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bsd-user: introduce target.h 

Create target.h. This file is intended to be simple and describe basic
things about the architecture. If something is a basic feature of the
architecture, it belongs here. Should we need something that's per-BSD
there will be a target-os.h that will live in the per-bsd directories.

Define regpairs_aligned to reflect whether or not registers are 'paired'
for 64-bit arguments or not. This will be false for all 64-bit targets,
and will be true on those architectures that pair (currently just armv7
and powerpc on FreeBSD 14.x).

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-31 16:01:05 -07:00
parent c5c84d1651
commit 647afdf183
4 changed files with 64 additions and 0 deletions
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21
bsd-user/arm/target.h Normal file
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@ -0,0 +1,21 @@
/*
* Intel general target stuff that's common to all i386 details
*
* Copyright (c) 2022 M. Warner Losh <imp@bsdimp.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef TARGET_H
#define TARGET_H
/*
* arm EABI 'lumps' the registers for 64-bit args.
*/
static inline bool regpairs_aligned(void *cpu_env)
{
return true;
}
#endif /* ! TARGET_H */

21
bsd-user/i386/target.h Normal file
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@ -0,0 +1,21 @@
/*
* Intel general target stuff that's common to all i386 details
*
* Copyright (c) 2022 M. Warner Losh <imp@bsdimp.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef TARGET_ARCH_H
#define TARGET_ARCH_H
/*
* i386 doesn't 'lump' the registers for 64-bit args.
*/
static inline bool regpairs_aligned(void *cpu_env)
{
return false;
}
#endif /* ! TARGET_ARCH_H */

1
bsd-user/qemu.h
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@ -35,6 +35,7 @@ extern char **environ;
#include "target_syscall.h"
#include "target_os_vmparam.h"
#include "target_os_signal.h"
#include "target.h"
#include "exec/gdbstub.h"
/*

21
bsd-user/x86_64/target.h Normal file
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@ -0,0 +1,21 @@
/*
* Intel general target stuff that's common to all x86_64 details
*
* Copyright (c) 2022 M. Warner Losh <imp@bsdimp.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef TARGET_H
#define TARGET_H
/*
* x86 doesn't 'lump' the registers for 64-bit args, all args are 64 bits.
*/
static inline bool regpairs_aligned(void *cpu_env)
{
return false;
}
#endif /* ! TARGET_H */