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[src/trunk]: src/sys/compat/netbsd32 Add compatibility for pre MIDMAGIC a.out...
details: https://anonhg.NetBSD.org/src/rev/0b412d9b8db2
branches: trunk
changeset: 804908:0b412d9b8db2
user: christos <christos%NetBSD.org@localhost>
date: Fri Dec 05 22:21:47 2014 +0000
description:
Add compatibility for pre MIDMAGIC a.out binaries (with COMPAT_NOMID)
Oldzmagic binaries need "sysctl -w vm.user_va0_disable=0"
diffstat:
sys/compat/netbsd32/netbsd32_exec_aout.c | 214 ++++++++++++++++++++++++++++++-
1 files changed, 211 insertions(+), 3 deletions(-)
diffs (247 lines):
diff -r 327b728815b8 -r 0b412d9b8db2 sys/compat/netbsd32/netbsd32_exec_aout.c
--- a/sys/compat/netbsd32/netbsd32_exec_aout.c Fri Dec 05 19:24:41 2014 +0000
+++ b/sys/compat/netbsd32/netbsd32_exec_aout.c Fri Dec 05 22:21:47 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: netbsd32_exec_aout.c,v 1.28 2014/10/24 21:08:36 christos Exp $ */
+/* $NetBSD: netbsd32_exec_aout.c,v 1.29 2014/12/05 22:21:47 christos Exp $ */
/* from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
/*
@@ -57,7 +57,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_aout.c,v 1.28 2014/10/24 21:08:36 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_aout.c,v 1.29 2014/12/05 22:21:47 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -78,6 +78,10 @@
#include <machine/frame.h>
#include <machine/netbsd32_machdep.h>
+#ifdef COMPAT_NOMID
+static int netbsd32_exec_aout_nomid(struct lwp *, struct exec_package *);
+#endif
+
/*
* exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format
* executable.
@@ -122,8 +126,11 @@
error = netbsd32_exec_aout_prep_omagic(l, epp);
break;
default:
- /* Invalid magic */
+#ifdef COMPAT_NOMID
+ error = netbsd32_exec_aout_nomid(l, epp);
+#else
error = ENOEXEC;
+#endif
break;
}
@@ -265,3 +272,204 @@
epp->ep_dsize = (dsize > 0) ? dsize : 0;
return (*epp->ep_esch->es_setup_stack)(l, epp);
}
+
+#ifdef COMPAT_NOMID
+/*
+ * netbsd32_exec_aout_prep_oldzmagic():
+ * Prepare the vmcmds to build a vmspace for an old ZMAGIC
+ * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
+ *
+ * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
+ * description of operation is there.
+ * There were copies of this in the mac68k, hp300, and i386 ports.
+ */
+static int
+netbsd32_exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp)
+{
+ struct netbsd32_exec *execp = epp->ep_hdr;
+ int error;
+
+ epp->ep_taddr = 0;
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = epp->ep_taddr + execp->a_text;
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+ epp->ep_vm_minaddr = VM_MIN_ADDRESS;
+ epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
+
+ error = vn_marktext(epp->ep_vp);
+ if (error)
+ return (error);
+
+ /* set up command for text segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
+ epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */
+ VM_PROT_READ|VM_PROT_EXECUTE);
+
+ /* set up command for data segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
+ epp->ep_daddr, epp->ep_vp,
+ execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ if (execp->a_bss)
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+ epp->ep_daddr + execp->a_data, NULLVP, 0,
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ return (*epp->ep_esch->es_setup_stack)(l, epp);
+}
+
+
+/*
+ * netbsd32_exec_aout_prep_oldnmagic():
+ * Prepare the vmcmds to build a vmspace for an old NMAGIC
+ * binary. [BSDI]
+ *
+ * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
+ * at 0.
+ * XXX: There must be a better way to share this code.
+ */
+static int
+netbsd32_exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp)
+{
+ struct netbsd32_exec *execp = epp->ep_hdr;
+ long bsize, baddr;
+
+ epp->ep_taddr = 0;
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+ epp->ep_vm_minaddr = VM_MIN_ADDRESS;
+ epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
+
+ /* set up command for text segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+ epp->ep_taddr, epp->ep_vp, sizeof(struct netbsd32_exec),
+ VM_PROT_READ|VM_PROT_EXECUTE);
+
+ /* set up command for data segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+ epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct netbsd32_exec),
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
+ bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+ if (bsize > 0)
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+ NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ return (*epp->ep_esch->es_setup_stack)(l, epp);
+}
+
+
+/*
+ * netbsd32_exec_aout_prep_oldomagic():
+ * Prepare the vmcmds to build a vmspace for an old OMAGIC
+ * binary. [BSDI]
+ *
+ * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
+ * at 0.
+ * XXX: There must be a better way to share this code.
+ */
+static int
+netbsd32_exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp)
+{
+ struct netbsd32_exec *execp = epp->ep_hdr;
+ long dsize, bsize, baddr;
+
+ epp->ep_taddr = 0;
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = epp->ep_taddr + execp->a_text;
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+
+ /* set up command for text and data segments */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
+ execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
+ sizeof(struct netbsd32_exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
+ bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+ if (bsize > 0)
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+ NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /*
+ * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
+ * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
+ * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
+ * respectively to page boundaries.
+ * Compensate `ep_dsize' for the amount of data covered by the last
+ * text page.
+ */
+ dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
+ PAGE_SIZE);
+ epp->ep_dsize = (dsize > 0) ? dsize : 0;
+ return (*epp->ep_esch->es_setup_stack)(l, epp);
+}
+
+static int
+netbsd32_exec_aout_nomid(struct lwp *l, struct exec_package *epp)
+{
+ int error;
+ u_long midmag, magic;
+ u_short mid;
+ struct exec *execp = epp->ep_hdr;
+
+ /* check on validity of epp->ep_hdr performed by exec_out_makecmds */
+
+ midmag = ntohl(execp->a_midmag);
+ mid = (midmag >> 16) & 0xffff;
+ magic = midmag & 0xffff;
+
+ if (magic == 0) {
+ magic = (execp->a_midmag & 0xffff);
+ mid = MID_ZERO;
+ }
+
+ midmag = mid << 16 | magic;
+
+ switch (midmag) {
+ case (MID_ZERO << 16) | ZMAGIC:
+ /*
+ * 386BSD's ZMAGIC format:
+ */
+ return netbsd32_exec_aout_prep_oldzmagic(l, epp);
+ break;
+
+ case (MID_ZERO << 16) | QMAGIC:
+ /*
+ * BSDI's QMAGIC format:
+ * same as new ZMAGIC format, but with different magic number
+ */
+ return netbsd32_exec_aout_prep_zmagic(l, epp);
+ break;
+
+ case (MID_ZERO << 16) | NMAGIC:
+ /*
+ * BSDI's NMAGIC format:
+ * same as NMAGIC format, but with different magic number
+ * and with text starting at 0.
+ */
+ return netbsd32_exec_aout_prep_oldnmagic(l, epp);
+
+ case (MID_ZERO << 16) | OMAGIC:
+ /*
+ * BSDI's OMAGIC format:
+ * same as OMAGIC format, but with different magic number
+ * and with text starting at 0.
+ */
+ return netbsd32_exec_aout_prep_oldomagic(l, epp);
+
+ default:
+ return ENOEXEC;
+ }
+
+ return error;
+}
+#endif
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