81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*
|
|
* arm thread support
|
|
*
|
|
* Copyright (c) 2013 Stacey D. Son
|
|
*
|
|
* 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 to arm/arm/vm_machdep.c cpu_set_upcall_kse() */
|
|
static inline void target_thread_set_upcall(CPUARMState *env, abi_ulong entry,
|
|
abi_ulong arg, abi_ulong stack_base, abi_ulong stack_size)
|
|
{
|
|
abi_ulong sp;
|
|
|
|
/*
|
|
* Make sure the stack is properly aligned.
|
|
* arm/include/param.h (STACKLIGN() macro)
|
|
*/
|
|
sp = (u_int)(stack_base + stack_size) & ~0x7;
|
|
|
|
/* sp = stack base */
|
|
env->regs[13] = sp;
|
|
/* pc = start function entry */
|
|
env->regs[15] = entry & 0xfffffffe;
|
|
/* r0 = arg */
|
|
env->regs[0] = arg;
|
|
env->spsr = ARM_CPU_MODE_USR;
|
|
/*
|
|
* Thumb mode is encoded by the low bit in the entry point (since ARM can't
|
|
* execute at odd addresses). When it's set, set the Thumb bit (T) in the
|
|
* CPSR.
|
|
*/
|
|
cpsr_write(env, (entry & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr);
|
|
}
|
|
|
|
static inline void target_thread_init(struct target_pt_regs *regs,
|
|
struct image_info *infop)
|
|
{
|
|
abi_long stack = infop->start_stack;
|
|
memset(regs, 0, sizeof(*regs));
|
|
regs->ARM_cpsr = ARM_CPU_MODE_USR;
|
|
/*
|
|
* Thumb mode is encoded by the low bit in the entry point (since ARM can't
|
|
* execute at odd addresses). When it's set, set the Thumb bit (T) in the
|
|
* CPSR.
|
|
*/
|
|
if (infop->entry & 1) {
|
|
regs->ARM_cpsr |= CPSR_T;
|
|
}
|
|
regs->ARM_pc = infop->entry & 0xfffffffe;
|
|
regs->ARM_sp = stack;
|
|
regs->ARM_lr = infop->entry & 0xfffffffe;
|
|
/*
|
|
* FreeBSD kernel passes the ps_strings pointer in r0. This is used by some
|
|
* programs to set status messages that we see in ps. bsd-user doesn't
|
|
* support that functionality, so it's ignored. When set to 0, FreeBSD's csu
|
|
* code ignores it. For the static case, r1 and r2 are effectively ignored
|
|
* by the csu __startup() routine. For the dynamic case, rtld saves r0 but
|
|
* generates r1 and r2 and passes them into the csu _startup.
|
|
*
|
|
* r0 ps_strings 0 passed since ps arg setting not supported
|
|
* r1 obj_main ignored by _start(), so 0 passed
|
|
* r2 cleanup generated by rtld or ignored by _start(), so 0 passed
|
|
*/
|
|
}
|
|
|
|
#endif /* TARGET_ARCH_THREAD_H */
|