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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | # |
27 | # |
| 28 | 28 | ||
| 29 | #include <arch/context_offset.h> |
29 | #include <arch/context_offset.h> |
| 30 | #include <arch/stack.h> |
30 | #include <arch/stack.h> |
| - | 31 | ||
| - | 32 | /** |
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| - | 33 | * Both context_save_arch() and context_restore_arch() are |
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| - | 34 | * leaf-optimized procedures. Both of them touch %sp and |
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| - | 35 | * %fp and thus break SCD 2.4 compliance. However, these |
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| - | 36 | * functions are special enough to be allowed this |
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| - | 37 | * kind of behavior. Moreover, this kind of optimization |
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| - | 38 | * is very important and prevents any window spill/ |
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| - | 39 | * fill/clean traps in these very core kernel functions. |
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| - | 40 | */ |
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| 31 | 41 | ||
| 32 | .text |
42 | .text |
| 33 | 43 | ||
| 34 | .global context_save_arch |
44 | .global context_save_arch |
| 35 | .global context_restore_arch |
45 | .global context_restore_arch |
| 36 | 46 | ||
| 37 | .macro CONTEXT_STORE r |
47 | .macro CONTEXT_STORE r |
| 38 | stx %o1, [\r + OFFSET_I1] |
48 | stx %o1, [\r + OFFSET_O1] |
| 39 | stx %o2, [\r + OFFSET_I2] |
49 | stx %o2, [\r + OFFSET_O2] |
| 40 | stx %o3, [\r + OFFSET_I3] |
50 | stx %o3, [\r + OFFSET_O3] |
| 41 | stx %o4, [\r + OFFSET_I4] |
51 | stx %o4, [\r + OFFSET_O4] |
| 42 | stx %o5, [\r + OFFSET_I5] |
52 | stx %o5, [\r + OFFSET_O5] |
| 43 | stx %o7, [\r + OFFSET_PC] |
53 | stx %o7, [\r + OFFSET_PC] |
| 44 | stx %sp, [\r + OFFSET_SP] |
54 | stx %sp, [\r + OFFSET_SP] |
| - | 55 | stx %fp, [\r + OFFSET_FP] |
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| 45 | .endm |
56 | .endm |
| 46 | 57 | ||
| 47 | .macro CONTEXT_LOAD r |
58 | .macro CONTEXT_LOAD r |
| 48 | ldx [\r + OFFSET_I1], %o1 |
59 | ldx [\r + OFFSET_O1], %o1 |
| 49 | ldx [\r + OFFSET_I2], %o2 |
60 | ldx [\r + OFFSET_O2], %o2 |
| 50 | ldx [\r + OFFSET_I3], %o3 |
61 | ldx [\r + OFFSET_O3], %o3 |
| 51 | ldx [\r + OFFSET_I4], %o4 |
62 | ldx [\r + OFFSET_O4], %o4 |
| 52 | ldx [\r + OFFSET_I5], %o5 |
63 | ldx [\r + OFFSET_O5], %o5 |
| 53 | ldx [\r + OFFSET_PC], %o7 |
64 | ldx [\r + OFFSET_PC], %o7 |
| 54 | ldx [\r + OFFSET_SP], %sp |
65 | ldx [\r + OFFSET_SP], %sp |
| - | 66 | ldx [\r + OFFSET_FP], %fp |
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| 55 | .endm |
67 | .endm |
| 56 | 68 | ||
| 57 | - | ||
| 58 | context_save_arch: |
69 | context_save_arch: |
| 59 | CONTEXT_STORE %o0 |
70 | CONTEXT_STORE %o0 |
| 60 | - | ||
| 61 | # context_save returns 1 |
- | |
| 62 | retl |
71 | retl |
| 63 | mov 1, %o0 |
72 | mov 1, %o0 ! context_save_arch returns 1 |
| 64 | 73 | ||
| 65 | context_restore_arch: |
74 | context_restore_arch: |
| - | 75 | # |
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| - | 76 | # Flush all active windows. |
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| - | 77 | # This is essential, because CONTEXT_LOAD overwrites |
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| - | 78 | # %sp of CWP - 1 with the value written to %fp of CWP. |
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| - | 79 | # Flushing all active windows mitigates this problem |
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| - | 80 | # as CWP - 1 becomes the overlap window. |
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| - | 81 | # |
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| - | 82 | flushw |
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| - | 83 | ||
| 66 | CONTEXT_LOAD %o0 |
84 | CONTEXT_LOAD %o0 |
| 67 | - | ||
| 68 | # context_restore returns 0 |
- | |
| 69 | retl |
85 | retl |
| 70 | xor %o0, %o0, %o0 |
86 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |