diff options
| -rw-r--r-- | libgcc/ChangeLog | 12 | ||||
| -rw-r--r-- | libgcc/config/gmon-sol2.c | 794 |
2 files changed, 363 insertions, 443 deletions
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 1a44c76f23c..7aa390477b9 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,5 +1,17 @@ 2011-06-01 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> + * config/gmon-sol2.c: Reindent. + Cleanup comments. + Remove, correct casts. + Use STDERR_FILENO, NULL. + (BASEADDRESS): Remove. + (minbrk): Remove. + (errno, sbrk): Remove declarations. + (monstartup) [hp300]: Remove. + (mcount): Remove. + +2011-06-01 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> + * Makefile.in (cpu_type): Define. * config.host (i[34567]86-*-rtems*): Handle it. (i[34567]86-*-solaris2*): Move body ... diff --git a/libgcc/config/gmon-sol2.c b/libgcc/config/gmon-sol2.c index 614a1126b1e..7d6149665d0 100644 --- a/libgcc/config/gmon-sol2.c +++ b/libgcc/config/gmon-sol2.c @@ -28,45 +28,27 @@ * SUCH DAMAGE. */ -/* FIXME: Check comment. */ -/* Mangled into a form that works on SPARC Solaris 2 by Mark Eichin +/* Mangled into a form that works on Solaris 2/SPARC by Mark Eichin * for Cygnus Support, July 1992. * - * This is a modified gmon.c by J.W.Hawtin <oolon@ankh.org>, - * 14/8/96 based on the original gmon.c in GCC and the hacked version - * solaris 2 sparc version (config/sparc/gmon-sol.c) by Mark Eichin. To do - * process profiling on solaris 2.X X86 + * Modified to support Solaris 2/x86 by J.W.Hawtin <oolon@ankh.org>, 14/8/96. * - * It must be used in conjunction with sol2-gc1.asm, which is used to start + * It must be used in conjunction with sol2-gc1.S, which is used to start * and stop process monitoring. - * - * Differences. - * - * On Solaris 2 _mcount is called by library functions not mcount, so support - * has been added for both. - * - * Also the prototype for profil() is different - * - * Solaris 2 does not seem to have char *minbrk whcih allows the setting of - * the minimum SBRK region so this code has been removed and lets pray malloc - * does not mess it up. - * - * Notes - * - * This code could easily be integrated with the original gmon.c and perhaps - * should be. */ + #include "tconfig.h" #include "tsystem.h" -#include <fcntl.h> /* for creat() */ +#include <fcntl.h> /* For creat. */ -#ifdef DEBUG -#include <stdio.h> -#endif - -static void moncontrol (int); extern void monstartup (char *, char *); extern void _mcleanup (void); +#ifdef __i386__ +static void internal_mcount (void) __attribute__ ((used)); +#else +static void internal_mcount (char *, unsigned short *) __attribute__ ((used)); +#endif +static void moncontrol (int); struct phdr { char *lpc; @@ -74,14 +56,11 @@ struct phdr { int ncnt; }; - -#define HISTFRACTION 2 -#define HISTCOUNTER unsigned short -#define HASHFRACTION 1 -#define ARCDENSITY 2 -#define MINARCS 50 -#define BASEADDRESS 0x8000000 /* On Solaris 2 X86 all executables start here - and not at 0 */ +#define HISTFRACTION 2 +#define HISTCOUNTER unsigned short +#define HASHFRACTION 1 +#define ARCDENSITY 2 +#define MINARCS 50 struct tostruct { char *selfpc; @@ -90,447 +69,376 @@ struct tostruct { }; struct rawarc { - unsigned long raw_frompc; - unsigned long raw_selfpc; - long raw_count; + unsigned long raw_frompc; + unsigned long raw_selfpc; + long raw_count; }; -#define ROUNDDOWN(x,y) (((x)/(y))*(y)) -#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y)) - -/* extern mcount() asm ("mcount"); */ -/*extern*/ char *minbrk /* asm ("minbrk") */; -typedef __SIZE_TYPE__ size_t; -typedef __PTRDIFF_TYPE__ intptr_t; - -extern int errno; - -extern void *sbrk (intptr_t); - - /* - * froms is actually a bunch of unsigned shorts indexing tos - */ -static int profiling = 3; -static unsigned short *froms; -static struct tostruct *tos = 0; -static long tolimit = 0; -static char *s_lowpc = 0; -static char *s_highpc = 0; -static size_t s_textsize = 0; - -static int ssiz; -static char *sbuf; -static int s_scale; - /* see profil(2) where this is describe (incorrectly) */ -#define SCALE_1_TO_1 0x10000L -#define MSG "No space for profiling buffer(s)\n" +#define ROUNDDOWN(x, y) (((x) / (y)) * (y)) +#define ROUNDUP(x, y) ((((x) + (y) - 1) / (y)) * (y)) -static void moncontrol (int); -extern void monstartup (char *, char *); -extern void _mcleanup (void); +/* froms is actually a bunch of unsigned shorts indexing tos. */ +static int profiling = 3; +static unsigned short *froms; +static struct tostruct *tos = NULL; +static long tolimit = 0; +static char *s_lowpc = NULL; +static char *s_highpc = NULL; +static size_t s_textsize = 0; -void monstartup(char *lowpc, char *highpc) +static int ssiz; +static char *sbuf; +static int s_scale; +/* See profil(2) where this is describe (incorrectly). */ +#define SCALE_1_TO_1 0x10000L + +#define MSG "No space for profiling buffer(s)\n" + +void +monstartup (char *lowpc, char *highpc) { - size_t monsize; - char *buffer; - register size_t o; - - /* - * round lowpc and highpc to multiples of the density we're using - * so the rest of the scaling (here and in gprof) stays in ints. - */ - lowpc = (char *) - ROUNDDOWN((size_t)lowpc, HISTFRACTION*sizeof(HISTCOUNTER)); - s_lowpc = lowpc; - highpc = (char *) - ROUNDUP((size_t)highpc, HISTFRACTION*sizeof(HISTCOUNTER)); - s_highpc = highpc; - s_textsize = highpc - lowpc; - monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr); - buffer = (char *) sbrk( monsize ); - if ( buffer == (char *) -1 ) { - write( 2 , MSG , sizeof(MSG) ); - return; - } - froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION ); - if ( froms == (unsigned short *) -1 ) { - write( 2 , MSG , sizeof(MSG) ); - froms = 0; - return; - } - tolimit = s_textsize * ARCDENSITY / 100; - if ( tolimit < MINARCS ) { - tolimit = MINARCS; - } else if ( tolimit > 65534 ) { - tolimit = 65534; - } - tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) ); - if ( tos == (struct tostruct *) -1 ) { - write( 2 , MSG , sizeof(MSG) ); - froms = 0; - tos = 0; - return; - } - minbrk = sbrk(0); - tos[0].link = 0; - sbuf = buffer; - ssiz = monsize; - ( (struct phdr *) buffer ) -> lpc = lowpc; - ( (struct phdr *) buffer ) -> hpc = highpc; - ( (struct phdr *) buffer ) -> ncnt = ssiz; - monsize -= sizeof(struct phdr); - if ( monsize <= 0 ) - return; - o = highpc - lowpc; - if( monsize < o ) -#ifndef hp300 - s_scale = ( (float) monsize / o ) * SCALE_1_TO_1; -#else /* avoid floating point */ - { - int quot = o / monsize; - - if (quot >= 0x10000) - s_scale = 1; - else if (quot >= 0x100) - s_scale = 0x10000 / quot; - else if (o >= 0x800000) - s_scale = 0x1000000 / (o / (monsize >> 8)); - else - s_scale = 0x1000000 / ((o << 8) / monsize); - } -#endif - else - s_scale = SCALE_1_TO_1; - moncontrol(1); + size_t monsize; + char *buffer; + size_t o; + + /* Round lowpc and highpc to multiples of the density we're using + so the rest of the scaling (here and in gprof) stays in ints. */ + lowpc = (char *) ROUNDDOWN ((size_t) lowpc, + HISTFRACTION * sizeof (HISTCOUNTER)); + s_lowpc = lowpc; + highpc = (char *) ROUNDUP ((size_t) highpc, + HISTFRACTION * sizeof (HISTCOUNTER)); + s_highpc = highpc; + s_textsize = highpc - lowpc; + monsize = (s_textsize / HISTFRACTION) + sizeof (struct phdr); + buffer = sbrk (monsize); + if (buffer == (void *) -1) { + write (STDERR_FILENO, MSG, sizeof (MSG)); + return; + } + froms = sbrk (s_textsize / HASHFRACTION); + if (froms == (void *) -1) { + write (STDERR_FILENO, MSG, sizeof (MSG)); + froms = NULL; + return; + } + tolimit = s_textsize * ARCDENSITY / 100; + if (tolimit < MINARCS) { + tolimit = MINARCS; + } else if (tolimit > 65534) { + tolimit = 65534; + } + tos = sbrk (tolimit * sizeof (struct tostruct)); + if (tos == (void *) -1) { + write (STDERR_FILENO, MSG, sizeof (MSG)); + froms = NULL; + tos = NULL; + return; + } + tos[0].link = 0; + sbuf = buffer; + ssiz = monsize; + ((struct phdr *) buffer)->lpc = lowpc; + ((struct phdr *) buffer)->hpc = highpc; + ((struct phdr *) buffer)->ncnt = ssiz; + monsize -= sizeof (struct phdr); + if (monsize <= 0) + return; + o = highpc - lowpc; + if(monsize < o) + s_scale = ((float) monsize / o) * SCALE_1_TO_1; + else + s_scale = SCALE_1_TO_1; + moncontrol (1); } void -_mcleanup(void) +_mcleanup (void) { - int fd; - int fromindex; - int endfrom; - char *frompc; - int toindex; - struct rawarc rawarc; - char *profdir; - const char *proffile; - char *progname; - char buf[PATH_MAX]; - extern char **___Argv; - - moncontrol(0); - - if ((profdir = getenv("PROFDIR")) != NULL) { - /* If PROFDIR contains a null value, no profiling output is produced */ - if (*profdir == '\0') { - return; - } - - progname=strrchr(___Argv[0], '/'); - if (progname == NULL) - progname=___Argv[0]; - else - progname++; - - sprintf(buf, "%s/%ld.%s", profdir, (long) getpid(), progname); - proffile = buf; - } else { - proffile = "gmon.out"; + int fd; + int fromindex; + int endfrom; + char *frompc; + int toindex; + struct rawarc rawarc; + char *profdir; + const char *proffile; + char *progname; + char buf[PATH_MAX]; + extern char **___Argv; + + moncontrol (0); + + if ((profdir = getenv ("PROFDIR")) != NULL) { + /* If PROFDIR contains a null value, no profiling output is produced. */ + if (*profdir == '\0') { + return; } - fd = creat( proffile, 0666 ); - if ( fd < 0 ) { - perror( proffile ); - return; + progname = strrchr (___Argv[0], '/'); + if (progname == NULL) + progname = ___Argv[0]; + else + progname++; + + sprintf (buf, "%s/%ld.%s", profdir, (long) getpid (), progname); + proffile = buf; + } else { + proffile = "gmon.out"; + } + + fd = creat (proffile, 0666); + if (fd < 0) { + perror (proffile); + return; + } +#ifdef DEBUG + fprintf (stderr, "[mcleanup] sbuf %#x ssiz %d\n", sbuf, ssiz); +#endif /* DEBUG */ + + write (fd, sbuf, ssiz); + endfrom = s_textsize / (HASHFRACTION * sizeof (*froms)); + for (fromindex = 0; fromindex < endfrom; fromindex++) { + if (froms[fromindex] == 0) { + continue; } -# ifdef DEBUG - fprintf( stderr , "[mcleanup] sbuf %#x ssiz %d\n" , sbuf , ssiz ); -# endif /* DEBUG */ - - write( fd , sbuf , ssiz ); - endfrom = s_textsize / (HASHFRACTION * sizeof(*froms)); - for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ ) { - if ( froms[fromindex] == 0 ) { - continue; - } - frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms)); - for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link) { -# ifdef DEBUG - fprintf( stderr , - "[mcleanup] frompc %#x selfpc %#x count %d\n" , - frompc , tos[toindex].selfpc , tos[toindex].count ); -# endif /* DEBUG */ - rawarc.raw_frompc = (unsigned long) frompc; - rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc; - rawarc.raw_count = tos[toindex].count; - write( fd , &rawarc , sizeof rawarc ); - } + frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof (*froms)); + for (toindex = froms[fromindex]; + toindex != 0; + toindex = tos[toindex].link) { +#ifdef DEBUG + fprintf (stderr, "[mcleanup] frompc %#x selfpc %#x count %d\n", + frompc, tos[toindex].selfpc, tos[toindex].count); +#endif /* DEBUG */ + rawarc.raw_frompc = (unsigned long) frompc; + rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc; + rawarc.raw_count = tos[toindex].count; + write (fd, &rawarc, sizeof (rawarc)); } - close( fd ); + } + close (fd); } -#ifdef __sparc__ -/* - * The SPARC stack frame is only held together by the frame pointers - * in the register windows. According to the SVR4 SPARC ABI - * Supplement, Low Level System Information/Operating System - * Interface/Software Trap Types, a type 3 trap will flush all of the - * register windows to the stack, which will make it possible to walk - * the frames and find the return addresses. - * However, it seems awfully expensive to incur a trap (system - * call) for every function call. It turns out that "call" simply puts - * the return address in %o7 expecting the "save" in the procedure to - * shift it into %i7; this means that before the "save" occurs, %o7 - * contains the address of the call to mcount, and %i7 still contains - * the caller above that. The asm mcount here simply saves those - * registers in argument registers and branches to internal_mcount, - * simulating a call with arguments. - * Kludges: - * 1) the branch to internal_mcount is hard coded; it should be - * possible to tell asm to use the assembler-name of a symbol. - * 2) in theory, the function calling mcount could have saved %i7 - * somewhere and reused the register; in practice, I *think* this will - * break longjmp (and maybe the debugger) but I'm not certain. (I take - * some comfort in the knowledge that it will break the native mcount - * as well.) - * 3) if builtin_return_address worked, this could be portable. - * However, it would really have to be optimized for arguments of 0 - * and 1 and do something like what we have here in order to avoid the - * trap per function call performance hit. - * 4) the atexit and monsetup calls prevent this from simply - * being a leaf routine that doesn't do a "save" (and would thus have - * access to %o7 and %i7 directly) but the call to write() at the end - * would have also prevented this. - * - * -- [eichin:19920702.1107EST] - */ - -static void internal_mcount (char *, unsigned short *) __attribute__ ((used)); - -/* i7 == last ret, -> frompcindex */ -/* o7 == current ret, -> selfpc */ /* Solaris 2 libraries use _mcount. */ -asm(".global _mcount; _mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount"); -/* This is for compatibility with old versions of gcc which used mcount. */ -asm(".global mcount; mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount"); +#if defined __i386__ +asm(".globl _mcount\n" + "_mcount:\n" + " jmp internal_mcount\n"); #elif defined __x86_64__ -extern void internal_mcount (char *, unsigned short *); - /* See GLIBC for additional information about this technique. */ asm(".globl _mcount\n" - "\t.type\t_mcount, @function\n" + " .type _mcount, @function\n" "_mcount:\n" /* The compiler calls _mcount after the prologue, and does not save any of the registers. Therefore we must preserve all seven registers which may contain function arguments. */ - "\tsubq\t$0x38,%rsp\n" - "\tmovq\t%rax,(%rsp)\n" - "\tmovq\t%rcx,0x08(%rsp)\n" - "\tmovq\t%rdx,0x10(%rsp)\n" - "\tmovq\t%rsi,0x18(%rsp)\n" - "\tmovq\t%rdi,0x20(%rsp)\n" - "\tmovq\t%r8,0x28(%rsp)\n" - "\tmovq\t%r9,0x30(%rsp)\n" + " subq $0x38, %rsp\n" + " movq %rax, (%rsp)\n" + " movq %rcx, 0x08(%rsp)\n" + " movq %rdx, 0x10(%rsp)\n" + " movq %rsi, 0x18(%rsp)\n" + " movq %rdi, 0x20(%rsp)\n" + " movq %r8, 0x28(%rsp)\n" + " movq %r9, 0x30(%rsp)\n" /* Get SELFPC (pushed by the call to this function) and - FROMPCINDEX (via the frame pointer. */ - "\tmovq\t0x38(%rsp),%rdi\n" - "\tmovq\t0x8(%rbp),%rsi\n" - "\tcall\tinternal_mcount\n" + FROMPCINDEX (via the frame pointer). */ + " movq 0x38(%rsp), %rdi\n" + " movq 0x8(%rbp), %rsi\n" + " call internal_mcount\n" /* Restore the saved registers. */ - "\tmovq\t0x30(%rsp),%r9\n" - "\tmovq\t0x28(%rsp),%r8\n" - "\tmovq\t0x20(%rsp),%rdi\n" - "\tmovq\t0x18(%rsp),%rsi\n" - "\tmovq\t0x10(%rsp),%rdx\n" - "\tmovq\t0x08(%rsp),%rcx\n" - "\tmovq\t(%rsp),%rax\n" - "\taddq\t$0x38,%rsp\n" - "\tretq\n" - ); -#else -extern void internal_mcount (void); - - /* Solaris 2 libraries use _mcount. */ -asm(".globl _mcount; _mcount: jmp internal_mcount"); - /* This is for compatibility with old versions of gcc which used mcount. */ -asm(".globl mcount; mcount: jmp internal_mcount"); + " movq 0x30(%rsp), %r9\n" + " movq 0x28(%rsp), %r8\n" + " movq 0x20(%rsp), %rdi\n" + " movq 0x18(%rsp), %rsi\n" + " movq 0x10(%rsp), %rdx\n" + " movq 0x08(%rsp), %rcx\n" + " movq (%rsp), %rax\n" + " addq $0x38, %rsp\n" + " retq\n"); +#elif defined __sparc__ +/* The SPARC stack frame is only held together by the frame pointers + in the register windows. According to the SVR4 SPARC ABI + Supplement, Low Level System Information/Operating System + Interface/Software Trap Types, a type 3 trap will flush all of the + register windows to the stack, which will make it possible to walk + the frames and find the return addresses. + However, it seems awfully expensive to incur a trap (system + call) for every function call. It turns out that "call" simply puts + the return address in %o7 expecting the "save" in the procedure to + shift it into %i7; this means that before the "save" occurs, %o7 + contains the address of the call to mcount, and %i7 still contains + the caller above that. The asm mcount here simply saves those + registers in argument registers and branches to internal_mcount, + simulating a call with arguments. + Kludges: + 1) the branch to internal_mcount is hard coded; it should be + possible to tell asm to use the assembler-name of a symbol. + 2) in theory, the function calling mcount could have saved %i7 + somewhere and reused the register; in practice, I *think* this will + break longjmp (and maybe the debugger) but I'm not certain. (I take + some comfort in the knowledge that it will break the native mcount + as well.) + 3) if builtin_return_address worked, this could be portable. + However, it would really have to be optimized for arguments of 0 + and 1 and do something like what we have here in order to avoid the + trap per function call performance hit. + 4) the atexit and monsetup calls prevent this from simply + being a leaf routine that doesn't do a "save" (and would thus have + access to %o7 and %i7 directly) but the call to write() at the end + would have also prevented this. + + -- [eichin:19920702.1107EST] */ +asm(".global _mcount\n" + "_mcount:\n" + /* i7 == last ret, -> frompcindex. */ + " mov %i7, %o1\n" + /* o7 == current ret, -> selfpc. */ + " mov %o7, %o0\n" + " b,a internal_mcount\n"); #endif -#ifdef __sparc__ -static -#endif -void -internal_mcount ( -#if defined __sparc__ || defined __x86_64__ - char *selfpc, - unsigned short *frompcindex +static void +#ifdef __i386__ +internal_mcount (void) #else - void +internal_mcount (char *selfpc, unsigned short *frompcindex) #endif - ) { -#if !defined __sparc__ && !defined __x86_64__ - register char *selfpc; - register unsigned short *frompcindex; -#endif - register struct tostruct *top; - register struct tostruct *prevtop; - register long toindex; - static char already_setup; - -#if !defined __sparc__ && !defined __x86_64__ - /* - * find the return address for mcount, - * and the return address for mcount's caller. - */ - - /* selfpc = pc pushed by mcount call. - This identifies the function that was just entered. */ - selfpc = (void *) __builtin_return_address (0); - /* frompcindex = pc in preceding frame. - This identifies the caller of the function just entered. */ - frompcindex = (void *) __builtin_return_address (1); -#endif + struct tostruct *top; + struct tostruct *prevtop; + long toindex; + static char already_setup; + +#ifdef __i386__ + char *selfpc; + unsigned short *frompcindex; - if(!already_setup) { - extern char etext[]; -#ifdef __sparc__ - extern char _start[]; - extern char _init[]; + /* Find the return address for mcount and the return address for mcount's + caller. */ + + /* selfpc = pc pushed by mcount call. + This identifies the function that was just entered. */ + selfpc = (void *) __builtin_return_address (0); + /* frompcindex = pc in preceding frame. + This identifies the caller of the function just entered. */ + frompcindex = (void *) __builtin_return_address (1); #endif - already_setup = 1; -#if defined __sparc__ - monstartup(_start < _init ? _start : _init, etext); + + if(!already_setup) { + extern char etext[]; + + already_setup = 1; + +#if defined __i386__ + /* <sys/vmparam.h> USERSTACK. */ + monstartup ((char *) 0x8048000, etext); #elif defined __x86_64__ - monstartup(0, etext); -#else - monstartup((char*)0x08040000, etext); -#endif -#ifdef USE_ONEXIT - on_exit(_mcleanup, 0); -#else - atexit(_mcleanup); + monstartup (NULL, etext); +#elif defined __sparc__ + { + extern char _start[]; + extern char _init[]; + + monstartup (_start < _init ? _start : _init, etext); + } #endif - } - /* - * check that we are profiling - * and that we aren't recursively invoked. - */ - if (profiling) { - goto out; - } - profiling++; - /* - * check that frompcindex is a reasonable pc value. - * for example: signal catchers get called from the stack, - * not from text space. too bad. - */ - frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc); - if ((unsigned long)frompcindex > s_textsize) { - goto done; - } - frompcindex = - &froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))]; - toindex = *frompcindex; - if (toindex == 0) { - /* - * first time traversing this arc - */ - toindex = ++tos[0].link; - if (toindex >= tolimit) { - goto overflow; - } - *frompcindex = toindex; - top = &tos[toindex]; - top->selfpc = selfpc; - top->count = 1; - top->link = 0; - goto done; - } - top = &tos[toindex]; - if (top->selfpc == selfpc) { - /* - * arc at front of chain; usual case. - */ - top->count++; - goto done; - } - /* - * have to go looking down chain for it. - * top points to what we are looking at, - * prevtop points to previous top. - * we know it is not at the head of the chain. - */ - for (; /* goto done */; ) { - if (top->link == 0) { - /* - * top is end of the chain and none of the chain - * had top->selfpc == selfpc. - * so we allocate a new tostruct - * and link it to the head of the chain. - */ - toindex = ++tos[0].link; - if (toindex >= tolimit) { - goto overflow; - } - top = &tos[toindex]; - top->selfpc = selfpc; - top->count = 1; - top->link = *frompcindex; - *frompcindex = toindex; - goto done; - } - /* - * otherwise, check the next arc on the chain. - */ - prevtop = top; - top = &tos[top->link]; - if (top->selfpc == selfpc) { - /* - * there it is. - * increment its count - * move it to the head of the chain. - */ - top->count++; - toindex = prevtop->link; - prevtop->link = top->link; - top->link = *frompcindex; - *frompcindex = toindex; - goto done; - } - - } -done: - profiling--; - /* and fall through */ -out: - return; /* normal return restores saved registers */ - -overflow: - profiling++; /* halt further profiling */ -# define TOLIMIT "mcount: tos overflow\n" - write(2, TOLIMIT, sizeof(TOLIMIT)); - goto out; + atexit (_mcleanup); + } + /* Check that we are profiling and that we aren't recursively invoked. */ + if (profiling) { + goto out; + } + profiling++; + /* Check that frompcindex is a reasonable pc value. For example: signal + catchers get called from the stack, not from text space. too bad. */ + frompcindex = (unsigned short *) ((long) frompcindex - (long) s_lowpc); + if ((unsigned long) frompcindex > s_textsize) { + goto done; + } + frompcindex = &froms[((long) frompcindex) / (HASHFRACTION * sizeof (*froms))]; + toindex = *frompcindex; + if (toindex == 0) { + /* First time traversing this arc. */ + toindex = ++tos[0].link; + if (toindex >= tolimit) { + goto overflow; + } + *frompcindex = toindex; + top = &tos[toindex]; + top->selfpc = selfpc; + top->count = 1; + top->link = 0; + goto done; + } + top = &tos[toindex]; + if (top->selfpc == selfpc) { + /* arc at front of chain; usual case. */ + top->count++; + goto done; + } + /* Have to go looking down chain for it. Top points to what we are + looking at, prevtop points to previous top. We know it is not at the + head of the chain. */ + for (; /* goto done */; ) { + if (top->link == 0) { + /* top is end of the chain and none of the chain had top->selfpc == + selfpc, so we allocate a new tostruct and link it to the head of + the chain. */ + toindex = ++tos[0].link; + if (toindex >= tolimit) { + goto overflow; + } + top = &tos[toindex]; + top->selfpc = selfpc; + top->count = 1; + top->link = *frompcindex; + *frompcindex = toindex; + goto done; + } + /* Otherwise, check the next arc on the chain. */ + prevtop = top; + top = &tos[top->link]; + if (top->selfpc == selfpc) { + /* There it is. Increment its count move it to the head of the + chain. */ + top->count++; + toindex = prevtop->link; + prevtop->link = top->link; + top->link = *frompcindex; + *frompcindex = toindex; + goto done; + } + + } + done: + profiling--; + /* ... and fall through. */ + out: + /* Normal return restores saved registers. */ + return; + + overflow: + /* Halt further profiling. */ + profiling++; + +#define TOLIMIT "mcount: tos overflow\n" + write (STDERR_FILENO, TOLIMIT, sizeof (TOLIMIT)); + goto out; } -/* - * Control profiling - * profiling is what mcount checks to see if - * all the data structures are ready. - */ -static void moncontrol(int mode) +/* Control profiling. Profiling is what mcount checks to see if all the + data structures are ready. */ +static void +moncontrol (int mode) { - if (mode) { - /* start */ - profil((unsigned short *)(sbuf + sizeof(struct phdr)), - ssiz - sizeof(struct phdr), - (size_t)s_lowpc, s_scale); - - profiling = 0; - } else { - /* stop */ - profil((unsigned short *)0, 0, 0, 0); - profiling = 3; - } + if (mode) { + /* Start. */ + profil ((unsigned short *) (sbuf + sizeof (struct phdr)), + ssiz - sizeof (struct phdr), (size_t) s_lowpc, s_scale); + profiling = 0; + } else { + /* Stop. */ + profil ((unsigned short *) 0, 0, 0, 0); + profiling = 3; + } } |