Squash commits for public release

kernel/include/platform/arm32/tasking/trapframe.h

@@ -0,0 +1,107 @@
+#ifndef _KERNEL_PLATFORM_ARM32_TASKING_TRAPFRAME_H
+#define _KERNEL_PLATFORM_ARM32_TASKING_TRAPFRAME_H
+
+#include <libkern/c_attrs.h>
+#include <libkern/log.h>
+#include <libkern/types.h>
+
+#define CPSR_M_USR 0x10U
+#define CPSR_M_FIQ 0x11U
+#define CPSR_M_IRQ 0x12U
+#define CPSR_M_SVC 0x13U
+#define CPSR_M_MON 0x16U
+#define CPSR_M_ABT 0x17U
+#define CPSR_M_HYP 0x1AU
+#define CPSR_M_UND 0x1BU
+#define CPSR_M_SYS 0x1FU
+
+typedef struct {
+    uint32_t user_flags;
+    uint32_t user_sp;
+    uint32_t user_lr;
+    uint32_t r[13];
+    uint32_t user_ip;
+} PACKED trapframe_t;
+
+static inline uintptr_t get_stack_pointer(trapframe_t* tf)
+{
+    return tf->user_sp;
+}
+
+static inline void set_stack_pointer(trapframe_t* tf, uintptr_t sp)
+{
+    tf->user_sp = sp;
+}
+
+static inline uintptr_t get_frame_pointer(trapframe_t* tf)
+{
+    return 0;
+}
+
+static inline void set_frame_pointer(trapframe_t* tf, uintptr_t bp)
+{
+}
+
+static inline uintptr_t get_instruction_pointer(trapframe_t* tf)
+{
+    return tf->user_ip;
+}
+
+static inline void set_instruction_pointer(trapframe_t* tf, uintptr_t ip)
+{
+    tf->user_ip = ip;
+}
+
+static inline uint32_t get_syscall_result(trapframe_t* tf)
+{
+    return tf->r[0];
+}
+
+static inline void set_syscall_result(trapframe_t* tf, uintptr_t val)
+{
+    tf->r[0] = val;
+}
+
+/**
+ * STACK FUNCTIONS
+ */
+
+static inline void tf_push_to_stack(trapframe_t* tf, uintptr_t val)
+{
+    tf->user_sp -= sizeof(uintptr_t);
+    *((uintptr_t*)tf->user_sp) = val;
+}
+
+static inline uintptr_t tf_pop_to_stack(trapframe_t* tf)
+{
+    uintptr_t val = *((uintptr_t*)tf->user_sp);
+    tf->user_sp += sizeof(uintptr_t);
+    return val;
+}
+
+static inline void tf_move_stack_pointer(trapframe_t* tf, int32_t val)
+{
+    tf->user_sp += val;
+}
+
+static inline void tf_setup_as_user_thread(trapframe_t* tf)
+{
+    tf->user_flags = 0x60000100 | CPSR_M_USR;
+}
+
+static inline void tf_setup_as_kernel_thread(trapframe_t* tf)
+{
+    tf->user_flags = 0x60000100 | CPSR_M_SYS;
+}
+
+static void dump_tf(trapframe_t* tf)
+{
+    for (int i = 0; i < 13; i++) {
+        log("r[%d]: %x", i, tf->r[i]);
+    }
+    log("sp: %x", tf->user_sp);
+    log("ip: %x", tf->user_ip);
+    log("fl: %x", tf->user_flags);
+}
+
+#endif // _KERNEL_PLATFORM_ARM32_TASKING_TRAPFRAME_H