mirror of https://github.com/ctm/syn68k.git
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#ifndef _trap_h_
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#define _trap_h_
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#include "syn68k_private.h"
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extern syn68k_addr_t trap_direct (uint32 trap_number,
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syn68k_addr_t exception_pc,
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syn68k_addr_t exception_address);
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extern uint32 trap_forwarded (syn68k_addr_t m68k_address, void *arg);
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extern void trap_init (void);
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extern void trap_install_handler (unsigned trap_number,
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callback_handler_t func,
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void *arbitrary_argument);
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extern void trap_remove_handler (unsigned trap_number);
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extern uint32 *trap_vector_array;
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#define SR_SUPERVISOR_BIT 0x2000
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#define SR_MASTER_BIT 0x1000
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#define USE_USP(sr) (!((sr) & SR_SUPERVISOR_BIT))
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#define USE_MSP(sr) (((sr) & (SR_SUPERVISOR_BIT | SR_MASTER_BIT)) \
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== (SR_SUPERVISOR_BIT | SR_MASTER_BIT))
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#define USE_ISP(sr) (((sr) & (SR_SUPERVISOR_BIT | SR_MASTER_BIT)) \
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== SR_SUPERVISOR_BIT)
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#define FETCH_USP() (USE_USP (cpu_state.sr) ? EM_A7 : cpu_state.usp)
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#define FETCH_MSP() (USE_MSP (cpu_state.sr) ? EM_A7 : cpu_state.msp)
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#define FETCH_ISP() (USE_ISP (cpu_state.sr) ? EM_A7 : cpu_state.isp)
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#define SET_USP(n) \
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(USE_USP (cpu_state.sr) ? (EM_A7 = (n)) : (cpu_state.usp = (n)))
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#define SET_MSP(n) \
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(USE_MSP (cpu_state.sr) ? (EM_A7 = (n)) : (cpu_state.msp = (n)))
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#define SET_ISP(n) \
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(USE_ISP (cpu_state.sr) ? (EM_A7 = (n)) : (cpu_state.isp = (n)))
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#define SWITCH_A7(old_sr, new_sr) \
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do \
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{ \
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if (((old_sr) ^ (new_sr)) & (SR_SUPERVISOR_BIT | SR_MASTER_BIT)) \
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{ \
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/* Save away the old a7. */ \
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if (USE_USP (old_sr)) \
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cpu_state.usp = EM_A7; \
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else if (USE_MSP (old_sr)) \
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cpu_state.msp = EM_A7; \
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else \
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cpu_state.isp = EM_A7; \
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\
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/* Load up the new value. */ \
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if (USE_USP (new_sr)) \
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EM_A7 = cpu_state.usp; \
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else if (USE_MSP (new_sr)) \
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EM_A7 = cpu_state.msp; \
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else \
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EM_A7 = cpu_state.isp; \
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} \
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} while (0)
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#endif /* Not _trap_h_ */
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