diff options
| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-11-22 10:13:27 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-11-28 16:08:43 +0100 |
| commit | 6a1b9e41521fffc0abc82cb4426fc0e4ca8ca17e (patch) | |
| tree | 55facda04d71966fbffe36c1c1b6de7d8dbf547d /c/src/lib/libcpu/sparc/syscall/syscall.S | |
| parent | score: Fix thread queue context initialization (diff) | |
| download | rtems-6a1b9e41521fffc0abc82cb4426fc0e4ca8ca17e.tar.bz2 | |
sparc: Optimize _ISR_Handler()
Use _Thread_Do_dispatch() instead of _Thread_Dispatch(). Restore the
PSR[EF] state of the interrupted context via new system call
syscall_irqdis_fp in case floating-point support is enabled.
Diffstat (limited to 'c/src/lib/libcpu/sparc/syscall/syscall.S')
| -rw-r--r-- | c/src/lib/libcpu/sparc/syscall/syscall.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/sparc/syscall/syscall.S b/c/src/lib/libcpu/sparc/syscall/syscall.S index 64c4805af6..d00aa03876 100644 --- a/c/src/lib/libcpu/sparc/syscall/syscall.S +++ b/c/src/lib/libcpu/sparc/syscall/syscall.S @@ -95,6 +95,43 @@ SYM(syscall_irqen): jmp %l2 ! Return to after TA 10. rett %l2 + 4 +#if SPARC_HAS_FPU == 1 + /* + * system call - Interrupt disable and set PSR[EF] according to caller + * specified %g1 + * + * On entry: + * + * g1 = the desired PSR[EF] value (from caller) + * 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_fp) + +SYM(syscall_irqdis_fp): + /* + * We cannot use an intermediate value for operations with the PSR[EF] + * bit since they use a 13-bit sign extension and PSR[EF] is bit 12. + */ + sethi %hi(SPARC_PSR_EF_MASK), %l4 + + andn %l3, %l4, %l3 ! Clear PSR[EF] + and %g1, %l4, %g1 ! Select PSR[EF] only from %g1 + or %l3, %g1, %l3 ! Set PSR[EF] according to %g1 + 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 +#endif + #if defined(RTEMS_PARAVIRT) PUBLIC(_SPARC_Get_PSR) |