1 /*-
2 * Copyright (c) 1993 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: src/sys/amd64/include/asmacros.h,v 1.33 2007/08/22 04:26:07 jkoshy Exp $
30 */
31
32 #ifndef _MACHINE_ASMACROS_H_
33 #define _MACHINE_ASMACROS_H_
34
35 #include <sys/cdefs.h>
36
37 /* XXX too much duplication in various asm*.h's. */
38
39 /*
40 * CNAME is used to manage the relationship between symbol names in C
41 * and the equivalent assembly language names. CNAME is given a name as
42 * it would be used in a C program. It expands to the equivalent assembly
43 * language name.
44 */
45 #define CNAME(csym) csym
46
47 #define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
48 #ifdef GPROF
49 #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
50 #else
51 #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
52 #endif
53 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
54
55 #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
56 .type CNAME(name),@function; CNAME(name):
57 #define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
58 #define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
59
60 #define END(name) .size name, . - name
61
62 #ifdef GPROF
63 /*
64 * __mcount is like [.]mcount except that doesn't require its caller to set
65 * up a frame pointer. It must be called before pushing anything onto the
66 * stack. gcc should eventually generate code to call __mcount in most
67 * cases. This would make -pg in combination with -fomit-frame-pointer
68 * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
69 * allow profiling before setting up the frame pointer, but this is
70 * inadequate for good handling of special cases, e.g., -fpic works best
71 * with profiling after the prologue.
72 *
73 * [.]mexitcount is a new function to support non-statistical profiling if an
74 * accurate clock is available. For C sources, calls to it are generated
75 * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
76 * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
77 * but gcc currently generates calls to it at the start of the epilogue to
78 * avoid problems with -fpic.
79 *
80 * [.]mcount and __mcount may clobber the call-used registers and %ef.
81 * [.]mexitcount may clobber %ecx and %ef.
82 *
83 * Cross-jumping makes non-statistical profiling timing more complicated.
84 * It is handled in many cases by calling [.]mexitcount before jumping. It
85 * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
86 * It is handled for some fault-handling jumps by not sharing the exit
87 * routine.
88 *
89 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
90 * the main entry point. Note that alt entries are counted twice. They
91 * have to be counted as ordinary entries for gprof to get the call times
92 * right for the ordinary entries.
93 *
94 * High local labels are used in macros to avoid clashes with local labels
95 * in functions.
96 *
97 * Ordinary `ret' is used instead of a macro `RET' because there are a lot
98 * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
99 * be used because this file is sometimes preprocessed in traditional mode).
100 * `ret' clobbers eflags but this doesn't matter.
101 */
102 #define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
103 #define CROSSJUMP(jtrue, label, jfalse) \
104 jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
105 #define CROSSJUMPTARGET(label) \
106 ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
107 #define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
108 #define FAKE_MCOUNT(caller) pushq caller ; call __mcount ; popq %rcx
109 #define MCOUNT call __mcount
110 #define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
111 #ifdef GUPROF
112 #define MEXITCOUNT call .mexitcount
113 #define ret MEXITCOUNT ; NON_GPROF_RET
114 #else
115 #define MEXITCOUNT
116 #endif
117
118 #else /* !GPROF */
119 /*
120 * ALTENTRY() has to align because it is before a corresponding ENTRY().
121 * ENTRY() has to align to because there may be no ALTENTRY() before it.
122 * If there is a previous ALTENTRY() then the alignment code for ENTRY()
123 * is empty.
124 */
125 #define ALTENTRY(name) GEN_ENTRY(name)
126 #define CROSSJUMP(jtrue, label, jfalse) jtrue label
127 #define CROSSJUMPTARGET(label)
128 #define ENTRY(name) GEN_ENTRY(name)
129 #define FAKE_MCOUNT(caller)
130 #define MCOUNT
131 #define MCOUNT_LABEL(name)
132 #define MEXITCOUNT
133 #endif /* GPROF */
134
135 #ifdef LOCORE
136 /*
137 * Convenience macro for declaring interrupt entry points.
138 */
139 #define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
140 .type __CONCAT(X,name),@function; __CONCAT(X,name):
141
142 /*
143 * Macros to create and destroy a trap frame.
144 */
145 #define PUSH_FRAME \
146 subq $TF_RIP,%rsp ; /* skip dummy tf_err and tf_trapno */ \
147 testb $SEL_RPL_MASK,TF_CS(%rsp) ; /* come from kernel? */ \
148 jz 1f ; /* Yes, dont swapgs again */ \
149 swapgs ; \
150 1: movq %rdi,TF_RDI(%rsp) ; \
151 movq %rsi,TF_RSI(%rsp) ; \
152 movq %rdx,TF_RDX(%rsp) ; \
153 movq %rcx,TF_RCX(%rsp) ; \
154 movq %r8,TF_R8(%rsp) ; \
155 movq %r9,TF_R9(%rsp) ; \
156 movq %rax,TF_RAX(%rsp) ; \
157 movq %rbx,TF_RBX(%rsp) ; \
158 movq %rbp,TF_RBP(%rsp) ; \
159 movq %r10,TF_R10(%rsp) ; \
160 movq %r11,TF_R11(%rsp) ; \
161 movq %r12,TF_R12(%rsp) ; \
162 movq %r13,TF_R13(%rsp) ; \
163 movq %r14,TF_R14(%rsp) ; \
164 movq %r15,TF_R15(%rsp)
165
166 #define POP_FRAME \
167 movq TF_RDI(%rsp),%rdi ; \
168 movq TF_RSI(%rsp),%rsi ; \
169 movq TF_RDX(%rsp),%rdx ; \
170 movq TF_RCX(%rsp),%rcx ; \
171 movq TF_R8(%rsp),%r8 ; \
172 movq TF_R9(%rsp),%r9 ; \
173 movq TF_RAX(%rsp),%rax ; \
174 movq TF_RBX(%rsp),%rbx ; \
175 movq TF_RBP(%rsp),%rbp ; \
176 movq TF_R10(%rsp),%r10 ; \
177 movq TF_R11(%rsp),%r11 ; \
178 movq TF_R12(%rsp),%r12 ; \
179 movq TF_R13(%rsp),%r13 ; \
180 movq TF_R14(%rsp),%r14 ; \
181 movq TF_R15(%rsp),%r15 ; \
182 testb $SEL_RPL_MASK,TF_CS(%rsp) ; /* come from kernel? */ \
183 jz 1f ; /* keep kernel GS.base */ \
184 cli ; \
185 swapgs ; \
186 1: addq $TF_RIP,%rsp /* skip over tf_err, tf_trapno */
187
188 /*
189 * Access per-CPU data.
190 */
191 #define PCPU(member) %gs:PC_ ## member
192 #define PCPU_ADDR(member, reg) \
193 movq %gs:PC_PRVSPACE, reg ; \
194 addq $PC_ ## member, reg
195
196 #endif /* LOCORE */
197
198 #endif /* !_MACHINE_ASMACROS_H_ */
199 Cache object: b989a14433bc0605db78e0c4f9bc8d5c
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