+
+/*
+ * x86_saved_state32/64:
+ *
+ * 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.
+ */
+
+/*
+ * Save area for user floating-point state.
+ * Allocated only when necessary.
+ */
+
+struct x86_fpsave_state {
+ boolean_t fp_valid;
+ enum {
+ FXSAVE32 = 1,
+ FXSAVE64 = 2
+ } fp_save_layout;
+ struct x86_fx_save fx_save_state __attribute__ ((aligned (16)));
+};
+
+
+/*
+ * x86_kernel_state32:
+ *
+ * This structure corresponds to the state of kernel registers
+ * as saved in a context-switch. It lives at the base of the stack.
+ * kernel only runs in 32 bit mode for now
+ */
+
+struct x86_kernel_state32 {
+ int k_ebx; /* kernel context */
+ int k_esp;
+ int k_ebp;
+ int k_edi;
+ int k_esi;
+ int k_eip;
+ /*
+ * Kernel stacks are 16-byte aligned with a 4-byte i386_exception_link at
+ * the top, followed by an x86_kernel_state32. After both structs have
+ * been pushed, we want to be 16-byte aligned. A dummy int gets us there.
+ */
+ int dummy;
+};
+
+
+typedef struct pcb {
+ void *sf;
+ x86_saved_state_t *iss;
+ struct x86_fpsave_state *ifps;
+#ifdef MACH_BSD
+ uint64_t 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);
+ uint64_t iss_pte0;
+ uint64_t iss_pte1;
+ void *ids;
+ uint32_t arg_store_valid;
+} *pcb_t;
+
+
+/*
+ * Maps state flavor to number of words in the state:
+ */
+__private_extern__ unsigned int _MachineStateCount[];
+
+#define USER_STATE(ThrAct) ((ThrAct)->machine.pcb->iss)
+#define USER_REGS32(ThrAct) (saved_state32(USER_STATE(ThrAct)))
+#define USER_REGS64(ThrAct) (saved_state64(USER_STATE(ThrAct)))
+
+#define user_pc(ThrAct) (is_saved_state32(USER_STATE(ThrAct)) ? \
+ USER_REGS32(ThrAct)->eip : \
+ USER_REGS64(ThrAct)->isf.rip )
+
+
+struct machine_thread {
+ /*
+ * pointer to process control block
+ * (actual storage may as well be here, too)
+ */
+ struct pcb xxx_pcb;
+ pcb_t pcb;
+
+ uint32_t specFlags;
+#define OnProc 0x1
+#if CONFIG_DTRACE
+#define CopyIOActive 0x2 /* Checked to ensure DTrace actions do not re-enter copyio(). */
+#endif /* CONFIG_DTRACE */
+
+ struct {
+ user_addr_t user_base;
+ } copy_window[NCOPY_WINDOWS];
+ int nxt_window;
+ int copyio_state;
+#define WINDOWS_DIRTY 0
+#define WINDOWS_CLEAN 1
+#define WINDOWS_CLOSED 2
+#define WINDOWS_OPENED 3
+ uint64_t physwindow_pte;
+ int physwindow_busy;
+};
+
+
+extern void *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