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bsd-user:Add AArch64 register handling and related functions

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Added header file for managing CPU register states in FreeBSD user mode.
Introduced prototypes for setting and getting thread-local storage (TLS).
Implemented AArch64 sysarch() system call emulation and a printing function.
Added function for setting up thread upcall to add thread support to BSD-USER.
Initialized thread's register state during thread setup.
Updated ARM AArch64 VM parameter definitions for bsd-user, including address spaces for FreeBSD/arm64 and
a function for getting the stack pointer from CPU and setting a return value.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Jessica Clarke <jrtc27@jrtc27.com>
Co-authored-by: Sean Bruno <sbruno@freebsd.org>
Co-authored-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-3-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
This commit is contained in:
Stacey Son 2024-07-08 00:41:22 +05:30 • committed by Warner Losh
parent 8cbb4fc12e
commit 1acce7718b
5 changed files with 255 additions and 0 deletions
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61
bsd-user/aarch64/target_arch_thread.h Normal file
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/*
* ARM AArch64 thread support for bsd-user.
*
* Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
*
* 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/>.
*/
#ifndef TARGET_ARCH_THREAD_H
#define TARGET_ARCH_THREAD_H
/* Compare to arm64/arm64/vm_machdep.c cpu_set_upcall_kse() */
static inline void target_thread_set_upcall(CPUARMState *regs, abi_ulong entry,
abi_ulong arg, abi_ulong stack_base, abi_ulong stack_size)
{
abi_ulong sp;
/*
* Make sure the stack is properly aligned.
* arm64/include/param.h (STACKLIGN() macro)
*/
sp = ROUND_DOWN(stack_base + stack_size, 16);
/* sp = stack base */
regs->xregs[31] = sp;
/* pc = start function entry */
regs->pc = entry;
/* r0 = arg */
regs->xregs[0] = arg;
}
static inline void target_thread_init(struct target_pt_regs *regs,
struct image_info *infop)
{
abi_long stack = infop->start_stack;
/*
* Make sure the stack is properly aligned.
* arm64/include/param.h (STACKLIGN() macro)
*/
memset(regs, 0, sizeof(*regs));
regs->regs[0] = infop->start_stack;
regs->pc = infop->entry;
regs->sp = ROUND_DOWN(stack, 16);
}
#endif /* TARGET_ARCH_THREAD_H */