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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/libmach/map.c – Rev 2

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/*
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 * file map routines
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 */
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <mach.h>
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Map *
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newmap(Map *map, int n)
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{
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	int size;
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	size = sizeof(Map)+(n-1)*sizeof(struct segment);
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	if (map == 0)
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		map = malloc(size);
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	else
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		map = realloc(map, size);
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	if (map == 0) {
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		werrstr("out of memory: %r");
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		return 0;
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	}
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	memset(map, 0, size);
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	map->nsegs = n;
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	return map;
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}
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int
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setmap(Map *map, int fd, uvlong b, uvlong e, vlong f, char *name)
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{
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	int i;
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	if (map == 0)
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		return 0;
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	for (i = 0; i < map->nsegs; i++)
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		if (!map->seg[i].inuse)
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			break;
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	if (i >= map->nsegs)
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		return 0;
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	map->seg[i].b = b;
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	map->seg[i].e = e;
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	map->seg[i].f = f;
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	map->seg[i].inuse = 1;
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	map->seg[i].name = name;
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	map->seg[i].fd = fd;
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	return 1;
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}
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static uvlong
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stacktop(int pid)
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{
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	char buf[64];
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	int fd;
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	int n;
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	char *cp;
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	snprint(buf, sizeof(buf), "/proc/%d/segment", pid);
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	fd = open(buf, 0);
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	if (fd < 0)
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		return 0;
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	n = read(fd, buf, sizeof(buf)-1);
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	close(fd);
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	buf[n] = 0;
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	if (strncmp(buf, "Stack", 5))
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		return 0;
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	for (cp = buf+5; *cp && *cp == ' '; cp++)
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		;
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	if (!*cp)
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		return 0;
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	cp = strchr(cp, ' ');
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	if (!cp)
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		return 0;
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	while (*cp && *cp == ' ')
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		cp++;
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	if (!*cp)
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		return 0;
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	return strtoull(cp, 0, 16);
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}
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Map*
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attachproc(int pid, int kflag, int corefd, Fhdr *fp)
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{
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	char buf[64], *regs;
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	int fd;
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	Map *map;
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	uvlong n;
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	map = newmap(0, 4);
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	if (!map)
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		return 0;
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	if(kflag)
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		regs = "kregs";
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	else
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		regs = "regs";
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	if (mach->regsize) {
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		sprint(buf, "/proc/%d/%s", pid, regs);
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		fd = open(buf, ORDWR);
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		if(fd < 0)
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			fd = open(buf, OREAD);
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		if(fd < 0) {
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			free(map);
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			return 0;
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		}
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		setmap(map, fd, 0, mach->regsize, 0, "regs");
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	}
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	if (mach->fpregsize) {
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		sprint(buf, "/proc/%d/fpregs", pid);
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		fd = open(buf, ORDWR);
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		if(fd < 0)
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			fd = open(buf, OREAD);
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		if(fd < 0) {
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			close(map->seg[0].fd);
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			free(map);
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			return 0;
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		}
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		setmap(map, fd, mach->regsize, mach->regsize+mach->fpregsize, 0, "fpregs");
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	}
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	setmap(map, corefd, fp->txtaddr, fp->txtaddr+fp->txtsz, fp->txtaddr, "text");
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	if(kflag || fp->dataddr >= mach->utop) {
120 
		setmap(map, corefd, fp->dataddr, ~0, fp->dataddr, "data");
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		return map;
122 
	}
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	n = stacktop(pid);
124 
	if (n == 0) {
125 
		setmap(map, corefd, fp->dataddr, mach->utop, fp->dataddr, "data");
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		return map;
127 
	}
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	setmap(map, corefd, fp->dataddr, n, fp->dataddr, "data");
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	return map;
130 
}
131 
 
132 
int
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findseg(Map *map, char *name)
134 
{
135 
	int i;
136 
 
137 
	if (!map)
138 
		return -1;
139 
	for (i = 0; i < map->nsegs; i++)
140 
		if (map->seg[i].inuse && !strcmp(map->seg[i].name, name))
141 
			return i;
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	return -1;
143 
}
144 
 
145 
void
146 
unusemap(Map *map, int i)
147 
{
148 
	if (map != 0 && 0 <= i && i < map->nsegs)
149 
		map->seg[i].inuse = 0;
150 
}
151 
 
152 
Map*
153 
loadmap(Map *map, int fd, Fhdr *fp)
154 
{
155 
	map = newmap(map, 2);
156 
	if (map == 0)
157 
		return 0;
158 
 
159 
	map->seg[0].b = fp->txtaddr;
160 
	map->seg[0].e = fp->txtaddr+fp->txtsz;
161 
	map->seg[0].f = fp->txtoff;
162 
	map->seg[0].fd = fd;
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	map->seg[0].inuse = 1;
164 
	map->seg[0].name = "text";
165 
	map->seg[1].b = fp->dataddr;
166 
	map->seg[1].e = fp->dataddr+fp->datsz;
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	map->seg[1].f = fp->datoff;
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	map->seg[1].fd = fd;
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	map->seg[1].inuse = 1;
170 
	map->seg[1].name = "data";
171 
	return map;
172 
}