inferno-os tree was separated from the inferno-os-android (separated from the Android driver)

1 files changed, 203 insertions, 0 deletions

diff --git a/utils/libmach/map.c b/utils/libmach/map.c
new file mode 100644
index 0000000..12bee1b
--- /dev/null
+++ b/utils/libmach/map.c
@@ -0,0 +1,203 @@
+/*
+ * file map routines
+ */
+#include <lib9.h>
+#include <bio.h>
+#include "mach.h"
+
+Map *
+newmap(Map *map, int n)
+{
+	int size;
+
+	size = sizeof(Map)+(n-1)*sizeof(struct segment);
+	if (map == 0)
+		map = malloc(size);
+	else
+		map = realloc(map, size);
+	if (map == 0) {
+		werrstr("out of memory: %r");
+		return 0;
+	}
+	memset(map, 0, size);
+	map->nsegs = n;
+	return map;
+}
+
+int
+setmap(Map *map, int fd, uvlong b, uvlong e, vlong f, char *name)
+{
+	int i;
+
+	if (map == 0)
+		return 0;
+	for (i = 0; i < map->nsegs; i++)
+		if (!map->seg[i].inuse)
+			break;
+	if (i >= map->nsegs)
+		return 0;
+	map->seg[i].b = b;
+	map->seg[i].e = e;
+	map->seg[i].f = f;
+	map->seg[i].inuse = 1;
+	map->seg[i].name = name;
+	map->seg[i].fd = fd;
+	return 1;
+}
+
+static uvlong
+stacktop(int pid)
+{
+	char buf[64];
+	int fd;
+	int n;
+	char *cp;
+
+	snprint(buf, sizeof(buf), "/proc/%d/segment", pid);
+	fd = open(buf, 0);
+	if (fd < 0)
+		return 0;
+	n = read(fd, buf, sizeof(buf)-1);
+	close(fd);
+	buf[n] = 0;
+	if (strncmp(buf, "Stack", 5))
+		return 0;
+	for (cp = buf+5; *cp && *cp == ' '; cp++)
+		;
+	if (!*cp)
+		return 0;
+	cp = strchr(cp, ' ');
+	if (!cp)
+		return 0;
+	while (*cp && *cp == ' ')
+		cp++;
+	if (!*cp)
+		return 0;
+	return strtoull(cp, 0, 16);
+}
+
+Map*
+attachproc(int pid, int kflag, int corefd, Fhdr *fp)
+{
+	char buf[64], *regs;
+	int fd;
+	Map *map;
+	uvlong n;
+
+	map = newmap(0, 4);
+	if (!map)
+		return 0;
+	if(kflag)
+		regs = "kregs";
+	else
+		regs = "regs";
+	if (mach->regsize) {
+		sprint(buf, "/proc/%d/%s", pid, regs);
+		fd = open(buf, ORDWR);
+		if(fd < 0)
+			fd = open(buf, OREAD);
+		if(fd < 0) {
+			free(map);
+			return 0;
+		}
+		setmap(map, fd, 0, mach->regsize, 0, "regs");
+	}
+	if (mach->fpregsize) {
+		sprint(buf, "/proc/%d/fpregs", pid);
+		fd = open(buf, ORDWR);
+		if(fd < 0)
+			fd = open(buf, OREAD);
+		if(fd < 0) {
+			close(map->seg[0].fd);
+			free(map);
+			return 0;
+		}
+		setmap(map, fd, mach->regsize, mach->regsize+mach->fpregsize, 0, "fpregs");
+	}
+	setmap(map, corefd, fp->txtaddr, fp->txtaddr+fp->txtsz, fp->txtaddr, "text");
+	if(kflag || fp->dataddr >= mach->utop) {
+		setmap(map, corefd, fp->dataddr, ~0, fp->dataddr, "data");
+		return map;
+	}
+	n = stacktop(pid);
+	if (n == 0) {
+		setmap(map, corefd, fp->dataddr, mach->utop, fp->dataddr, "data");
+		return map;
+	}
+	setmap(map, corefd, fp->dataddr, n, fp->dataddr, "data");
+	return map;
+}
+	
+int
+findseg(Map *map, char *name)
+{
+	int i;
+
+	if (!map)
+		return -1;
+	for (i = 0; i < map->nsegs; i++)
+		if (map->seg[i].inuse && !strcmp(map->seg[i].name, name))
+			return i;
+	return -1;
+}
+
+void
+unusemap(Map *map, int i)
+{
+	if (map != 0 && 0 <= i && i < map->nsegs)
+		map->seg[i].inuse = 0;
+}
+
+Map*
+loadmap(Map *map, int fd, Fhdr *fp)
+{
+	map = newmap(map, 2);
+	if (map == 0)
+		return 0;
+
+	map->seg[0].b = fp->txtaddr;
+	map->seg[0].e = fp->txtaddr+fp->txtsz;
+	map->seg[0].f = fp->txtoff;
+	map->seg[0].fd = fd;
+	map->seg[0].inuse = 1;
+	map->seg[0].name = "text";
+	map->seg[1].b = fp->dataddr;
+	map->seg[1].e = fp->dataddr+fp->datsz;
+	map->seg[1].f = fp->datoff;
+	map->seg[1].fd = fd;
+	map->seg[1].inuse = 1;
+	map->seg[1].name = "data";
+	return map;
+}
+
+Map*
+attachremt(int fd, Fhdr *f)
+{
+	Map *m;
+	ulong txt;
+
+	m = newmap(0, 3);
+	if (m == 0)
+		return 0;
+
+	/* Space for mach structures */
+	txt = f->txtaddr;
+	if(txt > 8*4096)
+		txt -= 8*4096;
+
+	setmap(m, fd, txt, f->txtaddr+f->txtsz, txt, "*text");
+	/*setmap(m, fd, f->dataddr, 0xffffffff, f->dataddr, "*data");*/ /* pc heap is < KTZERO */
+	setmap(m, fd, 4096, 0xffffffff, 4096, "*data");
+	setmap(m, fd, 0x0, mach->regsize, 0, "kreg");
+
+	return m;
+}
+
+void
+setmapio(Map *map, int i, Rsegio get, Rsegio put)
+{
+	if (map != 0 && 0 <= i && i < map->nsegs) {
+		map->seg[i].mget = get;
+		map->seg[i].mput = put;
+	}
+}