@ -/* - * 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 (c) 2010. Gedare Bloom. - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#include <rtems/asm.h> -#include "sparc64-syscall.h" - - -.seg "text" -/* - * system call - * - * On entry: - * g4[AG | GL=1] = tstate (from trap table) - * g2[AG | GL=1] = trap vector # (256) - * g3[AG | GL=1] = address of SYM(syscall) - * g4[AG | GL-1] = system call id - * if arch = sun4v: - * We need to back to GL-1 to read the system call id. - * on sun4u: - * We need to go back to the normal globals to read the system call id. - * - * First thing is to return to the previous set of globals, so - * that the system call id can be read. The syscall code needs - * to re-read tstate. - * - * syscall should only ever be entered by ta 0 being called explicitly - * by a function that knows what is happening. This means the syscall - * code can safely use any scratch registers and the %o registers. - */ - - -PUBLIC(syscall) - - - SYM(syscall): - mov %g0, %g4 ! clear %g4 at this GL -#if defined (SUN4U) - rdpr %pstate, %g1 - andn %g1, SPARC_PSTATE_AG_MASK, %g1 - wrpr %g1, %g0, %pstate ! go to regular globals -#elif defined (SUN4V) - rdpr %gl, %g1 - dec %g1 - wrpr %g0, %g1, %gl ! go back to GL = GL - 1 -#endif - - subcc %g4, 2, %g0 - bne 3f - rdpr %tstate, %g5 ! re-read tstate, use delay slot - - ! syscall 2, disable interrupts - rdpr %pil, %g1 - and %g5, SPARC_TSTATE_IE_MASK, %o0 - or %o0, %g1, %o0 ! return TSTATE_IE | PIL - wrpr %g0, 0xf, %pil ! set PIL to 15 - andn %g5, SPARC_TSTATE_IE_MASK, %g1 - wrpr %g0, %g1, %tstate ! disable interrupts in trap state - ba,a 9f - - 3: ! syscall 3, enable interrupts - subcc %g4, 3, %g0 - bne 1f - and %o0, 0xf, %g1 - wrpr %g0, %g1, %pil ! restore PIL -! and %o0, SPARC_TSTATE_IE_MASK, %g1 -! or %g5, %g1, %g1 ! restore saved IE - or %g5, SPARC_TSTATE_IE_MASK, %g1 ! restore IE (safe?) - wrpr %g0, %g1, %tstate - ba,a 9f - - 1: - ba,a 1b ! spin. taking a trap here -> htrap - - 9: ! leave - mov 0, %g4 ! clear %g4 - DONE - -PUBLIC(sparc_disable_interrupts) - - SYM(sparc_disable_interrupts): - mov SYS_irqdis, %g4 - ta 0 -#if 0 - rdpr %pstate, %g5 - rdpr %pil, %g1 - and %g5, SPARC_PSTATE_IE_MASK, %o0 - or %o0, %g1, %o0 ! return PSTATE_IE | PIL - wrpr %g0, 0xf, %pil ! set PIL to 15 - andn %g5, SPARC_PSTATE_IE_MASK, %g1 - wrpr %g0, %g1, %pstate ! disable interrupts -#endif - retl - nop - -PUBLIC(sparc_enable_interrupts) - - SYM(sparc_enable_interrupts): - mov SYS_irqen, %g4 - ta 0 -#if 0 - rdpr %pstate, %g5 - and %o0, 0xf, %g1 - wrpr %g0, %g1, %pil ! restore PIL - and %o0, SPARC_PSTATE_IE_MASK, %g1 - or %g5, %g1, %g1 ! restore saved IE -! or %g5, SPARC_PSTATE_IE_MASK, %g1 ! set IE regardless of old (safe?) - wrpr %g0, %g1, %pstate -#endif - retl - nop - - /* end of file */ |