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Attempt to use i386_set_gsbase(), and gracefully fall back to LDT methods

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if the direct access methods are not implemented.
This commit is contained in:
Peter Wemm 2005-04-14 00:04:50 +00:00
parent 4453c6dc67
commit 8a477e0a7a
1 changed files with 16 additions and 13 deletions
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29
libexec/rtld-elf/i386/reloc.c
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@ -329,7 +329,7 @@ allocate_initial_tls(Obj_Entry *objs)
void* tls;
#ifndef COMPAT_32BIT
union descriptor ldt;
int sel;
int error, sel;
#endif
/*
@ -341,18 +341,21 @@ allocate_initial_tls(Obj_Entry *objs)
tls = allocate_tls(objs, NULL, 2*sizeof(Elf_Addr), sizeof(Elf_Addr));
#ifndef COMPAT_32BIT
memset(&ldt, 0, sizeof(ldt));
ldt.sd.sd_lolimit = 0xffff; /* 4G limit */
ldt.sd.sd_lobase = ((Elf_Addr)tls) & 0xffffff;
ldt.sd.sd_type = SDT_MEMRWA;
ldt.sd.sd_dpl = SEL_UPL;
ldt.sd.sd_p = 1; /* present */
ldt.sd.sd_hilimit = 0xf; /* 4G limit */
ldt.sd.sd_def32 = 1; /* 32 bit */
ldt.sd.sd_gran = 1; /* limit in pages */
ldt.sd.sd_hibase = (((Elf_Addr)tls) >> 24) & 0xff;
sel = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
__asm __volatile("movl %0,%%gs" : : "rm" ((sel << 3) | 7));
error = i386_set_gsbase(tls);
if (error) {
memset(&ldt, 0, sizeof(ldt));
ldt.sd.sd_lolimit = 0xffff; /* 4G limit */
ldt.sd.sd_lobase = ((Elf_Addr)tls) & 0xffffff;
ldt.sd.sd_type = SDT_MEMRWA;
ldt.sd.sd_dpl = SEL_UPL;
ldt.sd.sd_p = 1; /* present */
ldt.sd.sd_hilimit = 0xf; /* 4G limit */
ldt.sd.sd_def32 = 1; /* 32 bit */
ldt.sd.sd_gran = 1; /* limit in pages */
ldt.sd.sd_hibase = (((Elf_Addr)tls) >> 24) & 0xff;
sel = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
__asm __volatile("movl %0,%%gs" : : "rm" ((sel << 3) | 7));
}
#else
_amd64_set_gsbase(tls);
#endif