On Fri, Aug 2, 2024 at 7:30 AM Richard Henderson < richard.hender...@linaro.org> wrote:
> On 8/2/24 18:34, Ajeet Singh wrote: > > From: Mark Corbin <mark.cor...@embecsom.com> > > > > 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.cor...@embecsom.com> > > Signed-off-by: Ajeet Singh <itac...@freebsd.org> > > Co-authored-by: Jessica Clarke <jrt...@jrtc27.com> > > Co-authored-by: Kyle Evans <kev...@freebsd.org> > > --- > > bsd-user/riscv/target_arch_thread.h | 47 +++++++++++++++++++++++++++++ > > 1 file changed, 47 insertions(+) > > create mode 100644 bsd-user/riscv/target_arch_thread.h > > > > diff --git a/bsd-user/riscv/target_arch_thread.h > b/bsd-user/riscv/target_arch_thread.h > > new file mode 100644 > > index 0000000000..faabb9fb45 > > --- /dev/null > > +++ b/bsd-user/riscv/target_arch_thread.h > > @@ -0,0 +1,47 @@ > > +/* > > + * 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 = (abi_ulong)(stack_base + stack_size) & ~(16 - 1); > > + > > + regs->gpr[xSP] = sp; > > + regs->pc = entry; > > + regs->gpr[xA0] = arg; > > +} > > + > > +/* Compare with exec_setregs() in riscv/riscv/machdep.c */ > > exec_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[10] = infop->start_stack; /* a0 */ > > xA0 > > > + regs->regs[xSP] = infop->start_stack & ~(16 - 1); > > ROUND_DOWN. > Oh, I should do a pass through our tree for rounding like this to add this macro. Warner > > r~ >