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Replace the last non-optional use of sbrk() in the tree with mmap().

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All gmon want's is a region of memory without the overhead of malloc().
Just mapping some pages with mmap is an easy way to accomplish this.

Approved by:	jhb, cem, emaste
Obtained from:	CheriBSD (bf33e1e70b368ababde74aa3ac70d108c8a52c69)
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D5005
This commit is contained in:
Brooks Davis 2016-01-21 18:17:19 +00:00
parent f919b7a664
commit af6f4233fd
1 changed files with 4 additions and 11 deletions
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15
lib/libc/gmon/gmon.c
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@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/gmon.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <err.h>
@ -50,14 +51,6 @@ __FBSDID("$FreeBSD$");
#include "libc_private.h"
#if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || (defined(__powerpc__) && !defined(__powerpc64__))
extern char *minbrk __asm (".minbrk");
#elif defined(__powerpc64__)
extern char *minbrk __asm ("_minbrk");
#else
extern char *minbrk __asm ("minbrk");
#endif
struct gmonparam _gmonparam = { GMON_PROF_OFF };
static int s_scale;
@ -94,8 +87,9 @@ monstartup(u_long lowpc, u_long highpc)
p->tolimit = MAXARCS;
p->tossize = p->tolimit * sizeof(struct tostruct);
cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
if (cp == (char *)-1) {
cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
if (cp == MAP_FAILED) {
ERR("monstartup: out of memory\n");
return;
}
@ -108,7 +102,6 @@ monstartup(u_long lowpc, u_long highpc)
cp += p->kcountsize;
p->froms = (u_short *)cp;
minbrk = sbrk(0);
p->tos[0].link = 0;
o = p->highpc - p->lowpc;