asmacros.h (90e35b0a987f8e61ea5682b951c771b6f9dd5b63) asmacros.h (aa3ea612be3659881392251e91912682b038ce78)
1/* -*- mode: asm -*- */
2/*-
3 * SPDX-License-Identifier: BSD-3-Clause
4 *
5 * Copyright (c) 1993 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Copyright (c) 2018 The FreeBSD Foundation

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50 * CNAME is used to manage the relationship between symbol names in C
51 * and the equivalent assembly language names. CNAME is given a name as
52 * it would be used in a C program. It expands to the equivalent assembly
53 * language name.
54 */
55#define CNAME(csym) csym
56
57#define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
1/* -*- mode: asm -*- */
2/*-
3 * SPDX-License-Identifier: BSD-3-Clause
4 *
5 * Copyright (c) 1993 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Copyright (c) 2018 The FreeBSD Foundation

--- 41 unchanged lines hidden (view full) ---

50 * CNAME is used to manage the relationship between symbol names in C
51 * and the equivalent assembly language names. CNAME is given a name as
52 * it would be used in a C program. It expands to the equivalent assembly
53 * language name.
54 */
55#define CNAME(csym) csym
56
57#define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
58#ifdef GPROF
59#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
58#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
60#else
61#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
62#endif
63#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
64
65#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
66 .type CNAME(name),@function; CNAME(name):
59#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
60
61#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
62 .type CNAME(name),@function; CNAME(name):
67#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
68#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
69
63#define ENTRY(name) GEN_ENTRY(name)
64#define ALTENTRY(name) GEN_ENTRY(name)
70#define END(name) .size name, . - name
71
65#define END(name) .size name, . - name
66
72#ifdef GPROF
73/*
67/*
74 * __mcount is like [.]mcount except that doesn't require its caller to set
75 * up a frame pointer. It must be called before pushing anything onto the
76 * stack. gcc should eventually generate code to call __mcount in most
77 * cases. This would make -pg in combination with -fomit-frame-pointer
78 * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
79 * allow profiling before setting up the frame pointer, but this is
80 * inadequate for good handling of special cases, e.g., -fpic works best
81 * with profiling after the prologue.
82 *
83 * [.]mexitcount is a new function to support non-statistical profiling if an
84 * accurate clock is available. For C sources, calls to it are generated
85 * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
86 * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
87 * but gcc currently generates calls to it at the start of the epilogue to
88 * avoid problems with -fpic.
89 *
90 * [.]mcount and __mcount may clobber the call-used registers and %ef.
91 * [.]mexitcount may clobber %ecx and %ef.
92 *
93 * Cross-jumping makes non-statistical profiling timing more complicated.
94 * It is handled in many cases by calling [.]mexitcount before jumping. It
95 * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
96 * It is handled for some fault-handling jumps by not sharing the exit
97 * routine.
98 *
99 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
100 * the main entry point. Note that alt entries are counted twice. They
101 * have to be counted as ordinary entries for gprof to get the call times
102 * right for the ordinary entries.
103 *
104 * High local labels are used in macros to avoid clashes with local labels
105 * in functions.
106 *
107 * Ordinary `ret' is used instead of a macro `RET' because there are a lot
108 * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
109 * be used because this file is sometimes preprocessed in traditional mode).
110 * `ret' clobbers eflags but this doesn't matter.
111 */
112#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
113#define CROSSJUMP(jtrue, label, jfalse) \
114 jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
115#define CROSSJUMPTARGET(label) \
116 ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
117#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
118#define FAKE_MCOUNT(caller) pushq caller ; call __mcount ; popq %rcx
119#define MCOUNT call __mcount
120#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
121#ifdef GUPROF
122#define MEXITCOUNT call .mexitcount
123#define ret MEXITCOUNT ; NON_GPROF_RET
124#else
125#define MEXITCOUNT
126#endif
127
128#else /* !GPROF */
129/*
130 * ALTENTRY() has to align because it is before a corresponding ENTRY().
131 * ENTRY() has to align to because there may be no ALTENTRY() before it.
132 * If there is a previous ALTENTRY() then the alignment code for ENTRY()
133 * is empty.
134 */
135#define ALTENTRY(name) GEN_ENTRY(name)
136#define CROSSJUMP(jtrue, label, jfalse) jtrue label
137#define CROSSJUMPTARGET(label)
138#define ENTRY(name) GEN_ENTRY(name)
139#define FAKE_MCOUNT(caller)
140#define MCOUNT
141#define MCOUNT_LABEL(name)
142#define MEXITCOUNT
143#endif /* GPROF */
144
145/*
146 * Convenience for adding frame pointers to hand-coded ASM. Useful for
147 * DTrace, HWPMC, and KDB.
148 */
149#define PUSH_FRAME_POINTER \
150 pushq %rbp ; \
151 movq %rsp, %rbp ;
152#define POP_FRAME_POINTER \
153 popq %rbp

--- 169 unchanged lines hidden --- 		68 * Convenience for adding frame pointers to hand-coded ASM. Useful for
69 * DTrace, HWPMC, and KDB.
70 */
71#define PUSH_FRAME_POINTER \
72 pushq %rbp ; \
73 movq %rsp, %rbp ;
74#define POP_FRAME_POINTER \
75 popq %rbp

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