diff options
Diffstat (limited to 'sys/amd64/include/asmacros.h')
| -rw-r--r-- | sys/amd64/include/asmacros.h | 82 |
1 files changed, 2 insertions, 80 deletions
diff --git a/sys/amd64/include/asmacros.h b/sys/amd64/include/asmacros.h index b8541bed310c..438f4ec26f61 100644 --- a/sys/amd64/include/asmacros.h +++ b/sys/amd64/include/asmacros.h @@ -55,92 +55,14 @@ #define CNAME(csym) csym #define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */ -#ifdef GPROF #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ -#else -#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ -#endif #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ #define GEN_ENTRY(name) ALIGN_TEXT; .globl 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) pushq caller ; call __mcount ; popq %rcx -#define MCOUNT call __mcount -#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT -#ifdef GUPROF -#define MEXITCOUNT call .mexitcount -#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 FAKE_MCOUNT(caller) -#define MCOUNT -#define MCOUNT_LABEL(name) -#define MEXITCOUNT -#endif /* GPROF */ +#define ALTENTRY(name) GEN_ENTRY(name) +#define END(name) .size name, . - name /* * Convenience for adding frame pointers to hand-coded ASM. Useful for |