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bsd-user: Add RISC-V thread setup and initialization support 

Implemented functions for setting up and initializing threads in the
RISC-V architecture.
The 'target_thread_set_upcall' function sets up the stack pointer,
program counter, and function argument for new threads.
The 'target_thread_init' function initializes thread registers based on
the provided image information.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Jessica Clarke <jrtc27@jrtc27.com>
Co-authored-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240916155119.14610-10-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Mark Corbin 2024-09-17 01:51:11 +10:00 committed by Alistair Francis
parent 207e80c940
commit 9aae5dcd04
1 changed files with 47 additions and 0 deletions
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47
bsd-user/riscv/target_arch_thread.h Normal file
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/*
* RISC-V thread support
*
* Copyright (c) 2019 Mark Corbin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TARGET_ARCH_THREAD_H
#define TARGET_ARCH_THREAD_H
/* Compare with cpu_set_upcall() in riscv/riscv/vm_machdep.c */
static inline void target_thread_set_upcall(CPURISCVState *regs,
abi_ulong entry, abi_ulong arg, abi_ulong stack_base,
abi_ulong stack_size)
{
abi_ulong sp;
sp = ROUND_DOWN(stack_base + stack_size, 16);
regs->gpr[xSP] = sp;
regs->pc = entry;
regs->gpr[xA0] = arg;
}
/* Compare with exec_setregs() in riscv/riscv/machdep.c */
static inline void target_thread_init(struct target_pt_regs *regs,
struct image_info *infop)
{
regs->sepc = infop->entry;
regs->regs[xRA] = infop->entry;
regs->regs[xA0] = infop->start_stack;
regs->regs[xSP] = ROUND_DOWN(infop->start_stack, 16);
}
#endif /* TARGET_ARCH_THREAD_H */