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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
24: */
25:
26: #include <mach_kdb.h>
27: #include <mach_kgdb.h>
28: #include <mach_debug.h>
29: #include <assym.s>
30: #include <ppc/asm.h>
31: #include <ppc/proc_reg.h>
32: #include <mach/ppc/vm_param.h>
33:
34: /*
35: * vm_offset_t getrpc(void) - Return address of the function
36: * that called the current function
37: */
38:
39: /* By using this function, we force the caller to save its LR in a known
40: * location, which we can pick up and return. See PowerPC ELF specs.
41: */
42: ENTRY(getrpc, TAG_NO_FRAME_USED)
43: lwz ARG0, FM_BACKPTR(r1) /* Load our backchain ptr */
44: lwz ARG0, FM_LR_SAVE(ARG0) /* Load previously saved LR */
45: blr /* And return */
46:
47:
48: /* Mask and unmask interrupts at the processor level */
49: ENTRY(interrupt_disable, TAG_NO_FRAME_USED)
50: mfmsr r0
51: rlwinm r0, r0, 0, MSR_EE_BIT+1, MSR_EE_BIT-1
52: mtmsr r0
53: blr
54:
55: ENTRY(interrupt_enable, TAG_NO_FRAME_USED)
56:
57: mfmsr r0
58: ori r0, r0, MASK(MSR_EE)
59: mtmsr r0
60: blr
61:
62: #if MACH_KDB
63: /*
64: * Kernel debugger versions of the spl*() functions. This allows breakpoints
65: * in the spl*() functions.
66: */
67:
68: /* Mask and unmask interrupts at the processor level */
69: ENTRY(db_interrupt_disable, TAG_NO_FRAME_USED)
70: mfmsr r0
71: rlwinm r0, r0, 0, MSR_EE_BIT+1, MSR_EE_BIT-1
72: mtmsr r0
73: blr
74:
75: ENTRY(db_interrupt_enable, TAG_NO_FRAME_USED)
76: mfmsr r0
77: ori r0, r0, MASK(MSR_EE)
78: mtmsr r0
79: blr
80: #endif /* MACH_KDB */
81:
82: /*
83: * General entry for all debuggers. This gets us onto the debug stack and
84: * then back off at exit. We need to pass back R3 to caller.
85: */
86:
87: ENTRY(Call_Debugger, TAG_NO_FRAME_USED)
88:
89: mfmsr r7 ; Get the current MSR
90: mflr r0 ; Save the return
91: rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions
92: mtmsr r7 ; Do it
93: mfsprg r8,0 ; Get the per_proc block
94: stw r0,FM_LR_SAVE(r1) ; Save return on current stack
95:
96: lwz r9,PP_DEBSTACKPTR(r8) ; Get the debug stack
97: cmpwi r9,0 ; Are we already on it?
98: bne cdNewDeb ; No...
99:
100: mr r9,r1 ; We are already on the stack, so use the current value
101: subi r9,r9,FM_REDZONE+FM_SIZE ; Carve some extra space here
102:
103: cdNewDeb: li r0,0 ; Clear this out
104: stw r1,FM_ARG0(r9) ; Save the old stack pointer as if it were the first arg
105:
106: stw r0,PP_DEBSTACKPTR(r8) ; Mark debug stack as busy
107:
108: subi r1,r9,FM_SIZE ; Carve a new frame
109: stw r0,FM_BACKPTR(r1) ; Chain back
110:
111: bl EXT(Call_DebuggerC) ; Call the "C" phase of this
112:
113: mfmsr r0 ; Get the MSR just in case it was enabled
114: addi r1,r1,FM_SIZE ; Pop off first stack frame
115: rlwinm r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions enable bit
116: mtmsr r0
117:
118: mfsprg r8,0 ; Get the per_proc block address
119:
120: lwz r9,PP_DEBSTACK_TOP_SS(r8) ; Get the top of the stack
121: cmplw r1,r9 ; Have we hit the bottom of the debug stack?
122: lwz r1,FM_ARG0(r1) ; Get previous stack frame
123: lwz r0,FM_LR_SAVE(r1) ; Get return address
124: mtlr r0 ; Set the return point
125: bnelr ; Return if still on debug stack
126:
127: stw r9,PP_DEBSTACKPTR(r8) ; Mark debug stack as free
128: blr
129:
130:
131: /* The following routines are for C-support. They are usually
132: * inlined into the C using the specifications in proc_reg.h,
133: * but if optimisation is switched off, the inlining doesn't work
134: */
135:
136: ENTRY(get_got, TAG_NO_FRAME_USED)
137: mr ARG0, r2
138: blr
139:
140: ENTRY(mflr, TAG_NO_FRAME_USED)
141: mflr ARG0
142: blr
143:
144: ENTRY(mfpvr, TAG_NO_FRAME_USED)
145: mfpvr ARG0
146: blr
147:
148: ENTRY(mtmsr, TAG_NO_FRAME_USED)
149: mtmsr ARG0
150: isync
151: blr
152:
153: ENTRY(mfmsr, TAG_NO_FRAME_USED)
154: mfmsr ARG0
155: blr
156:
157: ENTRY(mtsrin, TAG_NO_FRAME_USED)
158: isync
159: mtsrin ARG0, ARG1
160: isync
161: blr
162:
163: ENTRY(mfsrin, TAG_NO_FRAME_USED)
164: mfsrin ARG0, ARG0
165: blr
166:
167: ENTRY(mtsdr1, TAG_NO_FRAME_USED)
168: mtsdr1 ARG0
169: blr
170:
171: ENTRY(mtdar, TAG_NO_FRAME_USED)
172: mtdar ARG0
173: blr
174:
175: ENTRY(mfdar, TAG_NO_FRAME_USED)
176: mfdar ARG0
177: blr
178:
179: ENTRY(mtdec, TAG_NO_FRAME_USED)
180: mtdec ARG0
181: blr
182:
183: /* Decrementer frequency and realtime|timebase processor registers
184: * are different between ppc601 and ppc603/4, we define them all.
185: */
186:
187: ENTRY(isync_mfdec, TAG_NO_FRAME_USED)
188: isync
189: mfdec ARG0
190: blr
191:
192:
193: ENTRY(mftb, TAG_NO_FRAME_USED)
194: mftb ARG0
195: blr
196:
197: ENTRY(mftbu, TAG_NO_FRAME_USED)
198: mftbu ARG0
199: blr
200:
201: ENTRY(mfrtcl, TAG_NO_FRAME_USED)
202: mfspr ARG0, 5
203: blr
204:
205: ENTRY(mfrtcu, TAG_NO_FRAME_USED)
206: mfspr ARG0, 4
207: blr
208:
209: ENTRY(tlbie, TAG_NO_FRAME_USED)
210: tlbie ARG0
211: blr
212:
213:
214: /*
215: * Performance Monitor Register Support
216: */
217:
218: ENTRY(mfmmcr0, TAG_NO_FRAME_USED)
219: mfspr r3,mmcr0
220: blr
221:
222: ENTRY(mtmmcr0, TAG_NO_FRAME_USED)
223: mtspr mmcr0,r3
224: blr
225:
226: ENTRY(mfmmcr1, TAG_NO_FRAME_USED)
227: mfspr r3,mmcr1
228: blr
229:
230: ENTRY(mtmmcr1, TAG_NO_FRAME_USED)
231: mtspr mmcr1,r3
232: blr
233:
234: ENTRY(mfmmcr2, TAG_NO_FRAME_USED)
235: mfspr r3,mmcr2
236: blr
237:
238: ENTRY(mtmmcr2, TAG_NO_FRAME_USED)
239: mtspr mmcr2,r3
240: blr
241:
242: ENTRY(mfpmc1, TAG_NO_FRAME_USED)
243: mfspr r3,pmc1
244: blr
245:
246: ENTRY(mtpmc1, TAG_NO_FRAME_USED)
247: mtspr pmc1,r3
248: blr
249:
250: ENTRY(mfpmc2, TAG_NO_FRAME_USED)
251: mfspr r3,pmc2
252: blr
253:
254: ENTRY(mtpmc2, TAG_NO_FRAME_USED)
255: mtspr pmc2,r3
256: blr
257:
258: ENTRY(mfpmc3, TAG_NO_FRAME_USED)
259: mfspr r3,pmc3
260: blr
261:
262: ENTRY(mtpmc3, TAG_NO_FRAME_USED)
263: mtspr pmc3,r3
264: blr
265:
266: ENTRY(mfpmc4, TAG_NO_FRAME_USED)
267: mfspr r3,pmc4
268: blr
269:
270: ENTRY(mtpmc4, TAG_NO_FRAME_USED)
271: mtspr pmc4,r3
272: blr
273:
274: ENTRY(mfsia, TAG_NO_FRAME_USED)
275: mfspr r3,sia
276: blr
277:
278: ENTRY(mfsda, TAG_NO_FRAME_USED)
279: mfspr r3,sda
280: blr
281:
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