| 1,5 → 1,5 |
|---|
| # |
| # Copyright (C) 2006 Martin Decky |
| # Copyright (C) 2005 Jakub Jermar |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| 26,14 → 26,80 |
|---|
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| .text |
| #include <libarch/context_offset.h> |
| |
| /** |
| * Both context_save_arch() and context_restore_arch() are |
| * leaf-optimized procedures. This kind of optimization |
| * is very important and prevents any implicit window |
| * spill/fill/clean traps in these very core kernel |
| * functions. |
| */ |
| |
| .text |
| |
| .global context_save |
| .global context_restore |
| |
| #include <libarch/context_offset.h> |
| .macro CONTEXT_STORE r |
| stx %sp, [\r + OFFSET_SP] |
| stx %o7, [\r + OFFSET_PC] |
| stx %i0, [\r + OFFSET_I0] |
| stx %i1, [\r + OFFSET_I1] |
| stx %i2, [\r + OFFSET_I2] |
| stx %i3, [\r + OFFSET_I3] |
| stx %i4, [\r + OFFSET_I4] |
| stx %i5, [\r + OFFSET_I5] |
| stx %fp, [\r + OFFSET_FP] |
| stx %i7, [\r + OFFSET_I7] |
| stx %l0, [\r + OFFSET_L0] |
| stx %l1, [\r + OFFSET_L1] |
| stx %l2, [\r + OFFSET_L2] |
| stx %l3, [\r + OFFSET_L3] |
| stx %l4, [\r + OFFSET_L4] |
| stx %l5, [\r + OFFSET_L5] |
| stx %l6, [\r + OFFSET_L6] |
| stx %l7, [\r + OFFSET_L7] |
| stx %g7, [\r + OFFSET_TP] |
| .endm |
| |
| .macro CONTEXT_LOAD r |
| ldx [\r + OFFSET_SP], %sp |
| ldx [\r + OFFSET_PC], %o7 |
| ldx [\r + OFFSET_I0], %i0 |
| ldx [\r + OFFSET_I1], %i1 |
| ldx [\r + OFFSET_I2], %i2 |
| ldx [\r + OFFSET_I3], %i3 |
| ldx [\r + OFFSET_I4], %i4 |
| ldx [\r + OFFSET_I5], %i5 |
| ldx [\r + OFFSET_FP], %fp |
| ldx [\r + OFFSET_I7], %i7 |
| ldx [\r + OFFSET_L0], %l0 |
| ldx [\r + OFFSET_L1], %l1 |
| ldx [\r + OFFSET_L2], %l2 |
| ldx [\r + OFFSET_L3], %l3 |
| ldx [\r + OFFSET_L4], %l4 |
| ldx [\r + OFFSET_L5], %l5 |
| ldx [\r + OFFSET_L6], %l6 |
| ldx [\r + OFFSET_L7], %l7 |
| ldx [\r + OFFSET_TP], %g7 |
| .endm |
| |
| context_save: |
| CONTEXT_STORE %o0 |
| retl |
| mov 1, %o0 ! context_save_arch returns 1 |
| |
| |
| context_restore: |
| # |
| # Flush all active windows. |
| # This is essential, because CONTEXT_LOAD overwrites |
| # %sp of CWP - 1 with the value written to %fp of CWP. |
| # Flushing all active windows mitigates this problem |
| # as CWP - 1 becomes the overlap window. |
| # |
| flushw |
| |
| CONTEXT_LOAD %o0 |
| retl |
| xor %o0, %o0, %o0 ! context_restore_arch returns 0 |