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get rid of hostregs_helper.h 

Since b567b38 (target-arm: remove T0 and T1, 2009-10-16) the only global
register that is used is AREG0, so the complexity of hostregs_helper.h
is unused.  Use regular assignments and a compiler optimization barrier.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Paolo Bonzini 2010-02-18 21:25:23 +01:00 committed by Blue Swirl
parent df2a54e698
commit 24ebf5f31a
3 changed files with 11 additions and 67 deletions
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15
cpu-exec.c
View File

@ -210,8 +210,7 @@ static void cpu_handle_debug_exception(CPUState *env)
int cpu_exec(CPUState *env1)
{
#define DECLARE_HOST_REGS 1
#include "hostregs_helper.h"
host_reg_t saved_env_reg;
int ret, interrupt_request;
TranslationBlock *tb;
uint8_t *tc_ptr;
@ -222,9 +221,12 @@ int cpu_exec(CPUState *env1)
cpu_single_env = env1;
/* first we save global registers */
#define SAVE_HOST_REGS 1
#include "hostregs_helper.h"
/* the access to env below is actually saving the global register's
value, so that files not including target-xyz/exec.h are free to
use it. */
QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
saved_env_reg = (host_reg_t) env;
asm("");
env = env1;
#if defined(TARGET_I386)
@ -669,7 +671,8 @@ int cpu_exec(CPUState *env1)
#endif
/* restore global registers */
#include "hostregs_helper.h"
asm("");
env = (void *) saved_env_reg;
/* fail safe : never use cpu_single_env outside cpu_exec() */
cpu_single_env = NULL;

61
hostregs_helper.h
View File

@ -1,61 +0,0 @@
/*
* Save/restore host registers.
*
* Copyright (c) 2007 CodeSourcery
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/* The GCC global register variable extension is used to reserve some
host registers for use by generated code. However only the core parts of
the translation engine are compiled with these settings. We must manually
save/restore these registers when called from regular code.
It is not sufficient to save/restore T0 et. al. as these may be declared
with a datatype smaller than the actual register. */
#if defined(DECLARE_HOST_REGS)
#define DO_REG(REG) \
register host_reg_t reg_AREG##REG asm(AREG##REG); \
volatile host_reg_t saved_AREG##REG;
#elif defined(SAVE_HOST_REGS)
#define DO_REG(REG) \
__asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \
saved_AREG##REG = reg_AREG##REG;
#else
#define DO_REG(REG) \
reg_AREG##REG = saved_AREG##REG; \
__asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
#endif
#ifdef AREG0
DO_REG(0)
#endif
#ifdef AREG1
DO_REG(1)
#endif
#ifdef AREG2
DO_REG(2)
#endif
#undef SAVE_HOST_REGS
#undef DECLARE_HOST_REGS
#undef DO_REG

2
qemu-common.h
View File

@ -11,6 +11,8 @@
#define QEMU_WARN_UNUSED_RESULT
#endif
#define QEMU_BUILD_BUG_ON(x) typedef char __build_bug_on__##__LINE__[(x)?-1:1];
/* Hack around the mess dyngen-exec.h causes: We need QEMU_NORETURN in files that
cannot include the following headers without conflicts. This condition has
to be removed once dyngen is gone. */