1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
182 lines
3.8 KiB
ArmAsm
182 lines
3.8 KiB
ArmAsm
#include <linux/config.h> /* for CONFIG_ARCH_xxxx */
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/constants.h>
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#include <asm/errno.h>
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#include <asm/hardware.h>
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#include <asm/arch/irqs.h>
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#include <asm/arch/entry-macro.S>
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#ifndef MODE_SVC
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#define MODE_SVC 0x13
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#endif
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.macro zero_fp
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#ifdef CONFIG_FRAME_POINTER
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mov fp, #0
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#endif
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.endm
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.text
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@ Bad Abort numbers
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@ -----------------
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@
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#define BAD_PREFETCH 0
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#define BAD_DATA 1
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#define BAD_ADDREXCPTN 2
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#define BAD_IRQ 3
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#define BAD_UNDEFINSTR 4
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#define PT_TRACESYS 0x00000002
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@ OS version number used in SWIs
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@ RISC OS is 0
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@ RISC iX is 8
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@
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#define OS_NUMBER 9
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#define ARMSWI_OFFSET 0x000f0000
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@
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@ Stack format (ensured by USER_* and SVC_*)
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@
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#define S_FRAME_SIZE 72
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#define S_OLD_R0 68
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#define S_PSR 64
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#define S_PC 60
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#define S_LR 56
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#define S_SP 52
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#define S_IP 48
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#define S_FP 44
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#define S_R10 40
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#define S_R9 36
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#define S_R8 32
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#define S_R7 28
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#define S_R6 24
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#define S_R5 20
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#define S_R4 16
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#define S_R3 12
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#define S_R2 8
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#define S_R1 4
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#define S_R0 0
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#define S_OFF 8
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.macro set_cpsr_c, reg, mode
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msr cpsr_c, \mode
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.endm
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#if __LINUX_ARM_ARCH__ >= 6
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.macro disable_irq, temp
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cpsid i
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.endm
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.macro enable_irq, temp
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cpsie i
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.endm
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#else
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.macro disable_irq, temp
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set_cpsr_c \temp, #PSR_I_BIT | MODE_SVC
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.endm
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.macro enable_irq, temp
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set_cpsr_c \temp, #MODE_SVC
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.endm
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#endif
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.macro save_user_regs
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sub sp, sp, #S_FRAME_SIZE
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stmia sp, {r0 - r12} @ Calling r0 - r12
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add r8, sp, #S_PC
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stmdb r8, {sp, lr}^ @ Calling sp, lr
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mrs r8, spsr @ called from non-FIQ mode, so ok.
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str lr, [sp, #S_PC] @ Save calling PC
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str r8, [sp, #S_PSR] @ Save CPSR
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str r0, [sp, #S_OLD_R0] @ Save OLD_R0
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.endm
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.macro restore_user_regs
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ldr r1, [sp, #S_PSR] @ Get calling cpsr
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disable_irq ip @ disable IRQs
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ldr lr, [sp, #S_PC]! @ Get PC
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msr spsr_cxsf, r1 @ save in spsr_svc
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ldmdb sp, {r0 - lr}^ @ Get calling r0 - lr
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mov r0, r0
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add sp, sp, #S_FRAME_SIZE - S_PC
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movs pc, lr @ return & move spsr_svc into cpsr
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.endm
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/*
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* Must be called with IRQs already disabled.
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*/
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.macro fast_restore_user_regs
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ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr
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ldr lr, [sp, #S_OFF + S_PC]! @ get pc
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msr spsr_cxsf, r1 @ save in spsr_svc
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ldmdb sp, {r1 - lr}^ @ get calling r1 - lr
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mov r0, r0
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add sp, sp, #S_FRAME_SIZE - S_PC
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movs pc, lr @ return & move spsr_svc into cpsr
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.endm
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/*
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* Must be called with IRQs already disabled.
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*/
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.macro slow_restore_user_regs
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ldr r1, [sp, #S_PSR] @ get calling cpsr
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ldr lr, [sp, #S_PC]! @ get pc
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msr spsr_cxsf, r1 @ save in spsr_svc
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ldmdb sp, {r0 - lr}^ @ get calling r1 - lr
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mov r0, r0
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add sp, sp, #S_FRAME_SIZE - S_PC
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movs pc, lr @ return & move spsr_svc into cpsr
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.endm
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.macro mask_pc, rd, rm
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.endm
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.macro get_thread_info, rd
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mov \rd, sp, lsr #13
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mov \rd, \rd, lsl #13
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.endm
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.macro alignment_trap, rbase, rtemp, sym
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#ifdef CONFIG_ALIGNMENT_TRAP
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#define OFF_CR_ALIGNMENT(x) cr_alignment - x
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ldr \rtemp, [\rbase, #OFF_CR_ALIGNMENT(\sym)]
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mcr p15, 0, \rtemp, c1, c0
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#endif
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.endm
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/*
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* These are the registers used in the syscall handler, and allow us to
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* have in theory up to 7 arguments to a function - r0 to r6.
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*
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* r7 is reserved for the system call number for thumb mode.
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*
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* Note that tbl == why is intentional.
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*
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* We must set at least "tsk" and "why" when calling ret_with_reschedule.
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*/
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scno .req r7 @ syscall number
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tbl .req r8 @ syscall table pointer
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why .req r8 @ Linux syscall (!= 0)
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tsk .req r9 @ current thread_info
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/*
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* Get the system call number.
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*/
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.macro get_scno
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#ifdef CONFIG_ARM_THUMB
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tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
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addne scno, r7, #OS_NUMBER << 20 @ put OS number in
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ldreq scno, [lr, #-4]
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#else
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mask_pc lr, lr
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ldr scno, [lr, #-4] @ get SWI instruction
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#endif
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.endm
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