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ntdll: Improved implementation of the segv handler on ARM.

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This commit is contained in:
André Hentschel 2011-06-20 19:52:51 +02:00 committed by Alexandre Julliard
parent 71ae477493
commit de1d35eabc
1 changed files with 131 additions and 24 deletions
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155
dlls/ntdll/signal_arm.c
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@ -66,6 +66,8 @@ static pthread_key_t teb_key;
*/
#ifdef linux
typedef ucontext_t SIGCONTEXT;
/* All Registers access - only for local access */
# define REG_sig(reg_name, context) ((context)->uc_mcontext.reg_name)
# define REGn_sig(reg_num, context) ((context)->uc_mcontext.arm_r##reg_num)
@ -75,11 +77,25 @@ static pthread_key_t teb_key;
# define LR_sig(context) REG_sig(arm_lr, context) /* Link register */
# define PC_sig(context) REG_sig(arm_pc, context) /* Program counter */
# define CPSR_sig(context) REG_sig(arm_cpsr, context) /* Current State Register */
# define IP_sig(context) REG_sig(arm_ip, context) /* Program counter (2?) */
# define IP_sig(context) REG_sig(arm_ip, context) /* Intra-Procedure-call scratch register */
# define FP_sig(context) REG_sig(arm_fp, context) /* Frame pointer */
/* Exceptions */
# define ERROR_sig(context) REG_sig(error_code, context)
# define FAULT_sig(context) REG_sig(fault_address, context)
# define TRAP_sig(context) REG_sig(trap_no, context)
#endif /* linux */
enum arm_trap_code
{
TRAP_ARM_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
TRAP_ARM_PRIVINFLT = 6, /* Invalid opcode exception */
TRAP_ARM_PAGEFLT = 14, /* Page fault */
TRAP_ARM_ALIGNFLT = 17, /* Alignment check exception */
};
typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
typedef int (*wine_signal_handler)(unsigned int sig);
static wine_signal_handler handlers[256];
@ -206,11 +222,25 @@ __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
*
* Set the new CPU context.
*/
void set_cpu_context( const CONTEXT *context )
{
FIXME("not implemented\n");
return;
}
/* FIXME: What about the CPSR? */
__ASM_GLOBAL_FUNC( set_cpu_context,
"mov IP, r0\n\t"
"ldr r0, [IP, #0x4]\n\t" /* context->R0 */
"ldr r1, [IP, #0x8]\n\t" /* context->R1 */
"ldr r2, [IP, #0xc]\n\t" /* context->R2 */
"ldr r3, [IP, #0x10]\n\t" /* context->R3 */
"ldr r4, [IP, #0x14]\n\t" /* context->R4 */
"ldr r5, [IP, #0x18]\n\t" /* context->R5 */
"ldr r6, [IP, #0x1c]\n\t" /* context->R6 */
"ldr r7, [IP, #0x20]\n\t" /* context->R7 */
"ldr r8, [IP, #0x24]\n\t" /* context->R8 */
"ldr r9, [IP, #0x28]\n\t" /* context->R9 */
"ldr r10, [IP, #0x2c]\n\t" /* context->R10 */
"ldr r11, [IP, #0x30]\n\t" /* context->Fp */
"ldr SP, [IP, #0x38]\n\t" /* context->Sp */
"ldr LR, [IP, #0x3c]\n\t" /* context->Lr */
"ldr PC, [IP, #0x40]\n\t" /* context->Pc */
)
/***********************************************************************
@ -326,6 +356,63 @@ NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
return STATUS_SUCCESS;
}
/***********************************************************************
* setup_exception_record
*
* Setup the exception record and context on the thread stack.
*/
static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr, raise_func func )
{
struct stack_layout
{
CONTEXT context;
EXCEPTION_RECORD rec;
} *stack = stack_ptr;
DWORD exception_code = 0;
stack--; /* push the stack_layout structure */
stack->rec.ExceptionRecord = NULL;
stack->rec.ExceptionCode = exception_code;
stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
stack->rec.ExceptionAddress = (LPVOID)PC_sig(sigcontext);
stack->rec.NumberParameters = 0;
save_context( &stack->context, sigcontext );
/* now modify the sigcontext to return to the raise function */
SP_sig(sigcontext) = (DWORD)stack;
PC_sig(sigcontext) = (DWORD)func;
REGn_sig(0, sigcontext) = (DWORD)&stack->rec; /* first arg for raise_func */
REGn_sig(1, sigcontext) = (DWORD)&stack->context; /* second arg for raise_func */
return &stack->rec;
}
/**********************************************************************
* raise_segv_exception
*/
static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
switch(rec->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
{
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
rec->ExceptionInformation[0] )))
goto done;
}
break;
}
status = NtRaiseException( rec, context, TRUE );
if (status) raise_status( status, rec );
done:
set_cpu_context( context );
}
/**********************************************************************
* call_stack_handlers
@ -453,27 +540,47 @@ static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL f
*/
static void segv_handler( int signal, siginfo_t *info, void *ucontext )
{
EXCEPTION_RECORD rec;
CONTEXT context;
NTSTATUS status;
EXCEPTION_RECORD *rec;
SIGCONTEXT *context = ucontext;
void *stack = (void *) (SP_sig(context) & ~3);
rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
/* check for page fault inside the thread stack */
if (TRAP_sig(context) == TRAP_ARM_PAGEFLT &&
(char *)info->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
(char *)info->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
virtual_handle_stack_fault( info->si_addr ))
{
/* check if this was the last guard page */
if ((char *)info->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
{
rec = setup_exception_record( context, stack, raise_segv_exception );
rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
}
return;
}
/* we want the page-fault case to be fast */
if ( info->si_code == SEGV_ACCERR )
if (!(rec.ExceptionCode = virtual_handle_fault( info->si_addr, 0 ))) return;
rec = setup_exception_record( context, stack, raise_segv_exception );
if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
save_context( &context, ucontext );
rec.ExceptionRecord = NULL;
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionAddress = (LPVOID)context.Pc;
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = 0; /* FIXME: read/write access ? */
rec.ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
status = raise_exception( &rec, &context, TRUE );
if (status) raise_status( status, &rec );
restore_context( &context, ucontext );
switch(TRAP_sig(context))
{
case TRAP_ARM_PRIVINFLT: /* Invalid opcode exception */
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case TRAP_ARM_PAGEFLT: /* Page fault */
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = (ERROR_sig(context) & 0x800) != 0;
rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
break;
case TRAP_ARM_ALIGNFLT: /* Alignment check exception */
rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
WINE_ERR( "Got unexpected trap %ld\n", TRAP_sig(context) );
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
}
/**********************************************************************