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sys/i386/include/asmacros.h
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* CNAME is used to manage the relationship between symbol names in C | * CNAME is used to manage the relationship between symbol names in C | ||||
* and the equivalent assembly language names. CNAME is given a name as | * and the equivalent assembly language names. CNAME is given a name as | ||||
* it would be used in a C program. It expands to the equivalent assembly | * it would be used in a C program. It expands to the equivalent assembly | ||||
* language name. | * language name. | ||||
*/ | */ | ||||
#define CNAME(csym) csym | #define CNAME(csym) csym | ||||
#define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */ | #define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */ | ||||
#ifdef GPROF | |||||
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ | |||||
#else | |||||
#define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ | #define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ | ||||
#endif | |||||
#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ | #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ | ||||
#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ | #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ | ||||
.type CNAME(name),@function; CNAME(name): | .type CNAME(name),@function; CNAME(name): | ||||
#define NON_GPROF_ENTRY(name) GEN_ENTRY(name) | |||||
#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */ | |||||
#define END(name) .size name, . - name | |||||
#ifdef GPROF | |||||
/* | |||||
* __mcount is like [.]mcount except that doesn't require its caller to set | |||||
* up a frame pointer. It must be called before pushing anything onto the | |||||
* stack. gcc should eventually generate code to call __mcount in most | |||||
* cases. This would make -pg in combination with -fomit-frame-pointer | |||||
* useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to | |||||
* allow profiling before setting up the frame pointer, but this is | |||||
* inadequate for good handling of special cases, e.g., -fpic works best | |||||
* with profiling after the prologue. | |||||
* | |||||
* [.]mexitcount is a new function to support non-statistical profiling if an | |||||
* accurate clock is available. For C sources, calls to it are generated | |||||
* by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to | |||||
* call [.]mexitcount at the end of a function like the MEXITCOUNT macro does, | |||||
* but gcc currently generates calls to it at the start of the epilogue to | |||||
* avoid problems with -fpic. | |||||
* | |||||
* [.]mcount and __mcount may clobber the call-used registers and %ef. | |||||
* [.]mexitcount may clobber %ecx and %ef. | |||||
* | |||||
* Cross-jumping makes non-statistical profiling timing more complicated. | |||||
* It is handled in many cases by calling [.]mexitcount before jumping. It | |||||
* is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL(). | |||||
* It is handled for some fault-handling jumps by not sharing the exit | |||||
* routine. | |||||
* | |||||
* ALTENTRY() must be before a corresponding ENTRY() so that it can jump to | |||||
* the main entry point. Note that alt entries are counted twice. They | |||||
* have to be counted as ordinary entries for gprof to get the call times | |||||
* right for the ordinary entries. | |||||
* | |||||
* High local labels are used in macros to avoid clashes with local labels | |||||
* in functions. | |||||
* | |||||
* Ordinary `ret' is used instead of a macro `RET' because there are a lot | |||||
* of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't | |||||
* be used because this file is sometimes preprocessed in traditional mode). | |||||
* `ret' clobbers eflags but this doesn't matter. | |||||
*/ | |||||
#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f | |||||
#define CROSSJUMP(jtrue, label, jfalse) \ | |||||
jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8: | |||||
#define CROSSJUMPTARGET(label) \ | |||||
ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label | |||||
#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT | |||||
#define FAKE_MCOUNT(caller) pushl caller ; call *__mcountp ; popl %ecx | |||||
#define MCOUNT call *__mcountp | |||||
#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT | |||||
#ifdef GUPROF | |||||
#define MEXITCOUNT call *__mexitcountp | |||||
#define ret MEXITCOUNT ; NON_GPROF_RET | |||||
#else | |||||
#define MEXITCOUNT | |||||
#endif | |||||
#else /* !GPROF */ | |||||
/* | |||||
* ALTENTRY() has to align because it is before a corresponding ENTRY(). | |||||
* ENTRY() has to align to because there may be no ALTENTRY() before it. | |||||
* If there is a previous ALTENTRY() then the alignment code for ENTRY() | |||||
* is empty. | |||||
*/ | |||||
#define ALTENTRY(name) GEN_ENTRY(name) | |||||
#define CROSSJUMP(jtrue, label, jfalse) jtrue label | |||||
#define CROSSJUMPTARGET(label) | |||||
#define ENTRY(name) GEN_ENTRY(name) | #define ENTRY(name) GEN_ENTRY(name) | ||||
#define FAKE_MCOUNT(caller) | #define ALTENTRY(name) GEN_ENTRY(name) | ||||
#define MCOUNT | #define END(name) .size name, . - name | ||||
#define MCOUNT_LABEL(name) | |||||
#define MEXITCOUNT | |||||
#endif /* GPROF */ | |||||
#ifdef LOCORE | #ifdef LOCORE | ||||
#define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ | #define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ | ||||
#define SEL_RPL_MASK 0x0003 | #define SEL_RPL_MASK 0x0003 | ||||
/* | /* | ||||
* Convenience macro for declaring interrupt entry points. | * Convenience macro for declaring interrupt entry points. | ||||
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