11da177e4SLinus Torvalds/* 21da177e4SLinus Torvalds * linux/arch/arm/kernel/entry-common.S 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2000 Russell King 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds#include <asm/unistd.h> 12395a59d0SAbhishek Sagar#include <asm/ftrace.h> 13a09e64fbSRussell King#include <mach/entry-macro.S> 14c4c5716eSCatalin Marinas#include <asm/unwind.h> 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds#include "entry-header.S" 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds .align 5 201da177e4SLinus Torvalds/* 211da177e4SLinus Torvalds * This is the fast syscall return path. We do as little as 221da177e4SLinus Torvalds * possible here, and this includes saving r0 back into the SVC 231da177e4SLinus Torvalds * stack. 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvaldsret_fast_syscall: 26c4c5716eSCatalin Marinas UNWIND(.fnstart ) 27c4c5716eSCatalin Marinas UNWIND(.cantunwind ) 281ec42c0cSRussell King disable_irq @ disable interrupts 291da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] 301da177e4SLinus Torvalds tst r1, #_TIF_WORK_MASK 311da177e4SLinus Torvalds bne fast_work_pending 32f4dc9a4cSRussell King 33f80dff9dSDan Williams /* perform architecture specific actions before user return */ 34f80dff9dSDan Williams arch_ret_to_user r1, lr 35f80dff9dSDan Williams 36b86040a5SCatalin Marinas restore_user_regs fast = 1, offset = S_OFF 37c4c5716eSCatalin Marinas UNWIND(.fnend ) 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds/* 401da177e4SLinus Torvalds * Ok, we need to do extra processing, enter the slow path. 411da177e4SLinus Torvalds */ 421da177e4SLinus Torvaldsfast_work_pending: 431da177e4SLinus Torvalds str r0, [sp, #S_R0+S_OFF]! @ returned r0 441da177e4SLinus Torvaldswork_pending: 451da177e4SLinus Torvalds tst r1, #_TIF_NEED_RESCHED 461da177e4SLinus Torvalds bne work_resched 47d0420c83SDavid Howells tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME 481da177e4SLinus Torvalds beq no_work_pending 491da177e4SLinus Torvalds mov r0, sp @ 'regs' 501da177e4SLinus Torvalds mov r2, why @ 'syscall' 51b2b163bbSRussell King tst r1, #_TIF_SIGPENDING @ delivering a signal? 52b2b163bbSRussell King movne why, #0 @ prevent further restarts 531da177e4SLinus Torvalds bl do_notify_resume 54a6c61e9dSDaniel Jacobowitz b ret_slow_syscall @ Check work again 551da177e4SLinus Torvalds 561da177e4SLinus Torvaldswork_resched: 571da177e4SLinus Torvalds bl schedule 581da177e4SLinus Torvalds/* 591da177e4SLinus Torvalds * "slow" syscall return path. "why" tells us if this was a real syscall. 601da177e4SLinus Torvalds */ 611da177e4SLinus TorvaldsENTRY(ret_to_user) 621da177e4SLinus Torvaldsret_slow_syscall: 631ec42c0cSRussell King disable_irq @ disable interrupts 641da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] 651da177e4SLinus Torvalds tst r1, #_TIF_WORK_MASK 661da177e4SLinus Torvalds bne work_pending 671da177e4SLinus Torvaldsno_work_pending: 68f80dff9dSDan Williams /* perform architecture specific actions before user return */ 69f80dff9dSDan Williams arch_ret_to_user r1, lr 70f80dff9dSDan Williams 71b86040a5SCatalin Marinas restore_user_regs fast = 0, offset = 0 7293ed3970SCatalin MarinasENDPROC(ret_to_user) 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds/* 751da177e4SLinus Torvalds * This is how we return from a fork. 761da177e4SLinus Torvalds */ 771da177e4SLinus TorvaldsENTRY(ret_from_fork) 781da177e4SLinus Torvalds bl schedule_tail 791da177e4SLinus Torvalds get_thread_info tsk 801da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing 811da177e4SLinus Torvalds mov why, #1 821da177e4SLinus Torvalds tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? 831da177e4SLinus Torvalds beq ret_slow_syscall 841da177e4SLinus Torvalds mov r1, sp 851da177e4SLinus Torvalds mov r0, #1 @ trace exit [IP = 1] 861da177e4SLinus Torvalds bl syscall_trace 871da177e4SLinus Torvalds b ret_slow_syscall 8893ed3970SCatalin MarinasENDPROC(ret_from_fork) 891da177e4SLinus Torvalds 90fa1b4f91SAl Viro .equ NR_syscalls,0 91fa1b4f91SAl Viro#define CALL(x) .equ NR_syscalls,NR_syscalls+1 921da177e4SLinus Torvalds#include "calls.S" 93fa1b4f91SAl Viro#undef CALL 94fa1b4f91SAl Viro#define CALL(x) .long x 951da177e4SLinus Torvalds 96606576ceSSteven Rostedt#ifdef CONFIG_FUNCTION_TRACER 97686ff228SRabin Vincent/* 98686ff228SRabin Vincent * When compiling with -pg, gcc inserts a call to the mcount routine at the 99686ff228SRabin Vincent * start of every function. In mcount, apart from the function's address (in 100686ff228SRabin Vincent * lr), we need to get hold of the function's caller's address. 101686ff228SRabin Vincent * 102686ff228SRabin Vincent * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: 103686ff228SRabin Vincent * 104686ff228SRabin Vincent * bl mcount 105686ff228SRabin Vincent * 106686ff228SRabin Vincent * These versions have the limitation that in order for the mcount routine to 107686ff228SRabin Vincent * be able to determine the function's caller's address, an APCS-style frame 108686ff228SRabin Vincent * pointer (which is set up with something like the code below) is required. 109686ff228SRabin Vincent * 110686ff228SRabin Vincent * mov ip, sp 111686ff228SRabin Vincent * push {fp, ip, lr, pc} 112686ff228SRabin Vincent * sub fp, ip, #4 113686ff228SRabin Vincent * 114686ff228SRabin Vincent * With EABI, these frame pointers are not available unless -mapcs-frame is 115686ff228SRabin Vincent * specified, and if building as Thumb-2, not even then. 116686ff228SRabin Vincent * 117686ff228SRabin Vincent * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, 118686ff228SRabin Vincent * with call sites like: 119686ff228SRabin Vincent * 120686ff228SRabin Vincent * push {lr} 121686ff228SRabin Vincent * bl __gnu_mcount_nc 122686ff228SRabin Vincent * 123686ff228SRabin Vincent * With these compilers, frame pointers are not necessary. 124686ff228SRabin Vincent * 125686ff228SRabin Vincent * mcount can be thought of as a function called in the middle of a subroutine 126686ff228SRabin Vincent * call. As such, it needs to be transparent for both the caller and the 127686ff228SRabin Vincent * callee: the original lr needs to be restored when leaving mcount, and no 128686ff228SRabin Vincent * registers should be clobbered. (In the __gnu_mcount_nc implementation, we 129686ff228SRabin Vincent * clobber the ip register. This is OK because the ARM calling convention 130686ff228SRabin Vincent * allows it to be clobbered in subroutines and doesn't use it to hold 131686ff228SRabin Vincent * parameters.) 132686ff228SRabin Vincent */ 133014c257cSAbhishek Sagar#ifdef CONFIG_DYNAMIC_FTRACE 134014c257cSAbhishek SagarENTRY(mcount) 135014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 136014c257cSAbhishek Sagar mov r0, lr 137395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 138014c257cSAbhishek Sagar 139014c257cSAbhishek Sagar .globl mcount_call 140014c257cSAbhishek Sagarmcount_call: 141014c257cSAbhishek Sagar bl ftrace_stub 142d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 143014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 144014c257cSAbhishek Sagar 145014c257cSAbhishek SagarENTRY(ftrace_caller) 146014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 147014c257cSAbhishek Sagar ldr r1, [fp, #-4] 148014c257cSAbhishek Sagar mov r0, lr 149395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 150014c257cSAbhishek Sagar 151014c257cSAbhishek Sagar .globl ftrace_call 152014c257cSAbhishek Sagarftrace_call: 153014c257cSAbhishek Sagar bl ftrace_stub 154d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 155014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 156014c257cSAbhishek Sagar 157014c257cSAbhishek Sagar#else 158014c257cSAbhishek Sagar 159181f817eSUwe Kleine-KönigENTRY(__gnu_mcount_nc) 160181f817eSUwe Kleine-König stmdb sp!, {r0-r3, lr} 161181f817eSUwe Kleine-König ldr r0, =ftrace_trace_function 162181f817eSUwe Kleine-König ldr r2, [r0] 163181f817eSUwe Kleine-König adr r0, ftrace_stub 164181f817eSUwe Kleine-König cmp r0, r2 165181f817eSUwe Kleine-König bne gnu_trace 166181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1676176d394SDmitry Artamonow mov pc, ip 168181f817eSUwe Kleine-König 169181f817eSUwe Kleine-Königgnu_trace: 170181f817eSUwe Kleine-König ldr r1, [sp, #20] @ lr of instrumented routine 171181f817eSUwe Kleine-König mov r0, lr 172181f817eSUwe Kleine-König sub r0, r0, #MCOUNT_INSN_SIZE 173181f817eSUwe Kleine-König mov lr, pc 174181f817eSUwe Kleine-König mov pc, r2 175181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1766176d394SDmitry Artamonow mov pc, ip 177181f817eSUwe Kleine-König 178014c257cSAbhishek SagarENTRY(mcount) 179014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 180014c257cSAbhishek Sagar ldr r0, =ftrace_trace_function 181014c257cSAbhishek Sagar ldr r2, [r0] 182014c257cSAbhishek Sagar adr r0, ftrace_stub 183014c257cSAbhishek Sagar cmp r0, r2 184014c257cSAbhishek Sagar bne trace 185d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 186014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 187014c257cSAbhishek Sagar 188014c257cSAbhishek Sagartrace: 189b3c960b2SUwe Kleine-König ldr r1, [fp, #-4] @ lr of instrumented routine 190014c257cSAbhishek Sagar mov r0, lr 191395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 192014c257cSAbhishek Sagar mov lr, pc 193014c257cSAbhishek Sagar mov pc, r2 1943ef7143dSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 195014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 196014c257cSAbhishek Sagar 197014c257cSAbhishek Sagar#endif /* CONFIG_DYNAMIC_FTRACE */ 198014c257cSAbhishek Sagar 199014c257cSAbhishek Sagar .globl ftrace_stub 200014c257cSAbhishek Sagarftrace_stub: 201014c257cSAbhishek Sagar mov pc, lr 202014c257cSAbhishek Sagar 203606576ceSSteven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 204014c257cSAbhishek Sagar 2051da177e4SLinus Torvalds/*============================================================================= 2061da177e4SLinus Torvalds * SWI handler 2071da177e4SLinus Torvalds *----------------------------------------------------------------------------- 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /* If we're optimising for StrongARM the resulting code won't 2111da177e4SLinus Torvalds run on an ARM7 and we can save a couple of instructions. 2121da177e4SLinus Torvalds --pb */ 2131da177e4SLinus Torvalds#ifdef CONFIG_CPU_ARM710 2143f2829a3SNicolas Pitre#define A710(code...) code 2153f2829a3SNicolas Pitre.Larm710bug: 2161da177e4SLinus Torvalds ldmia sp, {r0 - lr}^ @ Get calling r0 - lr 2171da177e4SLinus Torvalds mov r0, r0 2181da177e4SLinus Torvalds add sp, sp, #S_FRAME_SIZE 21960ac133aSNicolas Pitre subs pc, lr, #4 2201da177e4SLinus Torvalds#else 2213f2829a3SNicolas Pitre#define A710(code...) 2221da177e4SLinus Torvalds#endif 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds .align 5 2251da177e4SLinus TorvaldsENTRY(vector_swi) 226f4dc9a4cSRussell King sub sp, sp, #S_FRAME_SIZE 227f4dc9a4cSRussell King stmia sp, {r0 - r12} @ Calling r0 - r12 228b86040a5SCatalin Marinas ARM( add r8, sp, #S_PC ) 229b86040a5SCatalin Marinas ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr 230b86040a5SCatalin Marinas THUMB( mov r8, sp ) 231b86040a5SCatalin Marinas THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr 232f4dc9a4cSRussell King mrs r8, spsr @ called from non-FIQ mode, so ok. 233f4dc9a4cSRussell King str lr, [sp, #S_PC] @ Save calling PC 234f4dc9a4cSRussell King str r8, [sp, #S_PSR] @ Save CPSR 235f4dc9a4cSRussell King str r0, [sp, #S_OLD_R0] @ Save OLD_R0 2361da177e4SLinus Torvalds zero_fp 237e0f9f4a6SRussell King 238e0f9f4a6SRussell King /* 239e0f9f4a6SRussell King * Get the system call number. 240e0f9f4a6SRussell King */ 2413f2829a3SNicolas Pitre 242dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 2433f2829a3SNicolas Pitre 244dd35afc2SNicolas Pitre /* 245dd35afc2SNicolas Pitre * If we have CONFIG_OABI_COMPAT then we need to look at the swi 246dd35afc2SNicolas Pitre * value to determine if it is an EABI or an old ABI call. 247dd35afc2SNicolas Pitre */ 248dd35afc2SNicolas Pitre#ifdef CONFIG_ARM_THUMB 249dd35afc2SNicolas Pitre tst r8, #PSR_T_BIT 250dd35afc2SNicolas Pitre movne r10, #0 @ no thumb OABI emulation 251dd35afc2SNicolas Pitre ldreq r10, [lr, #-4] @ get SWI instruction 252dd35afc2SNicolas Pitre#else 253dd35afc2SNicolas Pitre ldr r10, [lr, #-4] @ get SWI instruction 254dd35afc2SNicolas Pitre A710( and ip, r10, #0x0f000000 @ check for SWI ) 255dd35afc2SNicolas Pitre A710( teq ip, #0x0f000000 ) 256dd35afc2SNicolas Pitre A710( bne .Larm710bug ) 257dd35afc2SNicolas Pitre#endif 25826584853SCatalin Marinas#ifdef CONFIG_CPU_ENDIAN_BE8 25926584853SCatalin Marinas rev r10, r10 @ little endian instruction 26026584853SCatalin Marinas#endif 261dd35afc2SNicolas Pitre 262dd35afc2SNicolas Pitre#elif defined(CONFIG_AEABI) 263dd35afc2SNicolas Pitre 264dd35afc2SNicolas Pitre /* 265dd35afc2SNicolas Pitre * Pure EABI user space always put syscall number into scno (r7). 266dd35afc2SNicolas Pitre */ 2673f2829a3SNicolas Pitre A710( ldr ip, [lr, #-4] @ get SWI instruction ) 2683f2829a3SNicolas Pitre A710( and ip, ip, #0x0f000000 @ check for SWI ) 2693f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 2703f2829a3SNicolas Pitre A710( bne .Larm710bug ) 271dd35afc2SNicolas Pitre 2723f2829a3SNicolas Pitre#elif defined(CONFIG_ARM_THUMB) 273dd35afc2SNicolas Pitre 274dd35afc2SNicolas Pitre /* Legacy ABI only, possibly thumb mode. */ 275e0f9f4a6SRussell King tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs 276e0f9f4a6SRussell King addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in 277e0f9f4a6SRussell King ldreq scno, [lr, #-4] 278dd35afc2SNicolas Pitre 279e0f9f4a6SRussell King#else 280dd35afc2SNicolas Pitre 281dd35afc2SNicolas Pitre /* Legacy ABI only. */ 282e0f9f4a6SRussell King ldr scno, [lr, #-4] @ get SWI instruction 2833f2829a3SNicolas Pitre A710( and ip, scno, #0x0f000000 @ check for SWI ) 2843f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 2853f2829a3SNicolas Pitre A710( bne .Larm710bug ) 286dd35afc2SNicolas Pitre 287e0f9f4a6SRussell King#endif 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 2901da177e4SLinus Torvalds ldr ip, __cr_alignment 2911da177e4SLinus Torvalds ldr ip, [ip] 2921da177e4SLinus Torvalds mcr p15, 0, ip, c1, c0 @ update control register 2931da177e4SLinus Torvalds#endif 2941ec42c0cSRussell King enable_irq 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds get_thread_info tsk 297dd35afc2SNicolas Pitre adr tbl, sys_call_table @ load syscall table pointer 2981da177e4SLinus Torvalds ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing 299dd35afc2SNicolas Pitre 300dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 301dd35afc2SNicolas Pitre /* 302dd35afc2SNicolas Pitre * If the swi argument is zero, this is an EABI call and we do nothing. 303dd35afc2SNicolas Pitre * 304dd35afc2SNicolas Pitre * If this is an old ABI call, get the syscall number into scno and 305dd35afc2SNicolas Pitre * get the old ABI syscall table address. 306dd35afc2SNicolas Pitre */ 307dd35afc2SNicolas Pitre bics r10, r10, #0xff000000 308dd35afc2SNicolas Pitre eorne scno, r10, #__NR_OABI_SYSCALL_BASE 309dd35afc2SNicolas Pitre ldrne tbl, =sys_oabi_call_table 310dd35afc2SNicolas Pitre#elif !defined(CONFIG_AEABI) 3111da177e4SLinus Torvalds bic scno, scno, #0xff000000 @ mask off SWI op-code 312e0f9f4a6SRussell King eor scno, scno, #__NR_SYSCALL_BASE @ check OS number 3133f2829a3SNicolas Pitre#endif 314dd35afc2SNicolas Pitre 3153f2829a3SNicolas Pitre stmdb sp!, {r4, r5} @ push fifth and sixth args 3161da177e4SLinus Torvalds tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? 3171da177e4SLinus Torvalds bne __sys_trace 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 320b86040a5SCatalin Marinas adr lr, BSYM(ret_fast_syscall) @ return address 3211da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds add r1, sp, #S_OFF 3241da177e4SLinus Torvalds2: mov why, #0 @ no longer a real syscall 325e0f9f4a6SRussell King cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) 326e0f9f4a6SRussell King eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back 3271da177e4SLinus Torvalds bcs arm_syscall 3281da177e4SLinus Torvalds b sys_ni_syscall @ not private func 32993ed3970SCatalin MarinasENDPROC(vector_swi) 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* 3321da177e4SLinus Torvalds * This is the really slow path. We're going to be doing 3331da177e4SLinus Torvalds * context switches, and waiting for our parent to respond. 3341da177e4SLinus Torvalds */ 3351da177e4SLinus Torvalds__sys_trace: 3363f471126SNicolas Pitre mov r2, scno 3371da177e4SLinus Torvalds add r1, sp, #S_OFF 3381da177e4SLinus Torvalds mov r0, #0 @ trace entry [IP = 0] 3391da177e4SLinus Torvalds bl syscall_trace 3401da177e4SLinus Torvalds 341b86040a5SCatalin Marinas adr lr, BSYM(__sys_trace_return) @ return address 3423f471126SNicolas Pitre mov scno, r0 @ syscall number (possibly new) 3431da177e4SLinus Torvalds add r1, sp, #S_R0 + S_OFF @ pointer to regs 3441da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 3451da177e4SLinus Torvalds ldmccia r1, {r0 - r3} @ have to reload r0 - r3 3461da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3471da177e4SLinus Torvalds b 2b 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds__sys_trace_return: 3501da177e4SLinus Torvalds str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 3513f471126SNicolas Pitre mov r2, scno 3521da177e4SLinus Torvalds mov r1, sp 3531da177e4SLinus Torvalds mov r0, #1 @ trace exit [IP = 1] 3541da177e4SLinus Torvalds bl syscall_trace 3551da177e4SLinus Torvalds b ret_slow_syscall 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds .align 5 3581da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3591da177e4SLinus Torvalds .type __cr_alignment, #object 3601da177e4SLinus Torvalds__cr_alignment: 3611da177e4SLinus Torvalds .word cr_alignment 3621da177e4SLinus Torvalds#endif 363dd35afc2SNicolas Pitre .ltorg 364dd35afc2SNicolas Pitre 365dd35afc2SNicolas Pitre/* 366dd35afc2SNicolas Pitre * This is the syscall table declaration for native ABI syscalls. 367dd35afc2SNicolas Pitre * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. 368dd35afc2SNicolas Pitre */ 369dd35afc2SNicolas Pitre#define ABI(native, compat) native 370dd35afc2SNicolas Pitre#ifdef CONFIG_AEABI 371dd35afc2SNicolas Pitre#define OBSOLETE(syscall) sys_ni_syscall 372dd35afc2SNicolas Pitre#else 373dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 374dd35afc2SNicolas Pitre#endif 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds .type sys_call_table, #object 3771da177e4SLinus TorvaldsENTRY(sys_call_table) 3781da177e4SLinus Torvalds#include "calls.S" 379dd35afc2SNicolas Pitre#undef ABI 380dd35afc2SNicolas Pitre#undef OBSOLETE 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds/*============================================================================ 3831da177e4SLinus Torvalds * Special system call wrappers 3841da177e4SLinus Torvalds */ 3851da177e4SLinus Torvalds@ r0 = syscall number 386567bd980SRussell King@ r8 = syscall table 3871da177e4SLinus Torvaldssys_syscall: 3885247593cSPaul Brook bic scno, r0, #__NR_OABI_SYSCALL_BASE 3891da177e4SLinus Torvalds cmp scno, #__NR_syscall - __NR_SYSCALL_BASE 3901da177e4SLinus Torvalds cmpne scno, #NR_syscalls @ check range 3911da177e4SLinus Torvalds stmloia sp, {r5, r6} @ shuffle args 3921da177e4SLinus Torvalds movlo r0, r1 3931da177e4SLinus Torvalds movlo r1, r2 3941da177e4SLinus Torvalds movlo r2, r3 3951da177e4SLinus Torvalds movlo r3, r4 3961da177e4SLinus Torvalds ldrlo pc, [tbl, scno, lsl #2] 3971da177e4SLinus Torvalds b sys_ni_syscall 39893ed3970SCatalin MarinasENDPROC(sys_syscall) 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvaldssys_fork_wrapper: 4011da177e4SLinus Torvalds add r0, sp, #S_OFF 4021da177e4SLinus Torvalds b sys_fork 40393ed3970SCatalin MarinasENDPROC(sys_fork_wrapper) 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvaldssys_vfork_wrapper: 4061da177e4SLinus Torvalds add r0, sp, #S_OFF 4071da177e4SLinus Torvalds b sys_vfork 40893ed3970SCatalin MarinasENDPROC(sys_vfork_wrapper) 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvaldssys_execve_wrapper: 4111da177e4SLinus Torvalds add r3, sp, #S_OFF 4121da177e4SLinus Torvalds b sys_execve 41393ed3970SCatalin MarinasENDPROC(sys_execve_wrapper) 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvaldssys_clone_wrapper: 4161da177e4SLinus Torvalds add ip, sp, #S_OFF 4171da177e4SLinus Torvalds str ip, [sp, #4] 4181da177e4SLinus Torvalds b sys_clone 41993ed3970SCatalin MarinasENDPROC(sys_clone_wrapper) 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvaldssys_sigreturn_wrapper: 4221da177e4SLinus Torvalds add r0, sp, #S_OFF 4231da177e4SLinus Torvalds b sys_sigreturn 42493ed3970SCatalin MarinasENDPROC(sys_sigreturn_wrapper) 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvaldssys_rt_sigreturn_wrapper: 4271da177e4SLinus Torvalds add r0, sp, #S_OFF 4281da177e4SLinus Torvalds b sys_rt_sigreturn 42993ed3970SCatalin MarinasENDPROC(sys_rt_sigreturn_wrapper) 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvaldssys_sigaltstack_wrapper: 4321da177e4SLinus Torvalds ldr r2, [sp, #S_OFF + S_SP] 4331da177e4SLinus Torvalds b do_sigaltstack 43493ed3970SCatalin MarinasENDPROC(sys_sigaltstack_wrapper) 4351da177e4SLinus Torvalds 436713c4815SNicolas Pitresys_statfs64_wrapper: 437713c4815SNicolas Pitre teq r1, #88 438713c4815SNicolas Pitre moveq r1, #84 439713c4815SNicolas Pitre b sys_statfs64 44093ed3970SCatalin MarinasENDPROC(sys_statfs64_wrapper) 441713c4815SNicolas Pitre 442713c4815SNicolas Pitresys_fstatfs64_wrapper: 443713c4815SNicolas Pitre teq r1, #88 444713c4815SNicolas Pitre moveq r1, #84 445713c4815SNicolas Pitre b sys_fstatfs64 44693ed3970SCatalin MarinasENDPROC(sys_fstatfs64_wrapper) 447713c4815SNicolas Pitre 4481da177e4SLinus Torvalds/* 4491da177e4SLinus Torvalds * Note: off_4k (r5) is always units of 4K. If we can't do the requested 4501da177e4SLinus Torvalds * offset, we return EINVAL. 4511da177e4SLinus Torvalds */ 4521da177e4SLinus Torvaldssys_mmap2: 4531da177e4SLinus Torvalds#if PAGE_SHIFT > 12 4541da177e4SLinus Torvalds tst r5, #PGOFF_MASK 4551da177e4SLinus Torvalds moveq r5, r5, lsr #PAGE_SHIFT - 12 4561da177e4SLinus Torvalds streq r5, [sp, #4] 457f8b72560SAl Viro beq sys_mmap_pgoff 4581da177e4SLinus Torvalds mov r0, #-EINVAL 4597999d8d7SRussell King mov pc, lr 4601da177e4SLinus Torvalds#else 4611da177e4SLinus Torvalds str r5, [sp, #4] 462f8b72560SAl Viro b sys_mmap_pgoff 4631da177e4SLinus Torvalds#endif 46493ed3970SCatalin MarinasENDPROC(sys_mmap2) 465687ad019SNicolas Pitre 466687ad019SNicolas Pitre#ifdef CONFIG_OABI_COMPAT 467dd35afc2SNicolas Pitre 468687ad019SNicolas Pitre/* 469687ad019SNicolas Pitre * These are syscalls with argument register differences 470687ad019SNicolas Pitre */ 471687ad019SNicolas Pitre 472687ad019SNicolas Pitresys_oabi_pread64: 473687ad019SNicolas Pitre stmia sp, {r3, r4} 474687ad019SNicolas Pitre b sys_pread64 47593ed3970SCatalin MarinasENDPROC(sys_oabi_pread64) 476687ad019SNicolas Pitre 477687ad019SNicolas Pitresys_oabi_pwrite64: 478687ad019SNicolas Pitre stmia sp, {r3, r4} 479687ad019SNicolas Pitre b sys_pwrite64 48093ed3970SCatalin MarinasENDPROC(sys_oabi_pwrite64) 481687ad019SNicolas Pitre 482687ad019SNicolas Pitresys_oabi_truncate64: 483687ad019SNicolas Pitre mov r3, r2 484687ad019SNicolas Pitre mov r2, r1 485687ad019SNicolas Pitre b sys_truncate64 48693ed3970SCatalin MarinasENDPROC(sys_oabi_truncate64) 487687ad019SNicolas Pitre 488687ad019SNicolas Pitresys_oabi_ftruncate64: 489687ad019SNicolas Pitre mov r3, r2 490687ad019SNicolas Pitre mov r2, r1 491687ad019SNicolas Pitre b sys_ftruncate64 49293ed3970SCatalin MarinasENDPROC(sys_oabi_ftruncate64) 493687ad019SNicolas Pitre 494687ad019SNicolas Pitresys_oabi_readahead: 495687ad019SNicolas Pitre str r3, [sp] 496687ad019SNicolas Pitre mov r3, r2 497687ad019SNicolas Pitre mov r2, r1 498687ad019SNicolas Pitre b sys_readahead 49993ed3970SCatalin MarinasENDPROC(sys_oabi_readahead) 500687ad019SNicolas Pitre 501dd35afc2SNicolas Pitre/* 502dd35afc2SNicolas Pitre * Let's declare a second syscall table for old ABI binaries 503dd35afc2SNicolas Pitre * using the compatibility syscall entries. 504dd35afc2SNicolas Pitre */ 505dd35afc2SNicolas Pitre#define ABI(native, compat) compat 506dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 507dd35afc2SNicolas Pitre 508dd35afc2SNicolas Pitre .type sys_oabi_call_table, #object 509dd35afc2SNicolas PitreENTRY(sys_oabi_call_table) 510dd35afc2SNicolas Pitre#include "calls.S" 511dd35afc2SNicolas Pitre#undef ABI 512dd35afc2SNicolas Pitre#undef OBSOLETE 513dd35afc2SNicolas Pitre 514687ad019SNicolas Pitre#endif 515687ad019SNicolas Pitre 516