#include <cfg/compiler.h> /* for uintXX_t */
#if CPU_X86
-
- #define CPU_SAVED_REGS_CNT 7
+ #if CPU_X86_32
+ #define CPU_SAVED_REGS_CNT 2
+ #elif CPU_X86_64
+ #define CPU_SAVED_REGS_CNT 8
+ #else
+ #error "unknown CPU"
+ #endif
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 0
#elif CPU_ARM
- #define CPU_SAVED_REGS_CNT 9
+ #define CPU_SAVED_REGS_CNT 8
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 0
- /**
- * Initialization value for registers in stack frame.
- * The register index is not directly corrispondent to CPU
- * register numbers, but is related to how are pushed to
- * stack (\see asm_switch_context).
- * Index (CPU_SAVED_REGS_CNT - 1) is the CPSR register,
- * the initial value is set to:
- * - All flags (N, Z, C, V) set to 0.
- * - IRQ and FIQ enabled.
- * - ARM state.
- * - CPU in Supervisor Mode (SVC).
- */
- #define CPU_REG_INIT_VALUE(reg) (reg == (CPU_SAVED_REGS_CNT - 1) ? 0x13 : 0)
+#elif CPU_CM3
+
+ #define CPU_SAVED_REGS_CNT 8
+ #define CPU_STACK_GROWS_UPWARD 0
+ #define CPU_SP_ON_EMPTY_SLOT 0
#elif CPU_PPC
#define CPU_SAVED_REGS_CNT 1
#define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 0
+ #define CPU_SP_ON_EMPTY_SLOT 1
#elif CPU_DSP56K
#elif CPU_AVR
- #define CPU_SAVED_REGS_CNT 19
+ #define CPU_SAVED_REGS_CNT 18
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 1
- /**
- * Initialization value for registers in stack frame.
- * The register index is not directly corrispondent to CPU
- * register numbers. Index 0 is the SREG register: the initial
- * value is all 0 but the interrupt bit (bit 7).
- */
- #define CPU_REG_INIT_VALUE(reg) (reg == 0 ? 0x80 : 0)
+#elif CPU_MSP430
+
+ #define CPU_SAVED_REGS_CNT 16
+ #define CPU_STACK_GROWS_UPWARD 1
+ #define CPU_SP_ON_EMPTY_SLOT 0
#else
#error No CPU_... defined.
/// Default for macro not defined in the right arch section
#ifndef CPU_REG_INIT_VALUE
- #define CPU_REG_INIT_VALUE(reg) 0
+ #define CPU_REG_INIT_VALUE(reg) (reg)
#endif
/*
#if !CPU_SP_ON_EMPTY_SLOT
/* DSP56K and other weirdos */
#define CPU_PUSH_WORD(sp, data) \
- do { *++(sp) = (cpustack_t)(data); } while (0)
+ do { *++(sp) = (cpu_stack_t)(data); } while (0)
#define CPU_POP_WORD(sp) \
(*(sp)--)
#else
CPU_PUSH_WORD((sp), 0x100); \
} while (0);
+#elif CPU_CM3
+
+ #if CONFIG_KERN_PREEMPT
+ INLINE void cm3_preempt_switch_context(cpu_stack_t **new_sp, cpu_stack_t **old_sp)
+ {
+ register cpu_stack_t **__new_sp asm ("r0") = new_sp;
+ register cpu_stack_t **__old_sp asm ("r1") = old_sp;
+
+ asm volatile ("svc #0"
+ : : "r"(__new_sp), "r"(__old_sp) : "memory", "cc");
+ }
+ #define asm_switch_context cm3_preempt_switch_context
+
+ #define CPU_CREATE_NEW_STACK(stack) \
+ do { \
+ size_t i; \
+ /* Initialize process stack frame */ \
+ CPU_PUSH_WORD((stack), 0x01000000); /* xPSR */ \
+ CPU_PUSH_WORD((stack), (cpu_stack_t)proc_entry); /* pc */ \
+ CPU_PUSH_WORD((stack), 0); /* lr */ \
+ CPU_PUSH_WORD((stack), 0); /* ip */ \
+ CPU_PUSH_WORD((stack), 0); /* r3 */ \
+ CPU_PUSH_WORD((stack), 0); /* r2 */ \
+ CPU_PUSH_WORD((stack), 0); /* r1 */ \
+ CPU_PUSH_WORD((stack), 0); /* r0 */ \
+ CPU_PUSH_WORD((stack), 0xfffffffd); /* lr_exc */ \
+ /* Push a clean set of CPU registers for asm_switch_context() */ \
+ for (i = 0; i < CPU_SAVED_REGS_CNT; i++) \
+ CPU_PUSH_WORD(stack, CPU_REG_INIT_VALUE(i)); \
+ CPU_PUSH_WORD(stack, IRQ_PRIO_DISABLED); \
+ } while (0)
+
+ #endif /* CONFIG_KERN_PREEMPT */
+
#elif CPU_AVR
/*
* On AVR, addresses are pushed into the stack as little-endian, while
#define CPU_PUSH_CALL_FRAME(sp, func) \
do { \
- CPU_PUSH_WORD((sp), (cpustack_t)(func)); /* LR -> 8(SP) */ \
+ CPU_PUSH_WORD((sp), (cpu_stack_t)(func)); /* LR -> 8(SP) */ \
CPU_PUSH_WORD((sp), 0); /* CR -> 4(SP) */ \
} while (0)
-#else
+#endif
+
+#ifndef CPU_PUSH_CALL_FRAME
#define CPU_PUSH_CALL_FRAME(sp, func) \
- CPU_PUSH_WORD((sp), (cpustack_t)(func))
+ CPU_PUSH_WORD((sp), (cpu_stack_t)(func))
#endif
/**
* in hosted environments such as emulators.
*/
#ifndef CPU_IDLE
- #if defined(ARCH_EMUL) && (ARCH & ARCH_EMUL)
- /* This emulator hook should yield the CPU to the host. */
- EXTERN_C_BEGIN
- void emul_idle(void);
- EXTERN_C_END
- #define CPU_IDLE emul_idle()
- #else /* !ARCH_EMUL */
- #define CPU_IDLE do { /* nothing */ } while (0)
- #endif /* !ARCH_EMUL */
+ #define CPU_IDLE PAUSE
#endif /* !CPU_IDLE */
+/**
+ * Default macro for creating a new Process stack
+ */
+#ifndef CPU_CREATE_NEW_STACK
+
+ #define CPU_CREATE_NEW_STACK(stack) \
+ do { \
+ size_t i; \
+ /* Initialize process stack frame */ \
+ CPU_PUSH_CALL_FRAME(stack, proc_entry); \
+ /* Push a clean set of CPU registers for asm_switch_context() */ \
+ for (i = 0; i < CPU_SAVED_REGS_CNT; i++) \
+ CPU_PUSH_WORD(stack, CPU_REG_INIT_VALUE(i)); \
+ } while (0)
+#endif
+
#endif /* CPU_ATTR_H */