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Implement ARM magic kernel page and TLS register.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4610 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-05-29 00:20:44 +00:00
parent ce5232c5c2
commit fbb4a2e371
4 changed files with 96 additions and 10 deletions
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4
linux-user/arm/syscall.h
View File

@ -28,7 +28,9 @@ struct target_pt_regs {
#define ARM_SYSCALL_BASE 0x900000
#define ARM_THUMB_SYSCALL 0
#define ARM_NR_cacheflush (ARM_SYSCALL_BASE + 0xf0000 + 2)
#define ARM_NR_BASE 0xf0000
#define ARM_NR_cacheflush (ARM_NR_BASE + 2)
#define ARM_NR_set_tls (ARM_NR_BASE + 5)
#define ARM_NR_semihosting 0x123456
#define ARM_NR_thumb_semihosting 0xAB

86
linux-user/main.c
View File

@ -365,6 +365,55 @@ static void arm_cache_flush(abi_ulong start, abi_ulong last)
}
}
/* Handle a jump to the kernel code page. */
static int
do_kernel_trap(CPUARMState *env)
{
uint32_t addr;
uint32_t cpsr;
uint32_t val;
switch (env->regs[15]) {
case 0xffff0fa0: /* __kernel_memory_barrier */
/* ??? No-op. Will need to do better for SMP. */
break;
case 0xffff0fc0: /* __kernel_cmpxchg */
/* ??? This is not really atomic. However we don't support
threads anyway, so it doesn't realy matter. */
cpsr = cpsr_read(env);
addr = env->regs[2];
/* FIXME: This should SEGV if the access fails. */
if (get_user_u32(val, addr))
val = ~env->regs[0];
if (val == env->regs[0]) {
val = env->regs[1];
/* FIXME: Check for segfaults. */
put_user_u32(val, addr);
env->regs[0] = 0;
cpsr |= CPSR_C;
} else {
env->regs[0] = -1;
cpsr &= ~CPSR_C;
}
cpsr_write(env, cpsr, CPSR_C);
break;
case 0xffff0fe0: /* __kernel_get_tls */
env->regs[0] = env->cp15.c13_tls2;
break;
default:
return 1;
}
/* Jump back to the caller. */
addr = env->regs[14];
if (addr & 1) {
env->thumb = 1;
addr &= ~1;
}
env->regs[15] = addr;
return 0;
}
void cpu_loop(CPUARMState *env)
{
int trapnr;
@ -489,14 +538,31 @@ void cpu_loop(CPUARMState *env)
n -= ARM_SYSCALL_BASE;
env->eabi = 0;
}
env->regs[0] = do_syscall(env,
n,
env->regs[0],
env->regs[1],
env->regs[2],
env->regs[3],
env->regs[4],
env->regs[5]);
if ( n > ARM_NR_BASE) {
switch (n) {
case ARM_NR_cacheflush:
arm_cache_flush(env->regs[0], env->regs[1]);
break;
case ARM_NR_set_tls:
cpu_set_tls(env, env->regs[0]);
env->regs[0] = 0;
break;
default:
gemu_log("qemu: Unsupported ARM syscall: 0x%x\n",
n);
env->regs[0] = -TARGET_ENOSYS;
break;
}
} else {
env->regs[0] = do_syscall(env,
n,
env->regs[0],
env->regs[1],
env->regs[2],
env->regs[3],
env->regs[4],
env->regs[5]);
}
} else {
goto error;
}
@ -535,6 +601,10 @@ void cpu_loop(CPUARMState *env)
}
}
break;
case EXCP_KERNEL_TRAP:
if (do_kernel_trap(env))
goto error;
break;
default:
error:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",

5
target-arm/cpu.h
View File

@ -38,6 +38,7 @@
#define EXCP_FIQ 6
#define EXCP_BKPT 7
#define EXCP_EXCEPTION_EXIT 8 /* Return from v7M exception. */
#define EXCP_KERNEL_TRAP 9 /* Jumped to kernel code page. */
#define ARMV7M_EXCP_RESET 1
#define ARMV7M_EXCP_NMI 2
@ -216,6 +217,10 @@ int cpu_arm_signal_handler(int host_signum, void *pinfo,
void cpu_lock(void);
void cpu_unlock(void);
static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
{
env->cp15.c13_tls2 = newtls;
}
#define CPSR_M (0x1f)
#define CPSR_T (1 << 5)

11
target-arm/translate.c
View File

@ -8583,7 +8583,16 @@ static inline int gen_intermediate_code_internal(CPUState *env,
store_cpu_field(tmp, condexec_bits);
}
do {
#ifndef CONFIG_USER_ONLY
#ifdef CONFIG_USER_ONLY
/* Intercept jump to the magic kernel page. */
if (dc->pc >= 0xffff0000) {
/* We always get here via a jump, so know we are not in a
conditional execution block. */
gen_exception(EXCP_KERNEL_TRAP);
dc->is_jmp = DISAS_UPDATE;
break;
}
#else
if (dc->pc >= 0xfffffff0 && IS_M(env)) {
/* We always get here via a jump, so know we are not in a
conditional execution block. */