Author: jhb
Date: Tue May 23 22:34:18 2017
New Revision: 318761
URL: https://svnweb.freebsd.org/changeset/base/318761
Log:
Remove the BSD/OS 2.1 system call gate LDT entry.
An extra copy of the system call gate was added to the default LDT back
in 1996 (r18513 / r18514). However, the ability to run BSD/OS 2.1
i386 binaries under FreeBSD's native ABI is most likely no longer
needed.
Discussed with: kib
Modified:
head/sys/i386/i386/machdep.c
head/sys/x86/include/segments.h
Modified: head/sys/i386/i386/machdep.c
==============================================================================
--- head/sys/i386/i386/machdep.c Tue May 23 22:30:15 2017
(r318760)
+++ head/sys/i386/i386/machdep.c Tue May 23 22:34:18 2017
(r318761)
@@ -2446,10 +2446,6 @@ init386(int first)
gdp->gd_p = 1;
gdp->gd_hioffset = x >> 16;
- /* XXX does this work? */
- /* XXX yes! */
- ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
-
/* transfer to user mode */
_ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
Modified: head/sys/x86/include/segments.h
==============================================================================
--- head/sys/x86/include/segments.h Tue May 23 22:30:15 2017
(r318760)
+++ head/sys/x86/include/segments.h Tue May 23 22:34:18 2017
(r318761)
@@ -252,8 +252,7 @@ union descriptor {
#define LUDATA_SEL 5
/* separate stack, es,fs,gs sels ? */
/* #define LPOSIXCALLS_SEL 5*/ /* notyet */
-#define LBSDICALLS_SEL 16 /* BSDI system call gate */
-#define NLDT (LBSDICALLS_SEL + 1)
+#define NLDT (LUDATA_SEL + 1)
#else /* !__i386__ */
/*
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