David Greenman's latest changes to eliminate much stack-walking jazz
(no more sbrk_init()!).
This commit is contained in:
Jordan K. Hubbard
parent
25915e75e3
commit
a0b8281d40
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=835
@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: rtld.c,v 1.7 1993/12/02 01:03:26 jkh Exp $
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* $Id: rtld.c,v 1.8 1993/12/04 00:53:16 jkh Exp $
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*/
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#include <machine/vmparam.h>
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@ -384,7 +384,7 @@ struct link_map *lmp;
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fatal("Cannot map %s text\n", path);
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if (mmap(addr + hdr.a_text, hdr.a_data,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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PROT_READ|PROT_WRITE,
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MAP_FILE|MAP_FIXED|MAP_COPY,
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fd, hdr.a_text) == (caddr_t)-1)
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fatal("Cannot map %s data", path);
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@ -397,7 +397,7 @@ struct link_map *lmp;
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perror("/dev/zero");
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#endif
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if (hdr.a_bss && mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_FIXED|MAP_COPY,
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fd, hdr.a_text + hdr.a_data) == (caddr_t)-1)
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fatal("Cannot map %s bss", path);
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@ -990,26 +990,6 @@ char *sym;
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static caddr_t curbrk;
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static void
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init_brk()
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{
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struct rlimit rlim;
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char *cp, **cpp = environ;
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if (getrlimit(RLIMIT_STACK, &rlim) < 0) {
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xprintf("ld.so: brk: getrlimit failure\n");
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_exit(1);
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}
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if (environ < USRSTACK - MAXSSIZ) {
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curbrk = (caddr_t)
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(((long)(USRSTACK - MAXSSIZ - rlim.rlim_cur) + PAGSIZ) & ~(PAGSIZ - 1));
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} else {
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curbrk = (caddr_t)
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(((long)(USRSTACK - rlim.rlim_cur) + PAGSIZ) & ~(PAGSIZ - 1)) ;
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}
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}
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void
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#if __STDC__
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xprintf(char *fmt, ...)
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@ -1031,82 +1011,18 @@ char *fmt;
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va_end(ap);
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}
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#if 1
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caddr_t
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sbrk(incr)
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int incr;
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{
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int fd = -1;
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caddr_t oldbrk;
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if (curbrk == 0)
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init_brk();
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/* Round-up increment to page size */
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incr = ((incr + PAGSIZ - 1) & ~(PAGSIZ - 1));
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#if DEBUG
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#endif
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if (incr == 0)
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return curbrk;
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incr = (incr + PAGSIZ - 1) & ~(PAGSIZ - 1);
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#ifdef NEED_DEV_ZERO
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fd = open("/dev/zero", O_RDWR, 0);
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if (fd == -1)
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perror("/dev/zero");
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#endif
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if (mmap(curbrk, incr,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_FIXED|MAP_COPY, fd, 0) == (caddr_t)-1) {
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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#ifdef NEED_DEV_ZERO
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close(fd);
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#endif
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oldbrk = curbrk;
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#if TRY_THIS_FOR_A_CHANGE
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curbrk -= incr;
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#else
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curbrk += incr;
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#endif
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return oldbrk;
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}
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#else
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caddr_t
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sbrk(incr)
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int incr;
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{
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int fd = -1;
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caddr_t oldbrk;
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#if DEBUG
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#endif
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if (curbrk == 0 && (curbrk = mmap(0, PAGSIZ,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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/* There's valid memory from `curbrk' to next page boundary */
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if ((long)curbrk + incr <= (((long)curbrk + PAGSIZ) & ~(PAGSIZ - 1))) {
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oldbrk = curbrk;
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curbrk += incr;
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return oldbrk;
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}
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/*
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* If asking for than currently left in this chunk,
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* go somewhere completely different.
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*/
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#ifdef NEED_DEV_ZERO
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fd = open("/dev/zero", O_RDWR, 0);
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@ -1117,16 +1033,14 @@ xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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if ((curbrk = mmap(0, incr,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
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perror("Cannot map anonymous memory");
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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#ifdef NEED_DEV_ZERO
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close(fd);
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#endif
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oldbrk = curbrk;
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curbrk += incr;
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return oldbrk;
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return(curbrk);
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}
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#endif
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@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: rtld.c,v 1.7 1993/12/02 01:03:26 jkh Exp $
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* $Id: rtld.c,v 1.8 1993/12/04 00:53:16 jkh Exp $
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*/
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#include <machine/vmparam.h>
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@ -384,7 +384,7 @@ struct link_map *lmp;
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fatal("Cannot map %s text\n", path);
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if (mmap(addr + hdr.a_text, hdr.a_data,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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PROT_READ|PROT_WRITE,
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MAP_FILE|MAP_FIXED|MAP_COPY,
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fd, hdr.a_text) == (caddr_t)-1)
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fatal("Cannot map %s data", path);
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@ -397,7 +397,7 @@ struct link_map *lmp;
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perror("/dev/zero");
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#endif
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if (hdr.a_bss && mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_FIXED|MAP_COPY,
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fd, hdr.a_text + hdr.a_data) == (caddr_t)-1)
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fatal("Cannot map %s bss", path);
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@ -990,26 +990,6 @@ char *sym;
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static caddr_t curbrk;
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static void
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init_brk()
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{
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struct rlimit rlim;
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char *cp, **cpp = environ;
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if (getrlimit(RLIMIT_STACK, &rlim) < 0) {
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xprintf("ld.so: brk: getrlimit failure\n");
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_exit(1);
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}
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if (environ < USRSTACK - MAXSSIZ) {
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curbrk = (caddr_t)
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(((long)(USRSTACK - MAXSSIZ - rlim.rlim_cur) + PAGSIZ) & ~(PAGSIZ - 1));
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} else {
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curbrk = (caddr_t)
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(((long)(USRSTACK - rlim.rlim_cur) + PAGSIZ) & ~(PAGSIZ - 1)) ;
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}
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}
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void
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#if __STDC__
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xprintf(char *fmt, ...)
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@ -1031,82 +1011,18 @@ char *fmt;
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va_end(ap);
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}
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#if 1
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caddr_t
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sbrk(incr)
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int incr;
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{
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int fd = -1;
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caddr_t oldbrk;
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if (curbrk == 0)
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init_brk();
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/* Round-up increment to page size */
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incr = ((incr + PAGSIZ - 1) & ~(PAGSIZ - 1));
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#if DEBUG
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#endif
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if (incr == 0)
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return curbrk;
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incr = (incr + PAGSIZ - 1) & ~(PAGSIZ - 1);
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#ifdef NEED_DEV_ZERO
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fd = open("/dev/zero", O_RDWR, 0);
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if (fd == -1)
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perror("/dev/zero");
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#endif
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if (mmap(curbrk, incr,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_FIXED|MAP_COPY, fd, 0) == (caddr_t)-1) {
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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#ifdef NEED_DEV_ZERO
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close(fd);
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#endif
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oldbrk = curbrk;
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#if TRY_THIS_FOR_A_CHANGE
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curbrk -= incr;
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#else
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curbrk += incr;
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#endif
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return oldbrk;
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}
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#else
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caddr_t
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sbrk(incr)
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int incr;
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{
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int fd = -1;
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caddr_t oldbrk;
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#if DEBUG
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xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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#endif
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if (curbrk == 0 && (curbrk = mmap(0, PAGSIZ,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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/* There's valid memory from `curbrk' to next page boundary */
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if ((long)curbrk + incr <= (((long)curbrk + PAGSIZ) & ~(PAGSIZ - 1))) {
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oldbrk = curbrk;
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curbrk += incr;
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return oldbrk;
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}
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/*
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* If asking for than currently left in this chunk,
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* go somewhere completely different.
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*/
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#ifdef NEED_DEV_ZERO
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fd = open("/dev/zero", O_RDWR, 0);
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@ -1117,16 +1033,14 @@ xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
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if ((curbrk = mmap(0, incr,
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PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
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perror("Cannot map anonymous memory");
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xprintf("Cannot map anonymous memory");
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_exit(1);
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}
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#ifdef NEED_DEV_ZERO
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close(fd);
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#endif
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oldbrk = curbrk;
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curbrk += incr;
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return oldbrk;
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return(curbrk);
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}
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#endif
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