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