*参照元 [#b0b06074]
#backlinks
*説明 [#e7c6ad9c]
-パス: [[linux-2.6.33/arch/arm/kernel/entry-common.S]]
-FIXME: これは何？
--説明
**引数 [#f567764a]
-
--
**返り値 [#ncf12b1d]
-
--
**参考 [#c8b425c4]
*実装 [#q2c6cca8]
.align 5
-2^5 = 32バイト境界に配置する
ENTRY(vector_swi)
-
--[[linux-2.6.33/ENTRY()]]
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} @ Calling r0 - r12
ARM( add r8, sp, #S_PC )
ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr
-
--[[linux-2.6.33/S_FRAME_SIZE]]
-
--[[linux-2.6.33/S_PC]]
-
--[[linux-2.6.33/ARM()]]
THUMB( mov r8, sp )
THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
-
--[[linux-2.6.33/store_user_sp_lr()]]
-
--[[linux-2.6.33/THUMB()]]
mrs r8, spsr @ called from non-FIQ mode, so ok.
str lr, [sp, #S_PC] @ Save calling PC
str r8, [sp, #S_PSR] @ Save CPSR
str r0, [sp, #S_OLD_R0] @ Save OLD_R0
zero_fp
-
--[[linux-2.6.33/zero_fp()]]
/*
* Get the system call number.
*/
#if defined(CONFIG_OABI_COMPAT)
-
--[[linux-2.6.33/CONFIG_OABI_COMPAT]]
/*
* If we have CONFIG_OABI_COMPAT then we need to look at the swi
* value to determine if it is an EABI or an old ABI call.
*/
#ifdef CONFIG_ARM_THUMB
-
--[[linux-2.6.33/CONFIG_ARM_THUMB]]
tst r8, #PSR_T_BIT
movne r10, #0 @ no thumb OABI emulation
ldreq r10, [lr, #-4] @ get SWI instruction
#else
ldr r10, [lr, #-4] @ get SWI instruction
A710( and ip, r10, #0x0f000000 @ check for SWI )
A710( teq ip, #0x0f000000 )
A710( bne .Larm710bug )
-
--[[linux-2.6.33/A710()]]
-
--[[linux-2.6.33/.Larm710bug()]]
#endif
#ifdef CONFIG_CPU_ENDIAN_BE8
-
--[[linux-2.6.33/CONFIG_CPU_ENDIAN_BE8]]
rev r10, r10 @ little endian instruction
#endif
#elif defined(CONFIG_AEABI)
-
--[[linux-2.6.33/CONFIG_AEABI]]
/*
* Pure EABI user space always put syscall number into scno (r7).
*/
A710( ldr ip, [lr, #-4] @ get SWI instruction )
A710( and ip, ip, #0x0f000000 @ check for SWI )
A710( teq ip, #0x0f000000 )
A710( bne .Larm710bug )
#elif defined(CONFIG_ARM_THUMB)
/* Legacy ABI only, possibly thumb mode. */
tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
ldreq scno, [lr, #-4]
#else
/* Legacy ABI only. */
ldr scno, [lr, #-4] @ get SWI instruction
A710( and ip, scno, #0x0f000000 @ check for SWI )
A710( teq ip, #0x0f000000 )
A710( bne .Larm710bug )
#endif
#ifdef CONFIG_ALIGNMENT_TRAP
-
--[[linux-2.6.33/CONFIG_ALIGNMENT_TRAP]]
ldr ip, __cr_alignment
ldr ip, [ip]
mcr p15, 0, ip, c1, c0 @ update control register
-
--[[linux-2.6.33/__cr_alignment]]
#endif
enable_irq
-
--[[linux-2.6.33/enable_irq()]]
get_thread_info tsk
-
--[[linux-2.6.33/get_thread_info()]]
adr tbl, sys_call_table @ load syscall table pointer
ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
-
--[[linux-2.6.33/sys_call_table(global)]]
-
--[[linux-2.6.33/TI_FLAGS]]
#if defined(CONFIG_OABI_COMPAT)
/*
* If the swi argument is zero, this is an EABI call and we do nothing.
*
* If this is an old ABI call, get the syscall number into scno and
* get the old ABI syscall table address.
*/
bics r10, r10, #0xff000000
eorne scno, r10, #__NR_OABI_SYSCALL_BASE
ldrne tbl, =sys_oabi_call_table
-
--[[linux-2.6.33/__NR_OABI_SYSCALL_BASE()]]
-
--[[linux-2.6.33/sys_oabi_call_table(global)]]
#elif !defined(CONFIG_AEABI)
bic scno, scno, #0xff000000 @ mask off SWI op-code
eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
#endif
stmdb sp!, {r4, r5} @ push fifth and sixth args
tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
bne __sys_trace
-
--[[linux-2.6.33/_TIF_SYSCALL_TRACE]]
-
--[[linux-2.6.33/__sys_trace()]]
cmp scno, #NR_syscalls @ check upper syscall limit
adr lr, BSYM(ret_fast_syscall) @ return address
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
-
--[[linux-2.6.33/BSYM()]]
-
--[[linux-2.6.33/ret_fast_syscall()]]
add r1, sp, #S_OFF
-
--[[linux-2.6.33/S_OFF]]
2: mov why, #0 @ no longer a real syscall
cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
-
--[[linux-2.6.33/__ARM_NR_BASE]]
-
--[[linux-2.6.33/__NR_SYSCALL_BASE]]
bcs arm_syscall
-
--[[linux-2.6.33/arm_syscall()]]
b sys_ni_syscall @ not private func
-
--[[linux-2.6.33/sys_ni_syscall()]]
ENDPROC(vector_swi)
-
--[[linux-2.6.33/ENDPROC()]]
*コメント [#rd0ea46c]
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