assembler.h
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上传日期:2013-04-10
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- /*
- * linux/asm-arm/proc-armv/assembler.h
- *
- * Copyright (C) 1996-2000 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This file contains ARM processor specifics for
- * the ARM6 and better processors.
- */
- #define MODE_USR USR_MODE
- #define MODE_FIQ FIQ_MODE
- #define MODE_IRQ IRQ_MODE
- #define MODE_SVC SVC_MODE
- #define DEFAULT_FIQ MODE_FIQ
- /*
- * LOADREGS - ldm with PC in register list (eg, ldmfd sp!, {pc})
- */
- #ifdef __STDC__
- #define LOADREGS(cond, base, reglist...)
- ldm##cond base,reglist
- #else
- #define LOADREGS(cond, base, reglist...)
- ldm/**/cond base,reglist
- #endif
- /*
- * Build a return instruction for this processor type.
- */
- #define RETINSTR(instr, regs...)
- instr regs
- /*
- * Save the current IRQ state and disable IRQs. Note that this macro
- * assumes FIQs are enabled, and that the processor is in SVC mode.
- */
- .macro save_and_disable_irqs, oldcpsr, temp
- mrs oldcpsr, cpsr
- mov temp, #I_BIT | MODE_SVC
- msr cpsr_c, temp
- .endm
- /*
- * Restore interrupt state previously stored in a register. We don't
- * guarantee that this will preserve the flags.
- */
- .macro restore_irqs, oldcpsr
- msr cpsr_c, oldcpsr
- .endm
- /*
- * These two are used to save LR/restore PC over a user-based access.
- * The old 26-bit architecture requires that we do. On 32-bit
- * architecture, we can safely ignore this requirement.
- */
- .macro save_lr
- .endm
- .macro restore_pc
- mov pc, lr
- .endm
- #define USER(x...)
- 9999: x;
- .section __ex_table,"a";
- .align 3;
- .long 9999b,9001f;
- .previous