1 /* $NetBSD: frame.h,v 1.6 2003/10/05 19:44:58 matt Exp $ */
4 * Copyright (c) 1994-1997 Mark Brinicombe.
5 * Copyright (c) 1994 Brini.
8 * This code is derived from software written for Brini by Mark Brinicombe
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Brini.
21 * 4. The name of the company nor the name of the author may be used to
22 * endorse or promote products derived from this software without specific
23 * prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #ifndef _MACHINE_ASMACROS_H_
41 #define _MACHINE_ASMACROS_H_
48 * ASM macros for pushing and pulling trapframes from the stack
50 * These macros are used to handle the irqframe and trapframe structures
55 * PUSHFRAME - macro to push a trap frame on the stack in the current mode
56 * Since the current mode is used, the SVC lr field is not defined.
58 * NOTE: r13 and r14 are stored separately as a work around for the
59 * SA110 rev 2 STM^ bug
63 str lr, [sp, #-4]!; /* Push the return address */ \
64 sub sp, sp, #(4*17); /* Adjust the stack pointer */ \
65 stmia sp, {r0-r12}; /* Push the user mode registers */ \
66 add r0, sp, #(4*13); /* Adjust the stack pointer */ \
67 stmia r0, {r13-r14}^; /* Push the user mode registers */ \
68 mov r0, r0; /* NOP for previous instruction */ \
69 mrs r0, spsr_all; /* Put the SPSR on the stack */ \
71 ldr r0, =ARM_RAS_START; \
74 mov r1, #0xffffffff; \
78 * PULLFRAME - macro to pull a trap frame from the stack in the current mode
79 * Since the current mode is used, the SVC lr field is ignored.
83 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \
85 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \
86 mov r0, r0; /* NOP for previous instruction */ \
87 add sp, sp, #(4*17); /* Adjust the stack pointer */ \
88 ldr lr, [sp], #0x0004; /* Pull the return address */
91 * PUSHFRAMEINSVC - macro to push a trap frame on the stack in SVC32 mode
92 * This should only be used if the processor is not currently in SVC32
93 * mode. The processor mode is switched to SVC mode and the trap frame is
94 * stored. The SVC lr field is used to store the previous value of
97 * NOTE: r13 and r14 are stored separately as a work around for the
98 * SA110 rev 2 STM^ bug
101 #define PUSHFRAMEINSVC \
102 stmdb sp, {r0-r3}; /* Save 4 registers */ \
103 mov r0, lr; /* Save xxx32 r14 */ \
104 mov r1, sp; /* Save xxx32 sp */ \
105 mrs r3, spsr; /* Save xxx32 spsr */ \
106 mrs r2, cpsr; /* Get the CPSR */ \
107 bic r2, r2, #(PSR_MODE); /* Fix for SVC mode */ \
108 orr r2, r2, #(PSR_SVC32_MODE); \
109 msr cpsr_c, r2; /* Punch into SVC mode */ \
110 mov r2, sp; /* Save SVC sp */ \
111 str r0, [sp, #-4]!; /* Push return address */ \
112 str lr, [sp, #-4]!; /* Push SVC lr */ \
113 str r2, [sp, #-4]!; /* Push SVC sp */ \
114 msr spsr_all, r3; /* Restore correct spsr */ \
115 ldmdb r1, {r0-r3}; /* Restore 4 regs from xxx mode */ \
116 sub sp, sp, #(4*15); /* Adjust the stack pointer */ \
117 stmia sp, {r0-r12}; /* Push the user mode registers */ \
118 add r0, sp, #(4*13); /* Adjust the stack pointer */ \
119 stmia r0, {r13-r14}^; /* Push the user mode registers */ \
120 mov r0, r0; /* NOP for previous instruction */ \
121 ldr r5, =ARM_RAS_START; /* Check if there's any RAS */ \
122 ldr r4, [r5, #4]; /* reset it to point at the */ \
123 cmp r4, #0xffffffff; /* end of memory if necessary; */ \
124 movne r1, #0xffffffff; /* leave value in r4 for later */ \
125 strne r1, [r5, #4]; /* comparision against PC. */ \
126 ldr r3, [r5]; /* Retrieve global RAS_START */ \
127 cmp r3, #0; /* and reset it if non-zero. */ \
128 movne r1, #0; /* If non-zero RAS_START and */ \
129 strne r1, [r5]; /* PC was lower than RAS_END, */ \
130 ldrne r1, [r0, #16]; /* adjust the saved PC so that */ \
131 cmpne r4, r1; /* execution later resumes at */ \
132 strhi r3, [r0, #16]; /* the RAS_START location. */ \
137 * PULLFRAMEFROMSVCANDEXIT - macro to pull a trap frame from the stack
138 * in SVC32 mode and restore the saved processor mode and PC.
139 * This should be used when the SVC lr register needs to be restored on
143 #define PULLFRAMEFROMSVCANDEXIT \
144 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \
145 msr spsr_all, r0; /* restore SPSR */ \
146 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \
147 mov r0, r0; /* NOP for previous instruction */ \
148 add sp, sp, #(4*15); /* Adjust the stack pointer */ \
149 ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */
155 .type name, %object ; \
162 ldr r0, [sp] /* Get the SPSR from stack */ ;\
163 mrs r4, cpsr /* save CPSR */ ;\
164 orr r1, r4, #(I32_bit|F32_bit) ;\
165 msr cpsr_c, r1 /* Disable interrupts */ ;\
166 and r0, r0, #(PSR_MODE) /* Returning to USR mode? */ ;\
167 teq r0, #(PSR_USR32_MODE) ;\
168 bne 2f /* Nope, get out now */ ;\
169 bic r4, r4, #(I32_bit|F32_bit) ;\
170 1: ldr r5, .Lcurthread ;\
172 ldr r1, [r5, #(TD_FLAGS)] ;\
173 and r1, r1, #(TDF_ASTPENDING|TDF_NEEDRESCHED) ;\
174 teq r1, #0x00000000 ;\
175 beq 2f /* Nope. Just bail */ ;\
176 msr cpsr_c, r4 /* Restore interrupts */ ;\
178 bl _C_LABEL(ast) /* ast(frame) */ ;\
179 orr r0, r4, #(I32_bit|F32_bit) ;\
185 #define AST_LOCALS ;\
187 .word _C_LABEL(__pcpu) + PC_CURTHREAD
193 #endif /* !_MACHINE_ASMACROS_H_ */