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Added macros CROSSJUMP(), CROSSJUMP_LABEL() and GPROF_RET. These will
be used to fix some benign(?) bugs in GUPROF profiling. Fixed stale comments and long lines.
This commit is contained in:
Bruce Evans
parent
336cf5014e
commit
435929a84b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=18961
@ -30,7 +30,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: asmacros.h,v 1.7 1996/03/31 04:17:25 bde Exp $
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* $Id: asmacros.h,v 1.8 1996/05/31 01:08:05 peter Exp $
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*/
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#ifndef _MACHINE_ASMACROS_H_
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@ -39,14 +39,16 @@
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#ifdef KERNEL
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#include <sys/cdefs.h>
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/* XXX too much duplication in various asm*.h's and gprof.h's */
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/* XXX too much duplication in various asm*.h's. */
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#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment (better for 486), nop filled */
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); __CONCAT(_,name):
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); \
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__CONCAT(_,name):
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#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
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#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
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#ifdef GPROF
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/*
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@ -59,26 +61,21 @@
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* inadequate for good handling of special cases, e.g., -fpic works best
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* with profiling after the prologue.
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*
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* Neither __mcount nor mcount requires %eax to point to 4 bytes of data,
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* so don't waste space allocating the data or time setting it up. Changes
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* to avoid the wastage in gcc-2.4.5-compiled code are available.
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*
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* mexitcount is a new profiling feature to allow accurate timing of all
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* functions if an accurate clock is available. Changes to gcc-2.4.5 to
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* support it are are available. The changes currently don't allow not
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* generating mexitcounts for non-kernel code. It is best to call
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* mexitcount right at the end of a function like the MEXITCOUNT macro
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* does, but the changes to gcc only implement calling it as the first
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* thing in the epilogue to avoid problems with -fpic.
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* mexitcount is a new function to support non-statistical profiling if an
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* accurate clock is available. For C sources, calls to it are generated
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* by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
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* call mexitcount at the end of a function like the MEXITCOUNT macro does,
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* but gcc currently generates calls to it at the start of the epilogue to
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* avoid problems with -fpic.
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*
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* mcount and __mexitcount may clobber the call-used registers and %ef.
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* mexitcount may clobber %ecx and %ef.
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*
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* Cross-jumping makes accurate timing more difficult. It is handled in
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* many cases by calling mexitcount before jumping. It is not handled
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* for some conditional jumps (e.g., in bcopyx) or for some fault-handling
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* jumps. It is handled for some fault-handling jumps by not sharing the
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* exit routine.
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* Cross-jumping makes non-statistical profiling timing more complicated.
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* It is handled in many cases by calling mexitcount before jumping. It is
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* handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
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* It is handled for some fault-handling jumps by not sharing the exit
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* routine.
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*
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* ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
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* the main entry point. Note that alt entries are counted twice. They
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@ -88,19 +85,24 @@
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* High local labels are used in macros to avoid clashes with local labels
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* in functions.
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*
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* "ret" is used instead of "RET" because there are a lot of "ret"s.
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* 0xc3 is the opcode for "ret" (#define ret ... ret fails because this
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* file is preprocessed in traditional mode). "ret" clobbers eflags
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* but this doesn't matter.
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* Ordinary `ret' is used instead of a macro `RET' because there are a lot
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* of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
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* be used because this file is sometimes preprocessed in traditional mode).
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* `ret' clobbers eflags but this doesn't matter.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
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#define CROSSJUMP(jtrue, label, jfalse) \
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jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
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#define CROSSJUMPTARGET(label) \
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ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
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#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
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#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx
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#define MCOUNT call __mcount
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#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
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#define MEXITCOUNT call mexitcount
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#define ret MEXITCOUNT ; .byte 0xc3
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#else /* not GPROF */
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#define ret MEXITCOUNT ; NON_GPROF_RET
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#else /* !GPROF */
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/*
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* ALTENTRY() has to align because it is before a corresponding ENTRY().
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* ENTRY() has to align to because there may be no ALTENTRY() before it.
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@ -108,6 +110,8 @@
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* is empty.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name)
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#define CROSSJUMP(jtrue, label, jfalse) jtrue label
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#define CROSSJUMPTARGET(label)
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#define ENTRY(name) GEN_ENTRY(name)
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#define FAKE_MCOUNT(caller)
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#define MCOUNT
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@ -30,7 +30,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: asmacros.h,v 1.7 1996/03/31 04:17:25 bde Exp $
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* $Id: asmacros.h,v 1.8 1996/05/31 01:08:05 peter Exp $
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*/
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#ifndef _MACHINE_ASMACROS_H_
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@ -39,14 +39,16 @@
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#ifdef KERNEL
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#include <sys/cdefs.h>
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/* XXX too much duplication in various asm*.h's and gprof.h's */
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/* XXX too much duplication in various asm*.h's. */
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#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment (better for 486), nop filled */
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); __CONCAT(_,name):
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); \
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__CONCAT(_,name):
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#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
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#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
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#ifdef GPROF
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/*
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@ -59,26 +61,21 @@
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* inadequate for good handling of special cases, e.g., -fpic works best
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* with profiling after the prologue.
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*
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* Neither __mcount nor mcount requires %eax to point to 4 bytes of data,
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* so don't waste space allocating the data or time setting it up. Changes
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* to avoid the wastage in gcc-2.4.5-compiled code are available.
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*
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* mexitcount is a new profiling feature to allow accurate timing of all
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* functions if an accurate clock is available. Changes to gcc-2.4.5 to
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* support it are are available. The changes currently don't allow not
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* generating mexitcounts for non-kernel code. It is best to call
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* mexitcount right at the end of a function like the MEXITCOUNT macro
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* does, but the changes to gcc only implement calling it as the first
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* thing in the epilogue to avoid problems with -fpic.
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* mexitcount is a new function to support non-statistical profiling if an
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* accurate clock is available. For C sources, calls to it are generated
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* by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
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* call mexitcount at the end of a function like the MEXITCOUNT macro does,
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* but gcc currently generates calls to it at the start of the epilogue to
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* avoid problems with -fpic.
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*
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* mcount and __mexitcount may clobber the call-used registers and %ef.
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* mexitcount may clobber %ecx and %ef.
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*
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* Cross-jumping makes accurate timing more difficult. It is handled in
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* many cases by calling mexitcount before jumping. It is not handled
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* for some conditional jumps (e.g., in bcopyx) or for some fault-handling
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* jumps. It is handled for some fault-handling jumps by not sharing the
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* exit routine.
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* Cross-jumping makes non-statistical profiling timing more complicated.
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* It is handled in many cases by calling mexitcount before jumping. It is
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* handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
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* It is handled for some fault-handling jumps by not sharing the exit
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* routine.
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*
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* ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
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* the main entry point. Note that alt entries are counted twice. They
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@ -88,19 +85,24 @@
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* High local labels are used in macros to avoid clashes with local labels
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* in functions.
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*
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* "ret" is used instead of "RET" because there are a lot of "ret"s.
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* 0xc3 is the opcode for "ret" (#define ret ... ret fails because this
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* file is preprocessed in traditional mode). "ret" clobbers eflags
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* but this doesn't matter.
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* Ordinary `ret' is used instead of a macro `RET' because there are a lot
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* of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
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* be used because this file is sometimes preprocessed in traditional mode).
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* `ret' clobbers eflags but this doesn't matter.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
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#define CROSSJUMP(jtrue, label, jfalse) \
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jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
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#define CROSSJUMPTARGET(label) \
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ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
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#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
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#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx
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#define MCOUNT call __mcount
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#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
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#define MEXITCOUNT call mexitcount
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#define ret MEXITCOUNT ; .byte 0xc3
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#else /* not GPROF */
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#define ret MEXITCOUNT ; NON_GPROF_RET
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#else /* !GPROF */
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/*
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* ALTENTRY() has to align because it is before a corresponding ENTRY().
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* ENTRY() has to align to because there may be no ALTENTRY() before it.
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@ -108,6 +110,8 @@
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* is empty.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name)
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#define CROSSJUMP(jtrue, label, jfalse) jtrue label
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#define CROSSJUMPTARGET(label)
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#define ENTRY(name) GEN_ENTRY(name)
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#define FAKE_MCOUNT(caller)
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#define MCOUNT
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