#ifdef MACH_BSD
#include <mach_debug.h>
#include <mach_ldebug.h>
#include <mach/kern_return.h>
#include <mach/mach_traps.h>
#include <mach/vm_param.h>
#include <kern/counters.h>
#include <kern/cpu_data.h>
#include <arm/cpu_data_internal.h>
#include <kern/mach_param.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/misc_protos.h>
#include <kern/assert.h>
#include <kern/spl.h>
#include <kern/syscall_sw.h>
#include <ipc/ipc_port.h>
#include <vm/vm_kern.h>
#include <mach/thread_status.h>
#include <vm/pmap.h>
#include <sys/kdebug.h>
#include <sys/syscall.h>
extern void throttle_lowpri_io(int);
void mach_syscall(struct arm_saved_state*);
typedef kern_return_t (*mach_call_t)(void *);
struct mach_call_args {
syscall_arg_t arg1;
syscall_arg_t arg2;
syscall_arg_t arg3;
syscall_arg_t arg4;
syscall_arg_t arg5;
syscall_arg_t arg6;
syscall_arg_t arg7;
syscall_arg_t arg8;
syscall_arg_t arg9;
};
static void
arm_set_mach_syscall_ret(struct arm_saved_state *state, int retval)
{
if (is_saved_state32(state)) {
saved_state32(state)->r[0] = retval;
} else {
saved_state64(state)->x[0] = retval;
}
}
static kern_return_t
arm_get_mach_syscall_args(struct arm_saved_state *state, struct mach_call_args *dest, const mach_trap_t *trapp)
{
uint32_t reg_count;
if (is_saved_state32(state)) {
reg_count = trapp->mach_trap_u32_words;
if (reg_count <= 7) {
bcopy((char*)saved_state32(state), (char*)dest, sizeof(uint32_t) * reg_count);
} else if (reg_count <= 9) {
bcopy((char*)saved_state32(state), (char*)dest, sizeof(uint32_t) * 7);
bcopy((char*)&saved_state32(state)->r[8], ((char*)dest) + sizeof(uint32_t) * 7,
reg_count - 7);
} else {
panic("Trap with %d words of args? We only support 9.", reg_count);
}
#if CONFIG_REQUIRES_U32_MUNGING
trapp->mach_trap_arg_munge32(dest);
#else
#error U32 mach traps on ARM64 kernel requires munging
#endif
} else {
assert(is_saved_state64(state));
bcopy((char*)saved_state64(state), (char*)dest, trapp->mach_trap_arg_count * sizeof(uint64_t));
}
return KERN_SUCCESS;
}
kern_return_t
thread_setsinglestep(__unused thread_t thread, __unused int on)
{
return (KERN_FAILURE);
}
#if CONFIG_DTRACE
vm_offset_t dtrace_get_cpu_int_stack_top(void);
vm_offset_t
dtrace_get_cpu_int_stack_top(void)
{
return getCpuDatap()->intstack_top;
}
#endif
extern const char *mach_syscall_name_table[];
extern struct proc* current_proc(void);
extern int proc_pid(struct proc*);
void
mach_syscall(struct arm_saved_state *state)
{
kern_return_t retval;
mach_call_t mach_call;
struct mach_call_args args = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
int call_number = get_saved_state_svc_number(state);
int64_t exc_code;
int argc;
struct uthread *ut = get_bsdthread_info(current_thread());
uthread_reset_proc_refcount(ut);
assert(call_number < 0);
call_number = -call_number;
if (call_number >= MACH_TRAP_TABLE_COUNT) {
goto bad;
}
DEBUG_KPRINT_SYSCALL_MACH(
"mach_syscall: code=%d(%s) (pid %d, tid %lld)\n",
call_number, mach_syscall_name_table[call_number],
proc_pid(current_proc()), thread_tid(current_thread()));
#if DEBUG_TRACE
kprintf("mach_syscall(0x%08x) code=%d\n", state, call_number);
#endif
mach_call = (mach_call_t)mach_trap_table[call_number].mach_trap_function;
if (mach_call == (mach_call_t)kern_invalid) {
DEBUG_KPRINT_SYSCALL_MACH(
"mach_syscall: kern_invalid 0x%x\n", call_number);
goto bad;
}
argc = mach_trap_table[call_number].mach_trap_arg_count;
if (argc) {
retval = arm_get_mach_syscall_args(state, &args, &mach_trap_table[call_number]);
if (retval != KERN_SUCCESS) {
arm_set_mach_syscall_ret(state, retval);
DEBUG_KPRINT_SYSCALL_MACH(
"mach_syscall: retval=0x%x\n", retval);
return;
}
}
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC, (call_number)) | DBG_FUNC_START,
args.arg1, args.arg2, args.arg3, args.arg4, 0);
retval = mach_call(&args);
DEBUG_KPRINT_SYSCALL_MACH("mach_syscall: retval=0x%x (pid %d, tid %lld)\n", retval,
proc_pid(current_proc()), thread_tid(current_thread()));
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC,(call_number)) | DBG_FUNC_END,
retval, 0, 0, 0, 0);
arm_set_mach_syscall_ret(state, retval);
throttle_lowpri_io(1);
#if DEBUG || DEVELOPMENT
kern_allocation_name_t
prior __assert_only = thread_get_kernel_state(current_thread())->allocation_name;
assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
#endif
#if PROC_REF_DEBUG
if (__improbable(uthread_get_proc_refcount(ut) != 0)) {
panic("system call returned with uu_proc_refcount != 0");
}
#endif
return;
bad:
exc_code = call_number;
exception_triage(EXC_SYSCALL, &exc_code, 1);
panic("Returned from exception_triage()?\n");
}
#endif