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1.1 root 1: #include "pstate.h"
2: #include <asm/asi.h>
3: #define ASI_BP ASI_M_BYPASS
4: #define REGWIN_SZ 0x40
5:
6: .globl __switch_context, __switch_context_nosave, __exit_context, halt
7:
8: .text
9: .align 4
10: .register %g2, #scratch
11: .register %g3, #scratch
12: .register %g6, #scratch
13: .register %g7, #scratch
14:
15: /*
16: * Switch execution context
17: * This saves registers in the stack, then
18: * switches the stack, and restores everything from the new stack.
19: * This function takes no argument. New stack pointer is
20: * taken from global variable __context, and old stack pointer
21: * is also saved to __context. This way we can just jump to
22: * this routine to get back to the original context.
23: */
24:
25: /* XXX: totally bogus for sparc, need to save and restore all windows */
26: __switch_context:
27:
28: /* make sure caller's windows are on caller's stack */
29: flushw;
30:
31: /* Save everything in current stack */
32:
33: setx __context, %g2, %g1
34: stx %g3, [%g1 + 24]
35: stx %g4, [%g1 + 32]
36: stx %g5, [%g1 + 40]
37: stx %g6, [%g1 + 48]
38: stx %g7, [%g1 + 56]
39:
40: stx %o0, [%g1 + 64]
41: stx %o1, [%g1 + 72]
42: stx %o2, [%g1 + 80]
43: stx %o3, [%g1 + 88]
44: stx %o4, [%g1 + 96]
45: stx %o5, [%g1 + 104]
46: stx %o6, [%g1 + 112]
47: stx %o7, [%g1 + 120]
48:
49: stx %l0, [%g1 + 128]
50: stx %l1, [%g1 + 136]
51: stx %l2, [%g1 + 144]
52: stx %l3, [%g1 + 152]
53: stx %l4, [%g1 + 160]
54: stx %l5, [%g1 + 168]
55: stx %l6, [%g1 + 176]
56: stx %l7, [%g1 + 184]
57:
58: stx %i0, [%g1 + 192]
59: stx %i1, [%g1 + 200]
60: stx %i2, [%g1 + 208]
61: stx %i3, [%g1 + 216]
62: stx %i4, [%g1 + 224]
63: stx %i5, [%g1 + 232]
64: stx %i6, [%g1 + 240]
65: stx %i7, [%g1 + 248]
66:
67: __switch_context_nosave:
68: /* Interrupts are not allowed... */
69: /* make sure caller's windows are on caller's stack */
70: flushw
71: /* Load all registers
72: */
73: setx __context, %g2, %g1
74: ldx [%g1], %g1
75: ldx [%g1 + 16], %g2
76: ldx [%g1 + 24], %g3
77: ldx [%g1 + 32], %g4
78: ldx [%g1 + 40], %g5
79: ldx [%g1 + 48], %g6
80: ldx [%g1 + 56], %g7
81:
82: ldx [%g1 + 64], %o0
83: ldx [%g1 + 72], %o1
84: ldx [%g1 + 80], %o2
85: ldx [%g1 + 88], %o3
86: ldx [%g1 + 96], %o4
87: ldx [%g1 + 104], %o5
88: ldx [%g1 + 112], %o6
89: ldx [%g1 + 120], %o7
90:
91: ldx [%g1 + 128], %l0
92: ldx [%g1 + 136], %l1
93: ldx [%g1 + 144], %l2
94: ldx [%g1 + 152], %l3
95: ldx [%g1 + 160], %l4
96: ldx [%g1 + 168], %l5
97: ldx [%g1 + 176], %l6
98: ldx [%g1 + 184], %l7
99:
100: ldx [%g1 + 192], %i0
101: ldx [%g1 + 200], %i1
102: ldx [%g1 + 208], %i2
103: ldx [%g1 + 216], %i3
104: ldx [%g1 + 224], %i4
105: ldx [%g1 + 232], %i5
106: ldx [%g1 + 240], %i6
107: ldx [%g1 + 248], %i7
108:
109: ldx [%g1 + 256], %g1
110: /* Finally, load new %pc */
111: jmp %g1
112: clr %g1
113:
114: __exit_context:
115: /* Get back to the original context */
116: call __switch_context
117: nop
118:
119: /* We get here if the other context attempt to switch to this
120: * dead context. This should not happen. */
121:
122: halt:
123: b halt
124: nop
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