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Adapt the libpthread patch for using i386_set_gsbase() to libthr.

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This commit is contained in:
Peter Wemm 2005-04-14 00:44:07 +00:00
parent 72a79166ea
commit c050415d18
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145040
2 changed files with 41 additions and 16 deletions
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47
lib/libthr/arch/i386/i386/pthread_md.c
View File

@ -35,14 +35,18 @@
#include "pthread_md.h"
int _thr_using_setbase;
struct tcb *
_tcb_ctor(struct pthread *thread, int initial)
{
#ifndef COMPAT_32BIT
union descriptor ldt;
void *base;
#endif
struct tcb *tcb;
void *oldtls;
int error;
if (initial)
__asm __volatile("movl %%gs:0, %0" : "=r" (oldtls));
@ -53,20 +57,35 @@ _tcb_ctor(struct pthread *thread, int initial)
if (tcb) {
tcb->tcb_thread = thread;
#ifndef COMPAT_32BIT
ldt.sd.sd_hibase = (unsigned int)tcb >> 24;
ldt.sd.sd_lobase = (unsigned int)tcb & 0xFFFFFF;
ldt.sd.sd_hilimit = (sizeof(struct tcb) >> 16) & 0xF;
ldt.sd.sd_lolimit = sizeof(struct tcb) & 0xFFFF;
ldt.sd.sd_type = SDT_MEMRWA;
ldt.sd.sd_dpl = SEL_UPL;
ldt.sd.sd_p = 1;
ldt.sd.sd_xx = 0;
ldt.sd.sd_def32 = 1;
ldt.sd.sd_gran = 0; /* no more than 1M */
tcb->tcb_ldt = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
if (tcb->tcb_ldt < 0) {
_rtld_free_tls(tcb, sizeof(struct tcb), 16);
tcb = NULL;
tcb->tcb_ldt = -1;
switch (_thr_using_setbase) {
case 1: /* use i386_set_gsbase() in _kcb_set */
break;
case 0: /* Untested, try the get/set_gsbase routines once */
error = i386_get_gsbase(&base);
if (error == 0) {
_thr_using_setbase = 1;
break;
}
/* fall through */
case 2: /* Use the user_ldt code, we must have an old kernel */
_thr_using_setbase = 2;
ldt.sd.sd_hibase = (unsigned int)tcb >> 24;
ldt.sd.sd_lobase = (unsigned int)tcb & 0xFFFFFF;
ldt.sd.sd_hilimit = (sizeof(struct tcb) >> 16) & 0xF;
ldt.sd.sd_lolimit = sizeof(struct tcb) & 0xFFFF;
ldt.sd.sd_type = SDT_MEMRWA;
ldt.sd.sd_dpl = SEL_UPL;
ldt.sd.sd_p = 1;
ldt.sd.sd_xx = 0;
ldt.sd.sd_def32 = 1;
ldt.sd.sd_gran = 0; /* no more than 1M */
tcb->tcb_ldt = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
if (tcb->tcb_ldt < 0) {
_rtld_free_tls(tcb, sizeof(struct tcb), 16);
tcb = NULL;
}
break;
}
#endif
}

10
lib/libthr/arch/i386/include/pthread_md.h
View File

@ -39,6 +39,8 @@
#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
extern int _thr_using_setbase;
/*
* Variant II tcb, first two members are required by rtld,
* %gs points to the structure.
@ -88,8 +90,12 @@ _tcb_set(struct tcb *tcb)
#ifndef COMPAT_32BIT
int val;
val = (tcb->tcb_ldt << 3) | 7;
__asm __volatile("movl %0, %%gs" : : "r" (val));
if (_thr_using_setbase == 1) {
i386_set_gsbase(tcb);
} else {
val = (tcb->tcb_ldt << 3) | 7;
__asm __volatile("movl %0, %%gs" : : "r" (val));
}
#else
_amd64_set_gsbase(tcb);
#endif