Update.
1999-01-28 David S. Miller <davem@redhat.com> * sysdeps/sparc/sparc32/__longjmp.S: Rewrite without bogus sanity checks and aborts, to make longjmp based thread schemes work again.
This commit is contained in:
Ulrich Drepper
parent
1f749a3ba2
commit
8163845fda
@ -1,3 +1,8 @@
|
||||
1999-01-28 David S. Miller <davem@redhat.com>
|
||||
|
||||
* sysdeps/sparc/sparc32/__longjmp.S: Rewrite without bogus sanity
|
||||
checks and aborts, to make longjmp based thread schemes work again.
|
||||
|
||||
1999-01-28 Ulrich Drepper <drepper@cygnus.com>
|
||||
|
||||
* sysdeps/unix/sysv/sysv4/solaris2/configure.in: New file.
|
||||
|
||||
@ -140,18 +140,17 @@ bits wide and so a de-factor standard required 32 bit variables. This
|
||||
is important since references to variables of this type are passed to
|
||||
the kernel.
|
||||
|
||||
But now the POSIX people came and unified the interface with their words
|
||||
But then the POSIX people came and unified the interface with the words
|
||||
"all size values are of type @code{size_t}". But on 64 bit machines
|
||||
@code{size_t} is 64 bits wide and so variable references are not anymore
|
||||
@code{size_t} is 64 bits wide, and so variable references are not anymore
|
||||
possible.
|
||||
|
||||
A solution is provided by the Unix98 specification which finally
|
||||
introduces a type @code{socklen_t}. This type is used in all of the
|
||||
cases that were previously changed to use @code{size_t}. The only
|
||||
requirement of this type is that it is an unsigned type of at least 32
|
||||
bits. Therefore, implementations which require references to 32 bit
|
||||
variables be passed can be as happy as implementations which use right
|
||||
from the start 64 bit values.
|
||||
The Unix98 specification provides a solution by introducing a type
|
||||
@code{socklen_t}. This type is used in all of the cases that POSIX
|
||||
changed to use @code{size_t}. The only requirement of this type is that
|
||||
it be an unsigned type of at least 32 bits. Therefore, implementations
|
||||
which require that references to 32 bit variables be passed can be as
|
||||
happy as implementations which use 64 bit values.
|
||||
|
||||
|
||||
@node Communication Styles
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.
|
||||
/* Copyright (C) 1991, 93, 96, 97, 98, 99 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
@ -19,20 +19,27 @@
|
||||
#include <sysdep.h>
|
||||
|
||||
#define _ASM 1
|
||||
#define _SETJMP_H
|
||||
#include <bits/setjmp.h>
|
||||
#define ENV(reg) [%g1 + (reg * 4)]
|
||||
#include <jmp_buf.h>
|
||||
#define ENV(base,reg) [%base + (reg * 4)]
|
||||
#define ST_FLUSH_WINDOWS 3
|
||||
#define RW_FP [%fp + 0x38]
|
||||
|
||||
ENTRY(__longjmp)
|
||||
/* Store our arguments in global registers so we can still
|
||||
use them while unwinding frames and their register windows. */
|
||||
|
||||
ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */
|
||||
mov %o0, %g1 /* ENV in %g1 */
|
||||
orcc %o1, %g0, %g2 /* VAL in %g2 */
|
||||
be,a 0f /* Branch if zero; else skip delay slot. */
|
||||
mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */
|
||||
0:
|
||||
/* Cache target FP in register %g3. */
|
||||
ld ENV(JB_FP), %g3
|
||||
xor %fp, %g3, %o0
|
||||
add %fp, 512, %o1
|
||||
andncc %o0, 4095, %o0
|
||||
bne LOC(thread)
|
||||
cmp %o1, %g3
|
||||
bl LOC(thread)
|
||||
|
||||
/* Now we will loop, unwinding the register windows up the stack
|
||||
until the restored %fp value matches the target value in %g3. */
|
||||
@ -42,23 +49,31 @@ LOC(loop):
|
||||
bl,a LOC(loop) /* Loop while current fp is below target. */
|
||||
restore /* Unwind register window in delay slot. */
|
||||
be,a LOC(found) /* Better have hit it exactly. */
|
||||
ld ENV(JB_SP), %o0 /* Delay slot: extract target SP. */
|
||||
ld ENV(g1,JB_SP), %o0 /* Delay slot: extract target SP. */
|
||||
|
||||
LOC(bogus):
|
||||
/* Get here only if the jmp_buf or stack is clobbered. */
|
||||
call C_SYMBOL_NAME(abort)
|
||||
nop
|
||||
unimp 0
|
||||
LOC(thread):
|
||||
/*
|
||||
* Do a "flush register windows trap". The trap handler in the
|
||||
* kernel writes all the register windows to their stack slots, and
|
||||
* marks them all as invalid (needing to be sucked up from the
|
||||
* stack when used). This ensures that all information needed to
|
||||
* unwind to these callers is in memory, not in the register
|
||||
* windows.
|
||||
*/
|
||||
ta ST_FLUSH_WINDOWS
|
||||
ld ENV(g1,JB_PC), %o7 /* Set return PC. */
|
||||
ld ENV(g1,JB_SP), %fp /* Set saved SP on restore below. */
|
||||
sub %fp, 64, %sp /* Allocate a register frame. */
|
||||
st %g3, RW_FP /* Set saved FP on restore below. */
|
||||
retl
|
||||
restore %g2, 0, %o0 /* Restore values from above register frame. */
|
||||
|
||||
LOC(found):
|
||||
/* We have unwound register windows so %fp matches the target. */
|
||||
cmp %o0, %sp /* Check jmp_buf SP vs register window. */
|
||||
bge,a LOC(sp_ok) /* Saved must not be deeper than register. */
|
||||
mov %o0, %sp /* OK, install new SP. */
|
||||
b,a LOC(bogus) /* Bogus, we lose. */
|
||||
mov %o0, %sp /* OK, install new SP. */
|
||||
|
||||
LOC(sp_ok):
|
||||
ld ENV(JB_PC), %o0 /* Extract target return PC. */
|
||||
ld ENV(g1,JB_PC), %o0 /* Extract target return PC. */
|
||||
jmp %o0 + 8 /* Return there. */
|
||||
mov %g2, %o0 /* Delay slot: set return value. */
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user