82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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/*
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* arm thread support
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*
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* Copyright (c) 2013 Stacey D. Son
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TARGET_ARCH_THREAD_H
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#define TARGET_ARCH_THREAD_H
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/* Compare to arm/arm/vm_machdep.c cpu_set_upcall_kse() */
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static inline void target_thread_set_upcall(CPUARMState *env, abi_ulong entry,
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abi_ulong arg, abi_ulong stack_base, abi_ulong stack_size)
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{
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abi_ulong sp;
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/*
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* Make sure the stack is properly aligned.
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* arm/include/param.h (STACKLIGN() macro)
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*/
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sp = (u_int)(stack_base + stack_size) & ~0x7;
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/* sp = stack base */
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env->regs[13] = sp;
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/* pc = start function entry */
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env->regs[15] = entry & 0xfffffffe;
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/* r0 = arg */
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env->regs[0] = arg;
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env->spsr = ARM_CPU_MODE_USR;
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/*
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* Thumb mode is encoded by the low bit in the entry point (since ARM can't
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* execute at odd addresses). When it's set, set the Thumb bit (T) in the
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* CPSR.
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*/
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cpsr_write(env, (entry & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr);
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}
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static inline void target_thread_init(struct target_pt_regs *regs,
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struct image_info *infop)
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{
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abi_long stack = infop->start_stack;
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memset(regs, 0, sizeof(*regs));
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regs->ARM_cpsr = ARM_CPU_MODE_USR;
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/*
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* Thumb mode is encoded by the low bit in the entry point (since ARM can't
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* execute at odd addresses). When it's set, set the Thumb bit (T) in the
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* CPSR.
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*/
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if (infop->entry & 1) {
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regs->ARM_cpsr |= CPSR_T;
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}
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regs->ARM_pc = infop->entry & 0xfffffffe;
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regs->ARM_sp = stack;
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regs->ARM_lr = infop->entry & 0xfffffffe;
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/*
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* FreeBSD kernel passes the ps_strings pointer in r0. This is used by some
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* programs to set status messages that we see in ps. bsd-user doesn't
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* support that functionality, so it's ignored. When set to 0, FreeBSD's csu
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* code ignores it. For the static case, r1 and r2 are effectively ignored
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* by the csu __startup() routine. For the dynamic case, rtld saves r0 but
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* generates r1 and r2 and passes them into the csu _startup.
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*
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* r0 ps_strings 0 passed since ps arg setting not supported
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* r1 obj_main ignored by _start(), so 0 passed
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* r2 cleanup generated by rtld or ignored by _start(), so 0 passed
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*/
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}
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#endif /* TARGET_ARCH_THREAD_H */
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