+
+/*
+ * i386_saved_state:
+ *
+ * Has been exported to servers. See: mach/i386/thread_status.h
+ *
+ * This structure corresponds to the state of user registers
+ * as saved upon kernel entry. It lives in the pcb.
+ * It is also pushed onto the stack for exceptions in the kernel.
+ * For performance, it is also used directly in syscall exceptions
+ * if the server has requested i386_THREAD_STATE flavor for the exception
+ * port.
+ *
+ * We define the following as an alias for the "esp" field of the
+ * structure, because we actually save cr2 here, not the kernel esp.
+ */
+#define cr2 esp
+
+/*
+ * Save area for user floating-point state.
+ * Allocated only when necessary.
+ */
+
+struct i386_fpsave_state {
+ boolean_t fp_valid;
+ struct i386_fp_save fp_save_state;
+ struct i386_fp_regs fp_regs;
+ struct i386_fx_save fx_save_state __attribute__ ((aligned (16)));
+ int fp_save_flavor;
+};
+
+/*
+ * v86_assist_state:
+ *
+ * This structure provides data to simulate 8086 mode
+ * interrupts. It lives in the pcb.
+ */
+
+struct v86_assist_state {
+ vm_offset_t int_table;
+ unsigned short int_count;
+ unsigned short flags; /* 8086 flag bits */
+};
+#define V86_IF_PENDING 0x8000 /* unused bit */
+
+/*
+ * i386_interrupt_state:
+ *
+ * This structure describes the set of registers that must
+ * be pushed on the current ring-0 stack by an interrupt before
+ * we can switch to the interrupt stack.
+ */
+
+struct i386_interrupt_state {
+ int gs;
+ int fs;
+ int es;
+ int ds;
+ int edx;
+ int ecx;
+ int eax;
+ int eip;
+ int cs;
+ int efl;
+};
+
+/*
+ * i386_kernel_state:
+ *
+ * This structure corresponds to the state of kernel registers
+ * as saved in a context-switch. It lives at the base of the stack.
+ */
+
+struct i386_kernel_state {
+ int k_ebx; /* kernel context */
+ int k_esp;
+ int k_ebp;
+ int k_edi;
+ int k_esi;
+ int k_eip;
+};
+
+/*
+ * i386_machine_state:
+ *
+ * This structure corresponds to special machine state.
+ * It lives in the pcb. It is not saved by default.
+ */
+
+struct i386_machine_state {
+ iopb_tss_t io_tss;
+ struct user_ldt * ldt;
+ struct i386_fpsave_state *ifps;
+ struct v86_assist_state v86s;
+};
+
+typedef struct pcb {
+ struct i386_interrupt_state iis[2]; /* interrupt and NMI */
+ struct i386_saved_state iss;
+ struct i386_machine_state ims;
+#ifdef MACH_BSD
+ unsigned long cthread_self; /* for use of cthread package */
+ struct real_descriptor cthread_desc;
+ unsigned long uldt_selector; /* user ldt selector to set */
+ struct real_descriptor uldt_desc; /* the actual user setable ldt data */
+#endif
+ decl_simple_lock_data(,lock)
+} *pcb_t;
+
+/*
+ * Maps state flavor to number of words in the state:
+ */
+__private_extern__ unsigned int _MachineStateCount[];
+
+#define USER_REGS(ThrAct) (&(ThrAct)->machine.pcb->iss)
+
+#define act_machine_state_ptr(ThrAct) (thread_state_t)USER_REGS(ThrAct)
+
+
+#define is_user_thread(ThrAct) \
+ ((USER_REGS(ThrAct)->efl & EFL_VM) \
+ || ((USER_REGS(ThrAct)->cs & 0x03) != 0))
+
+#define user_pc(ThrAct) (USER_REGS(ThrAct)->eip)
+#define user_sp(ThrAct) (USER_REGS(ThrAct)->uesp)
+
+struct machine_thread {
+ /*
+ * pointer to process control block
+ * (actual storage may as well be here, too)
+ */
+ struct pcb xxx_pcb;
+ pcb_t pcb;
+
+};
+
+extern struct i386_saved_state *get_user_regs(thread_t);
+
+extern void *act_thread_csave(void);
+extern void act_thread_catt(void *ctx);
+extern void act_thread_cfree(void *ctx);
projects / apple / xnu.git / blobdiff