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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#ifndef __ASSEMBLY__#error "Only include this from assembly code"#endif
#include <asm/ptrace.h>#include <asm/opcodes-virt.h>#include <asm/asm-offsets.h>#include <asm/page.h>#include <asm/pgtable.h>#include <asm/thread_info.h>#include <asm/uaccess-asm.h>
#define IOMEM(x) (x)
/* * Endian independent macros for shifting bytes within registers. */#ifndef __ARMEB__#define lspull lsr#define lspush lsl#define get_byte_0 lsl #0#define get_byte_1 lsr #8#define get_byte_2 lsr #16#define get_byte_3 lsr #24#define put_byte_0 lsl #0#define put_byte_1 lsl #8#define put_byte_2 lsl #16#define put_byte_3 lsl #24#else#define lspull lsl#define lspush lsr#define get_byte_0 lsr #24#define get_byte_1 lsr #16#define get_byte_2 lsr #8#define get_byte_3 lsl #0#define put_byte_0 lsl #24#define put_byte_1 lsl #16#define put_byte_2 lsl #8#define put_byte_3 lsl #0#endif
/* Select code for any configuration running in BE8 mode */#ifdef CONFIG_CPU_ENDIAN_BE8#define ARM_BE8(code...) code#else#define ARM_BE8(code...)#endif
/* * Data preload for architectures that support it */#if __LINUX_ARM_ARCH__ >= 5#define PLD(code...) code#else#define PLD(code...)#endif
/* * This can be used to enable code to cacheline align the destination * pointer when bulk writing to memory. Experiments on StrongARM and * XScale didn't show this a worthwhile thing to do when the cache is not * set to write-allocate (this would need further testing on XScale when WA * is used). * * On Feroceon there is much to gain however, regardless of cache mode. */#ifdef CONFIG_CPU_FEROCEON#define CALGN(code...) code#else#define CALGN(code...)#endif
#define IMM12_MASK 0xfff
/* the frame pointer used for stack unwinding */ARM( fpreg .req r11 )THUMB( fpreg .req r7 )
/* * Enable and disable interrupts */#if __LINUX_ARM_ARCH__ >= 6 .macro disable_irq_notrace cpsid i .endm
.macro enable_irq_notrace cpsie i .endm#else .macro disable_irq_notrace msr cpsr_c, #PSR_I_BIT | SVC_MODE .endm
.macro enable_irq_notrace msr cpsr_c, #SVC_MODE .endm#endif
#if __LINUX_ARM_ARCH__ < 7 .macro dsb, args mcr p15, 0, r0, c7, c10, 4 .endm
.macro isb, args mcr p15, 0, r0, c7, c5, 4 .endm#endif
.macro asm_trace_hardirqs_off, save=1#if defined(CONFIG_TRACE_IRQFLAGS) .if \save stmdb sp!, {r0-r3, ip, lr} .endif bl trace_hardirqs_off .if \save ldmia sp!, {r0-r3, ip, lr} .endif#endif .endm
.macro asm_trace_hardirqs_on, cond=al, save=1#if defined(CONFIG_TRACE_IRQFLAGS) /* * actually the registers should be pushed and pop'd conditionally, but * after bl the flags are certainly clobbered */ .if \save stmdb sp!, {r0-r3, ip, lr} .endif bl\cond trace_hardirqs_on .if \save ldmia sp!, {r0-r3, ip, lr} .endif#endif .endm
.macro disable_irq, save=1 disable_irq_notrace asm_trace_hardirqs_off \save .endm
.macro enable_irq asm_trace_hardirqs_on enable_irq_notrace .endm/* * 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#ifdef CONFIG_CPU_V7M mrs \oldcpsr, primask#else mrs \oldcpsr, cpsr#endif disable_irq .endm
.macro save_and_disable_irqs_notrace, oldcpsr#ifdef CONFIG_CPU_V7M mrs \oldcpsr, primask#else mrs \oldcpsr, cpsr#endif disable_irq_notrace .endm
/* * Restore interrupt state previously stored in a register. We don't * guarantee that this will preserve the flags. */ .macro restore_irqs_notrace, oldcpsr#ifdef CONFIG_CPU_V7M msr primask, \oldcpsr#else msr cpsr_c, \oldcpsr#endif .endm
.macro restore_irqs, oldcpsr tst \oldcpsr, #PSR_I_BIT asm_trace_hardirqs_on cond=eq restore_irqs_notrace \oldcpsr .endm
/* * Assembly version of "adr rd, BSYM(sym)". This should only be used to * reference local symbols in the same assembly file which are to be * resolved by the assembler. Other usage is undefined. */ .irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo .macro badr\c, rd, sym#ifdef CONFIG_THUMB2_KERNEL adr\c \rd, \sym + 1#else adr\c \rd, \sym#endif .endm .endr
/* * Get current thread_info. */ .macro get_thread_info, rd /* thread_info is the first member of struct task_struct */ get_current \rd .endm
/* * Increment/decrement the preempt count. */#ifdef CONFIG_PREEMPT_COUNT .macro inc_preempt_count, ti, tmp ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count add \tmp, \tmp, #1 @ increment it str \tmp, [\ti, #TI_PREEMPT] .endm
.macro dec_preempt_count, ti, tmp ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count sub \tmp, \tmp, #1 @ decrement it str \tmp, [\ti, #TI_PREEMPT] .endm#else .macro inc_preempt_count, ti, tmp .endm
.macro dec_preempt_count, ti, tmp .endm#endif
#define USERL(l, x...) \9999: x; \ .pushsection __ex_table,"a"; \ .align 3; \ .long 9999b,l; \ .popsection
#define USER(x...) USERL(9001f, x)
#ifdef CONFIG_SMP#define ALT_SMP(instr...) \9998: instr/* * Note: if you get assembler errors from ALT_UP() when building with * CONFIG_THUMB2_KERNEL, you almost certainly need to use * ALT_SMP( W(instr) ... ) */#define ALT_UP(instr...) \ .pushsection ".alt.smp.init", "a" ;\ .align 2 ;\ .long 9998b - . ;\9997: instr ;\ .if . - 9997b == 2 ;\ nop ;\ .endif ;\ .if . - 9997b != 4 ;\ .error "ALT_UP() content must assemble to exactly 4 bytes";\ .endif ;\ .popsection#define ALT_UP_B(label) \ .pushsection ".alt.smp.init", "a" ;\ .align 2 ;\ .long 9998b - . ;\ W(b) . + (label - 9998b) ;\ .popsection#else#define ALT_SMP(instr...)#define ALT_UP(instr...) instr#define ALT_UP_B(label) b label#endif
/* * this_cpu_offset - load the per-CPU offset of this CPU into * register 'rd' */ .macro this_cpu_offset, rd:req#ifdef CONFIG_SMPALT_SMP(mrc p15, 0, \rd, c13, c0, 4)#ifdef CONFIG_CPU_V6ALT_UP_B(.L1_\@).L0_\@: .subsection 1.L1_\@: ldr_va \rd, __per_cpu_offset b .L0_\@ .previous#endif#else mov \rd, #0#endif .endm
/* * set_current - store the task pointer of this CPU's current task */ .macro set_current, rn:req, tmp:req#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)9998: mcr p15, 0, \rn, c13, c0, 3 @ set TPIDRURO register#ifdef CONFIG_CPU_V6ALT_UP_B(.L0_\@) .subsection 1.L0_\@: str_va \rn, __current, \tmp b .L1_\@ .previous.L1_\@:#endif#else str_va \rn, __current, \tmp#endif .endm
/* * get_current - load the task pointer of this CPU's current task */ .macro get_current, rd:req#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)9998: mrc p15, 0, \rd, c13, c0, 3 @ get TPIDRURO register#ifdef CONFIG_CPU_V6ALT_UP_B(.L0_\@) .subsection 1.L0_\@: ldr_va \rd, __current b .L1_\@ .previous.L1_\@:#endif#else ldr_va \rd, __current#endif .endm
/* * reload_current - reload the task pointer of this CPU's current task * into the TLS register */ .macro reload_current, t1:req, t2:req#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)#ifdef CONFIG_CPU_V6ALT_SMP(nop)ALT_UP_B(.L0_\@)#endif ldr_this_cpu \t1, __entry_task, \t1, \t2 mcr p15, 0, \t1, c13, c0, 3 @ store in TPIDRURO.L0_\@:#endif .endm
/* * Instruction barrier */ .macro instr_sync#if __LINUX_ARM_ARCH__ >= 7 isb#elif __LINUX_ARM_ARCH__ == 6 mcr p15, 0, r0, c7, c5, 4#endif .endm
/* * SMP data memory barrier */ .macro smp_dmb mode#ifdef CONFIG_SMP#if __LINUX_ARM_ARCH__ >= 7 .ifeqs "\mode","arm" ALT_SMP(dmb ish) .else ALT_SMP(W(dmb) ish) .endif#elif __LINUX_ARM_ARCH__ == 6 ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb#else#error Incompatible SMP platform#endif .ifeqs "\mode","arm" ALT_UP(nop) .else ALT_UP(W(nop)) .endif#endif .endm
/* * Raw SMP data memory barrier */ .macro __smp_dmb mode#if __LINUX_ARM_ARCH__ >= 7 .ifeqs "\mode","arm" dmb ish .else W(dmb) ish .endif#elif __LINUX_ARM_ARCH__ == 6 mcr p15, 0, r0, c7, c10, 5 @ dmb#else .error "Incompatible SMP platform"#endif .endm
#if defined(CONFIG_CPU_V7M) /* * setmode is used to assert to be in svc mode during boot. For v7-M * this is done in __v7m_setup, so setmode can be empty here. */ .macro setmode, mode, reg .endm#elif defined(CONFIG_THUMB2_KERNEL) .macro setmode, mode, reg mov \reg, #\mode msr cpsr_c, \reg .endm#else .macro setmode, mode, reg msr cpsr_c, #\mode .endm#endif
/* * Helper macro to enter SVC mode cleanly and mask interrupts. reg is * a scratch register for the macro to overwrite. * * This macro is intended for forcing the CPU into SVC mode at boot time. * you cannot return to the original mode. */.macro safe_svcmode_maskall reg:req#if __LINUX_ARM_ARCH__ >= 6 && !defined(CONFIG_CPU_V7M) mrs \reg , cpsr eor \reg, \reg, #HYP_MODE tst \reg, #MODE_MASK bic \reg , \reg , #MODE_MASK orr \reg , \reg , #PSR_I_BIT | PSR_F_BIT | SVC_MODETHUMB( orr \reg , \reg , #PSR_T_BIT ) bne 1f orr \reg, \reg, #PSR_A_BIT badr lr, 2f msr spsr_cxsf, \reg __MSR_ELR_HYP(14) __ERET1: msr cpsr_c, \reg2:#else/* * workaround for possibly broken pre-v6 hardware * (akita, Sharp Zaurus C-1000, PXA270-based) */ setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, \reg#endif.endm
/* * STRT/LDRT access macros with ARM and Thumb-2 variants */#ifdef CONFIG_THUMB2_KERNEL
.macro usraccoff, instr, reg, ptr, inc, off, cond, abort, t=TUSER()9999: .if \inc == 1 \instr\()b\t\cond\().w \reg, [\ptr, #\off] .elseif \inc == 4 \instr\t\cond\().w \reg, [\ptr, #\off] .else .error "Unsupported inc macro argument" .endif
.pushsection __ex_table,"a" .align 3 .long 9999b, \abort .popsection .endm
.macro usracc, instr, reg, ptr, inc, cond, rept, abort @ explicit IT instruction needed because of the label @ introduced by the USER macro .ifnc \cond,al .if \rept == 1 itt \cond .elseif \rept == 2 ittt \cond .else .error "Unsupported rept macro argument" .endif .endif
@ Slightly optimised to avoid incrementing the pointer twice usraccoff \instr, \reg, \ptr, \inc, 0, \cond, \abort .if \rept == 2 usraccoff \instr, \reg, \ptr, \inc, \inc, \cond, \abort .endif
add\cond \ptr, #\rept * \inc .endm
#else /* !CONFIG_THUMB2_KERNEL */
.macro usracc, instr, reg, ptr, inc, cond, rept, abort, t=TUSER() .rept \rept9999: .if \inc == 1 \instr\()b\t\cond \reg, [\ptr], #\inc .elseif \inc == 4 \instr\t\cond \reg, [\ptr], #\inc .else .error "Unsupported inc macro argument" .endif
.pushsection __ex_table,"a" .align 3 .long 9999b, \abort .popsection .endr .endm
#endif /* CONFIG_THUMB2_KERNEL */
.macro strusr, reg, ptr, inc, cond=al, rept=1, abort=9001f usracc str, \reg, \ptr, \inc, \cond, \rept, \abort .endm
.macro ldrusr, reg, ptr, inc, cond=al, rept=1, abort=9001f usracc ldr, \reg, \ptr, \inc, \cond, \rept, \abort .endm
/* Utility macro for declaring string literals */ .macro string name:req, string .type \name , #object\name: .asciz "\string" .size \name , . - \name .endm
.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo .macro ret\c, reg#if __LINUX_ARM_ARCH__ < 6 mov\c pc, \reg#else .ifeqs "\reg", "lr" bx\c \reg .else mov\c pc, \reg .endif#endif .endm .endr
.macro ret.w, reg ret \reg#ifdef CONFIG_THUMB2_KERNEL nop#endif .endm
.macro bug, msg, line#ifdef CONFIG_THUMB2_KERNEL1: .inst 0xde02#else1: .inst 0xe7f001f2#endif#ifdef CONFIG_DEBUG_BUGVERBOSE .pushsection .rodata.str, "aMS", %progbits, 12: .asciz "\msg" .popsection .pushsection __bug_table, "aw" .align 2 .word 1b, 2b .hword \line .popsection#endif .endm
#ifdef CONFIG_KPROBES#define _ASM_NOKPROBE(entry) \ .pushsection "_kprobe_blacklist", "aw" ; \ .balign 4 ; \ .long entry; \ .popsection#else#define _ASM_NOKPROBE(entry)#endif
.macro __adldst_l, op, reg, sym, tmp, c .if __LINUX_ARM_ARCH__ < 7 ldr\c \tmp, .La\@ .subsection 1 .align 2.La\@: .long \sym - .Lpc\@ .previous .else .ifnb \c THUMB( ittt \c ) .endif movw\c \tmp, #:lower16:\sym - .Lpc\@ movt\c \tmp, #:upper16:\sym - .Lpc\@ .endif
#ifndef CONFIG_THUMB2_KERNEL .set .Lpc\@, . + 8 // PC bias .ifc \op, add add\c \reg, \tmp, pc .else \op\c \reg, [pc, \tmp] .endif#else.Lb\@: add\c \tmp, \tmp, pc /* * In Thumb-2 builds, the PC bias depends on whether we are currently * emitting into a .arm or a .thumb section. The size of the add opcode * above will be 2 bytes when emitting in Thumb mode and 4 bytes when * emitting in ARM mode, so let's use this to account for the bias. */ .set .Lpc\@, . + (. - .Lb\@)
.ifnc \op, add \op\c \reg, [\tmp] .endif#endif .endm
/* * mov_l - move a constant value or [relocated] address into a register */ .macro mov_l, dst:req, imm:req, cond .if __LINUX_ARM_ARCH__ < 7 ldr\cond \dst, =\imm .else movw\cond \dst, #:lower16:\imm movt\cond \dst, #:upper16:\imm .endif .endm
/* * adr_l - adr pseudo-op with unlimited range * * @dst: destination register * @sym: name of the symbol * @cond: conditional opcode suffix */ .macro adr_l, dst:req, sym:req, cond __adldst_l add, \dst, \sym, \dst, \cond .endm
/* * ldr_l - ldr <literal> pseudo-op with unlimited range * * @dst: destination register * @sym: name of the symbol * @cond: conditional opcode suffix */ .macro ldr_l, dst:req, sym:req, cond __adldst_l ldr, \dst, \sym, \dst, \cond .endm
/* * str_l - str <literal> pseudo-op with unlimited range * * @src: source register * @sym: name of the symbol * @tmp: mandatory scratch register * @cond: conditional opcode suffix */ .macro str_l, src:req, sym:req, tmp:req, cond __adldst_l str, \src, \sym, \tmp, \cond .endm
.macro __ldst_va, op, reg, tmp, sym, cond, offset#if __LINUX_ARM_ARCH__ >= 7 || \ !defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \ (defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS)) mov_l \tmp, \sym, \cond#else /* * Avoid a literal load, by emitting a sequence of ADD/LDR instructions * with the appropriate relocations. The combined sequence has a range * of -/+ 256 MiB, which should be sufficient for the core kernel and * for modules loaded into the module region. */ .globl \sym .reloc .L0_\@, R_ARM_ALU_PC_G0_NC, \sym .reloc .L1_\@, R_ARM_ALU_PC_G1_NC, \sym .reloc .L2_\@, R_ARM_LDR_PC_G2, \sym.L0_\@: sub\cond \tmp, pc, #8 - \offset.L1_\@: sub\cond \tmp, \tmp, #4 - \offset.L2_\@:#endif \op\cond \reg, [\tmp, #\offset] .endm
/* * ldr_va - load a 32-bit word from the virtual address of \sym */ .macro ldr_va, rd:req, sym:req, cond, tmp, offset=0 .ifnb \tmp __ldst_va ldr, \rd, \tmp, \sym, \cond, \offset .else __ldst_va ldr, \rd, \rd, \sym, \cond, \offset .endif .endm
/* * str_va - store a 32-bit word to the virtual address of \sym */ .macro str_va, rn:req, sym:req, tmp:req, cond __ldst_va str, \rn, \tmp, \sym, \cond, 0 .endm
/* * ldr_this_cpu_armv6 - Load a 32-bit word from the per-CPU variable 'sym', * without using a temp register. Supported in ARM mode * only. */ .macro ldr_this_cpu_armv6, rd:req, sym:req this_cpu_offset \rd .globl \sym .reloc .L0_\@, R_ARM_ALU_PC_G0_NC, \sym .reloc .L1_\@, R_ARM_ALU_PC_G1_NC, \sym .reloc .L2_\@, R_ARM_LDR_PC_G2, \sym add \rd, \rd, pc.L0_\@: sub \rd, \rd, #4.L1_\@: sub \rd, \rd, #0.L2_\@: ldr \rd, [\rd, #4] .endm
/* * ldr_this_cpu - Load a 32-bit word from the per-CPU variable 'sym' * into register 'rd', which may be the stack pointer, * using 't1' and 't2' as general temp registers. These * are permitted to overlap with 'rd' if != sp */ .macro ldr_this_cpu, rd:req, sym:req, t1:req, t2:req#ifndef CONFIG_SMP ldr_va \rd, \sym, tmp=\t1#elif __LINUX_ARM_ARCH__ >= 7 || \ !defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \ (defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS)) this_cpu_offset \t1 mov_l \t2, \sym ldr \rd, [\t1, \t2]#else ldr_this_cpu_armv6 \rd, \sym#endif .endm
/* * rev_l - byte-swap a 32-bit value * * @val: source/destination register * @tmp: scratch register */ .macro rev_l, val:req, tmp:req .if __LINUX_ARM_ARCH__ < 6 eor \tmp, \val, \val, ror #16 bic \tmp, \tmp, #0x00ff0000 mov \val, \val, ror #8 eor \val, \val, \tmp, lsr #8 .else rev \val, \val .endif .endm
.if __LINUX_ARM_ARCH__ < 6 .set .Lrev_l_uses_tmp, 1 .else .set .Lrev_l_uses_tmp, 0 .endif
/* * bl_r - branch and link to register * * @dst: target to branch to * @c: conditional opcode suffix */ .macro bl_r, dst:req, c .if __LINUX_ARM_ARCH__ < 6 mov\c lr, pc mov\c pc, \dst .else blx\c \dst .endif .endm
#endif /* __ASM_ASSEMBLER_H__ */