1 /* -*- mode: asm -*- */
3 * Copyright (c) 1993 The Regents of the University of California.
6 * Copyright (c) 2018 The FreeBSD Foundation
9 * Portions of this software were developed by
10 * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
11 * the FreeBSD Foundation.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR 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_
43 #include <sys/cdefs.h>
45 /* XXX too much duplication in various asm*.h's. */
48 * CNAME is used to manage the relationship between symbol names in C
49 * and the equivalent assembly language names. CNAME is given a name as
50 * it would be used in a C program. It expands to the equivalent assembly
53 #define CNAME(csym) csym
55 #define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
57 #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
59 #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
61 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
63 #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
64 .type CNAME(name),@function; CNAME(name):
65 #define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
66 #define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
68 #define END(name) .size name, . - name
72 * __mcount is like [.]mcount except that doesn't require its caller to set
73 * up a frame pointer. It must be called before pushing anything onto the
74 * stack. gcc should eventually generate code to call __mcount in most
75 * cases. This would make -pg in combination with -fomit-frame-pointer
76 * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
77 * allow profiling before setting up the frame pointer, but this is
78 * inadequate for good handling of special cases, e.g., -fpic works best
79 * with profiling after the prologue.
81 * [.]mexitcount is a new function to support non-statistical profiling if an
82 * accurate clock is available. For C sources, calls to it are generated
83 * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
84 * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
85 * but gcc currently generates calls to it at the start of the epilogue to
86 * avoid problems with -fpic.
88 * [.]mcount and __mcount may clobber the call-used registers and %ef.
89 * [.]mexitcount may clobber %ecx and %ef.
91 * Cross-jumping makes non-statistical profiling timing more complicated.
92 * It is handled in many cases by calling [.]mexitcount before jumping. It
93 * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
94 * It is handled for some fault-handling jumps by not sharing the exit
97 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
98 * the main entry point. Note that alt entries are counted twice. They
99 * have to be counted as ordinary entries for gprof to get the call times
100 * right for the ordinary entries.
102 * High local labels are used in macros to avoid clashes with local labels
105 * Ordinary `ret' is used instead of a macro `RET' because there are a lot
106 * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
107 * be used because this file is sometimes preprocessed in traditional mode).
108 * `ret' clobbers eflags but this doesn't matter.
110 #define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
111 #define CROSSJUMP(jtrue, label, jfalse) \
112 jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
113 #define CROSSJUMPTARGET(label) \
114 ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
115 #define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
116 #define FAKE_MCOUNT(caller) pushq caller ; call __mcount ; popq %rcx
117 #define MCOUNT call __mcount
118 #define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
120 #define MEXITCOUNT call .mexitcount
121 #define ret MEXITCOUNT ; NON_GPROF_RET
128 * ALTENTRY() has to align because it is before a corresponding ENTRY().
129 * ENTRY() has to align to because there may be no ALTENTRY() before it.
130 * If there is a previous ALTENTRY() then the alignment code for ENTRY()
133 #define ALTENTRY(name) GEN_ENTRY(name)
134 #define CROSSJUMP(jtrue, label, jfalse) jtrue label
135 #define CROSSJUMPTARGET(label)
136 #define ENTRY(name) GEN_ENTRY(name)
137 #define FAKE_MCOUNT(caller)
139 #define MCOUNT_LABEL(name)
144 * Convenience for adding frame pointers to hand-coded ASM. Useful for
145 * DTrace, HWPMC, and KDB.
147 #define PUSH_FRAME_POINTER \
150 #define POP_FRAME_POINTER \
155 * Access per-CPU data.
157 #define PCPU(member) %gs:PC_ ## member
158 #define PCPU_ADDR(member, reg) \
159 movq %gs:PC_PRVSPACE, reg ; \
160 addq $PC_ ## member, reg
163 * Convenience macro for declaring interrupt entry points.
165 #define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
166 .type __CONCAT(X,name),@function; __CONCAT(X,name):
175 .macro MOVE_STACKS qw
178 movq .L.offset(%rsp),%rdx
179 movq %rdx,.L.offset(%rax)
180 .L.offset=.L.offset+8
184 .macro PTI_UUENTRY has_err
189 MOVE_STACKS ((PTI_SIZE / 8) - 1 + \has_err)
195 .macro PTI_UENTRY has_err
202 .macro PTI_ENTRY name, cont, has_err=0
205 .type X\name\()_pti,@function
207 /* %rax, %rdx and possibly err not yet pushed */
208 testb $SEL_RPL_MASK,PTI_CS-(2+1-\has_err)*8(%rsp)
215 .macro PTI_INTRENTRY vec_name
217 .globl X\vec_name\()_pti
218 .type X\vec_name\()_pti,@function
220 testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* err, %rax, %rdx not pushed */
226 .macro INTR_PUSH_FRAME vec_name
229 .type X\vec_name,@function
231 testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* come from kernel? */
232 jz \vec_name\()_u /* Yes, dont swapgs again */
235 subq $TF_RIP,%rsp /* skip dummy tf_err and tf_trapno */
236 movq %rdi,TF_RDI(%rsp)
237 movq %rsi,TF_RSI(%rsp)
238 movq %rdx,TF_RDX(%rsp)
239 movq %rcx,TF_RCX(%rsp)
242 movq %rax,TF_RAX(%rsp)
243 movq %rbx,TF_RBX(%rsp)
244 movq %rbp,TF_RBP(%rsp)
245 movq %r10,TF_R10(%rsp)
246 movq %r11,TF_R11(%rsp)
247 movq %r12,TF_R12(%rsp)
248 movq %r13,TF_R13(%rsp)
249 movq %r14,TF_R14(%rsp)
250 movq %r15,TF_R15(%rsp)
252 movl $TF_HASSEGS,TF_FLAGS(%rsp)
254 testb $SEL_RPL_MASK,TF_CS(%rsp) /* come from kernel ? */
255 jz 1f /* yes, leave PCB_FULL_IRET alone */
256 movq PCPU(CURPCB),%r8
257 andl $~PCB_FULL_IRET,PCB_FLAGS(%r8)
261 .macro INTR_HANDLER vec_name
263 PTI_INTRENTRY \vec_name
264 INTR_PUSH_FRAME \vec_name
268 movq TF_RDI(%rsp),%rdi
269 movq TF_RSI(%rsp),%rsi
270 movq TF_RDX(%rsp),%rdx
271 movq TF_RCX(%rsp),%rcx
274 movq TF_RAX(%rsp),%rax
275 movq TF_RBX(%rsp),%rbx
276 movq TF_RBP(%rsp),%rbp
277 movq TF_R10(%rsp),%r10
278 movq TF_R11(%rsp),%r11
279 movq TF_R12(%rsp),%r12
280 movq TF_R13(%rsp),%r13
281 movq TF_R14(%rsp),%r14
282 movq TF_R15(%rsp),%r15
288 #define ELFNOTE(name, type, desctype, descdata...) \
289 .pushsection .note.name ; \
291 .long 2f - 1f /* namesz */ ; \
292 .long 4f - 3f /* descsz */ ; \
296 3:desctype descdata ; \
299 #else /* !__STDC__, i.e. -traditional */
300 #define ELFNOTE(name, type, desctype, descdata) \
301 .pushsection .note.name ; \
303 .long 2f - 1f /* namesz */ ; \
304 .long 4f - 3f /* descsz */ ; \
308 3:desctype descdata ; \
311 #endif /* __STDC__ */
313 #endif /* !_MACHINE_ASMACROS_H_ */