Text file
src/runtime/sys_plan9_amd64.s
Documentation: runtime
1// Copyright 2010 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include "go_asm.h"
6#include "go_tls.h"
7#include "textflag.h"
8
9TEXT runtime·open(SB),NOSPLIT,$0
10 MOVQ $14, BP
11 SYSCALL
12 MOVL AX, ret+16(FP)
13 RET
14
15TEXT runtime·pread(SB),NOSPLIT,$0
16 MOVQ $50, BP
17 SYSCALL
18 MOVL AX, ret+32(FP)
19 RET
20
21TEXT runtime·pwrite(SB),NOSPLIT,$0
22 MOVQ $51, BP
23 SYSCALL
24 MOVL AX, ret+32(FP)
25 RET
26
27// int32 _seek(int64*, int32, int64, int32)
28TEXT _seek<>(SB),NOSPLIT,$0
29 MOVQ $39, BP
30 SYSCALL
31 RET
32
33// int64 seek(int32, int64, int32)
34// Convenience wrapper around _seek, the actual system call.
35TEXT runtime·seek(SB),NOSPLIT,$32
36 LEAQ ret+24(FP), AX
37 MOVL fd+0(FP), BX
38 MOVQ offset+8(FP), CX
39 MOVL whence+16(FP), DX
40 MOVQ AX, 0(SP)
41 MOVL BX, 8(SP)
42 MOVQ CX, 16(SP)
43 MOVL DX, 24(SP)
44 CALL _seek<>(SB)
45 CMPL AX, $0
46 JGE 2(PC)
47 MOVQ $-1, ret+24(FP)
48 RET
49
50TEXT runtime·closefd(SB),NOSPLIT,$0
51 MOVQ $4, BP
52 SYSCALL
53 MOVL AX, ret+8(FP)
54 RET
55
56TEXT runtime·dupfd(SB),NOSPLIT,$0
57 MOVQ $5, BP
58 // Kernel expects each int32 arg to be 64-bit-aligned.
59 // The return value slot is where the kernel
60 // expects to find the second argument, so copy it there.
61 MOVL new+4(FP), AX
62 MOVL AX, ret+8(FP)
63 SYSCALL
64 MOVL AX, ret+8(FP)
65 RET
66
67TEXT runtime·exits(SB),NOSPLIT,$0
68 MOVQ $8, BP
69 SYSCALL
70 RET
71
72TEXT runtime·brk_(SB),NOSPLIT,$0
73 MOVQ $24, BP
74 SYSCALL
75 MOVL AX, ret+8(FP)
76 RET
77
78TEXT runtime·sleep(SB),NOSPLIT,$0
79 MOVQ $17, BP
80 SYSCALL
81 MOVL AX, ret+8(FP)
82 RET
83
84TEXT runtime·plan9_semacquire(SB),NOSPLIT,$0
85 MOVQ $37, BP
86 SYSCALL
87 MOVL AX, ret+16(FP)
88 RET
89
90TEXT runtime·plan9_tsemacquire(SB),NOSPLIT,$0
91 MOVQ $52, BP
92 SYSCALL
93 MOVL AX, ret+16(FP)
94 RET
95
96// func timesplit(u uint64) (sec int64, nsec int32)
97TEXT runtime·timesplit(SB),NOSPLIT,$0
98 MOVQ u+0(FP), AX
99 // generated code for
100 // func f(x uint64) (uint64, uint64) { return x/1000000000, x%1000000000 }
101 // adapted to reduce duplication
102 MOVQ AX, CX
103 MOVQ $1360296554856532783, AX
104 MULQ CX
105 ADDQ CX, DX
106 RCRQ $1, DX
107 SHRQ $29, DX
108 MOVQ DX, sec+8(FP)
109 IMULQ $1000000000, DX
110 SUBQ DX, CX
111 MOVL CX, nsec+16(FP)
112 RET
113
114TEXT runtime·notify(SB),NOSPLIT,$0
115 MOVQ $28, BP
116 SYSCALL
117 MOVL AX, ret+8(FP)
118 RET
119
120TEXT runtime·noted(SB),NOSPLIT,$0
121 MOVQ $29, BP
122 SYSCALL
123 MOVL AX, ret+8(FP)
124 RET
125
126TEXT runtime·plan9_semrelease(SB),NOSPLIT,$0
127 MOVQ $38, BP
128 SYSCALL
129 MOVL AX, ret+16(FP)
130 RET
131
132TEXT runtime·rfork(SB),NOSPLIT,$0
133 MOVQ $19, BP
134 SYSCALL
135 MOVL AX, ret+8(FP)
136 RET
137
138TEXT runtime·tstart_plan9(SB),NOSPLIT,$8
139 MOVQ newm+0(FP), CX
140 MOVQ m_g0(CX), DX
141
142 // Layout new m scheduler stack on os stack.
143 MOVQ SP, AX
144 MOVQ AX, (g_stack+stack_hi)(DX)
145 SUBQ $(64*1024), AX // stack size
146 MOVQ AX, (g_stack+stack_lo)(DX)
147 MOVQ AX, g_stackguard0(DX)
148 MOVQ AX, g_stackguard1(DX)
149
150 // Initialize procid from TOS struct.
151 MOVQ _tos(SB), AX
152 MOVL 64(AX), AX
153 MOVQ AX, m_procid(CX) // save pid as m->procid
154
155 // Finally, initialize g.
156 get_tls(BX)
157 MOVQ DX, g(BX)
158
159 CALL runtime·stackcheck(SB) // smashes AX, CX
160 CALL runtime·mstart(SB)
161
162 // Exit the thread.
163 MOVQ $0, 0(SP)
164 CALL runtime·exits(SB)
165 JMP 0(PC)
166
167// This is needed by asm_amd64.s
168TEXT runtime·settls(SB),NOSPLIT,$0
169 RET
170
171// void sigtramp(void *ureg, int8 *note)
172TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
173 get_tls(AX)
174
175 // check that g exists
176 MOVQ g(AX), BX
177 CMPQ BX, $0
178 JNE 3(PC)
179 CALL runtime·badsignal2(SB) // will exit
180 RET
181
182 // save args
183 MOVQ ureg+0(FP), CX
184 MOVQ note+8(FP), DX
185
186 // change stack
187 MOVQ g_m(BX), BX
188 MOVQ m_gsignal(BX), R10
189 MOVQ (g_stack+stack_hi)(R10), BP
190 MOVQ BP, SP
191
192 // make room for args and g
193 SUBQ $128, SP
194
195 // save g
196 MOVQ g(AX), BP
197 MOVQ BP, 32(SP)
198
199 // g = m->gsignal
200 MOVQ R10, g(AX)
201
202 // load args and call sighandler
203 MOVQ CX, 0(SP)
204 MOVQ DX, 8(SP)
205 MOVQ BP, 16(SP)
206
207 CALL runtime·sighandler(SB)
208 MOVL 24(SP), AX
209
210 // restore g
211 get_tls(BX)
212 MOVQ 32(SP), R10
213 MOVQ R10, g(BX)
214
215 // call noted(AX)
216 MOVQ AX, 0(SP)
217 CALL runtime·noted(SB)
218 RET
219
220TEXT runtime·setfpmasks(SB),NOSPLIT,$8
221 STMXCSR 0(SP)
222 MOVL 0(SP), AX
223 ANDL $~0x3F, AX
224 ORL $(0x3F<<7), AX
225 MOVL AX, 0(SP)
226 LDMXCSR 0(SP)
227 RET
228
229#define ERRMAX 128 /* from os_plan9.h */
230
231// void errstr(int8 *buf, int32 len)
232TEXT errstr<>(SB),NOSPLIT,$0
233 MOVQ $41, BP
234 SYSCALL
235 RET
236
237// func errstr() string
238// Only used by package syscall.
239// Grab error string due to a syscall made
240// in entersyscall mode, without going
241// through the allocator (issue 4994).
242// See ../syscall/asm_plan9_amd64.s:/·Syscall/
243TEXT runtime·errstr(SB),NOSPLIT,$16-16
244 get_tls(AX)
245 MOVQ g(AX), BX
246 MOVQ g_m(BX), BX
247 MOVQ (m_mOS+mOS_errstr)(BX), CX
248 MOVQ CX, 0(SP)
249 MOVQ $ERRMAX, 8(SP)
250 CALL errstr<>(SB)
251 CALL runtime·findnull(SB)
252 MOVQ 8(SP), AX
253 MOVQ AX, ret_len+8(FP)
254 MOVQ 0(SP), AX
255 MOVQ AX, ret_base+0(FP)
256 RET
257
258// never called on this platform
259TEXT ·sigpanictramp(SB),NOSPLIT,$0-0
260 UNDEF
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