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' 511da177e4SLinus Torvalds bl do_notify_resume 52a6c61e9dSDaniel Jacobowitz b ret_slow_syscall @ Check work again 531da177e4SLinus Torvalds 541da177e4SLinus Torvaldswork_resched: 551da177e4SLinus Torvalds bl schedule 561da177e4SLinus Torvalds/* 571da177e4SLinus Torvalds * "slow" syscall return path. "why" tells us if this was a real syscall. 581da177e4SLinus Torvalds */ 591da177e4SLinus TorvaldsENTRY(ret_to_user) 601da177e4SLinus Torvaldsret_slow_syscall: 611ec42c0cSRussell King disable_irq @ disable interrupts 621da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] 631da177e4SLinus Torvalds tst r1, #_TIF_WORK_MASK 641da177e4SLinus Torvalds bne work_pending 651da177e4SLinus Torvaldsno_work_pending: 66f80dff9dSDan Williams /* perform architecture specific actions before user return */ 67f80dff9dSDan Williams arch_ret_to_user r1, lr 68f80dff9dSDan Williams 69b86040a5SCatalin Marinas restore_user_regs fast = 0, offset = 0 7093ed3970SCatalin MarinasENDPROC(ret_to_user) 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds/* 731da177e4SLinus Torvalds * This is how we return from a fork. 741da177e4SLinus Torvalds */ 751da177e4SLinus TorvaldsENTRY(ret_from_fork) 761da177e4SLinus Torvalds bl schedule_tail 771da177e4SLinus Torvalds get_thread_info tsk 781da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing 791da177e4SLinus Torvalds mov why, #1 801da177e4SLinus Torvalds tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? 811da177e4SLinus Torvalds beq ret_slow_syscall 821da177e4SLinus Torvalds mov r1, sp 831da177e4SLinus Torvalds mov r0, #1 @ trace exit [IP = 1] 841da177e4SLinus Torvalds bl syscall_trace 851da177e4SLinus Torvalds b ret_slow_syscall 8693ed3970SCatalin MarinasENDPROC(ret_from_fork) 871da177e4SLinus Torvalds 88fa1b4f91SAl Viro .equ NR_syscalls,0 89fa1b4f91SAl Viro#define CALL(x) .equ NR_syscalls,NR_syscalls+1 901da177e4SLinus Torvalds#include "calls.S" 91fa1b4f91SAl Viro#undef CALL 92fa1b4f91SAl Viro#define CALL(x) .long x 931da177e4SLinus Torvalds 94606576ceSSteven Rostedt#ifdef CONFIG_FUNCTION_TRACER 95686ff228SRabin Vincent/* 96686ff228SRabin Vincent * When compiling with -pg, gcc inserts a call to the mcount routine at the 97686ff228SRabin Vincent * start of every function. In mcount, apart from the function's address (in 98686ff228SRabin Vincent * lr), we need to get hold of the function's caller's address. 99686ff228SRabin Vincent * 100686ff228SRabin Vincent * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: 101686ff228SRabin Vincent * 102686ff228SRabin Vincent * bl mcount 103686ff228SRabin Vincent * 104686ff228SRabin Vincent * These versions have the limitation that in order for the mcount routine to 105686ff228SRabin Vincent * be able to determine the function's caller's address, an APCS-style frame 106686ff228SRabin Vincent * pointer (which is set up with something like the code below) is required. 107686ff228SRabin Vincent * 108686ff228SRabin Vincent * mov ip, sp 109686ff228SRabin Vincent * push {fp, ip, lr, pc} 110686ff228SRabin Vincent * sub fp, ip, #4 111686ff228SRabin Vincent * 112686ff228SRabin Vincent * With EABI, these frame pointers are not available unless -mapcs-frame is 113686ff228SRabin Vincent * specified, and if building as Thumb-2, not even then. 114686ff228SRabin Vincent * 115686ff228SRabin Vincent * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, 116686ff228SRabin Vincent * with call sites like: 117686ff228SRabin Vincent * 118686ff228SRabin Vincent * push {lr} 119686ff228SRabin Vincent * bl __gnu_mcount_nc 120686ff228SRabin Vincent * 121686ff228SRabin Vincent * With these compilers, frame pointers are not necessary. 122686ff228SRabin Vincent * 123686ff228SRabin Vincent * mcount can be thought of as a function called in the middle of a subroutine 124686ff228SRabin Vincent * call. As such, it needs to be transparent for both the caller and the 125686ff228SRabin Vincent * callee: the original lr needs to be restored when leaving mcount, and no 126686ff228SRabin Vincent * registers should be clobbered. (In the __gnu_mcount_nc implementation, we 127686ff228SRabin Vincent * clobber the ip register. This is OK because the ARM calling convention 128686ff228SRabin Vincent * allows it to be clobbered in subroutines and doesn't use it to hold 129686ff228SRabin Vincent * parameters.) 130686ff228SRabin Vincent */ 13109bfafacSRabin Vincent 13209bfafacSRabin Vincent#ifndef CONFIG_OLD_MCOUNT 13309bfafacSRabin Vincent#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) 13409bfafacSRabin Vincent#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. 13509bfafacSRabin Vincent#endif 13609bfafacSRabin Vincent#endif 13709bfafacSRabin Vincent 138014c257cSAbhishek Sagar#ifdef CONFIG_DYNAMIC_FTRACE 139014c257cSAbhishek SagarENTRY(mcount) 140014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 141014c257cSAbhishek Sagar mov r0, lr 142395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 143014c257cSAbhishek Sagar 144014c257cSAbhishek Sagar .globl mcount_call 145014c257cSAbhishek Sagarmcount_call: 146014c257cSAbhishek Sagar bl ftrace_stub 147d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 148014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 14972fa62faSRabin VincentENDPROC(mcount) 150014c257cSAbhishek Sagar 151014c257cSAbhishek SagarENTRY(ftrace_caller) 152014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 153014c257cSAbhishek Sagar ldr r1, [fp, #-4] 154014c257cSAbhishek Sagar mov r0, lr 155395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 156014c257cSAbhishek Sagar 157014c257cSAbhishek Sagar .globl ftrace_call 158014c257cSAbhishek Sagarftrace_call: 159014c257cSAbhishek Sagar bl ftrace_stub 160d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 161014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 16272fa62faSRabin VincentENDPROC(ftrace_caller) 163014c257cSAbhishek Sagar 164014c257cSAbhishek Sagar#else 165014c257cSAbhishek Sagar 166181f817eSUwe Kleine-KönigENTRY(__gnu_mcount_nc) 167181f817eSUwe Kleine-König stmdb sp!, {r0-r3, lr} 168181f817eSUwe Kleine-König ldr r0, =ftrace_trace_function 169181f817eSUwe Kleine-König ldr r2, [r0] 170a3ba87a6SRabin Vincent adr r0, .Lftrace_stub 171181f817eSUwe Kleine-König cmp r0, r2 172181f817eSUwe Kleine-König bne gnu_trace 173181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1746176d394SDmitry Artamonow mov pc, ip 175181f817eSUwe Kleine-König 176181f817eSUwe Kleine-Königgnu_trace: 177181f817eSUwe Kleine-König ldr r1, [sp, #20] @ lr of instrumented routine 178181f817eSUwe Kleine-König mov r0, lr 179181f817eSUwe Kleine-König sub r0, r0, #MCOUNT_INSN_SIZE 180a3ba87a6SRabin Vincent adr lr, BSYM(1f) 181181f817eSUwe Kleine-König mov pc, r2 182a3ba87a6SRabin Vincent1: 183181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1846176d394SDmitry Artamonow mov pc, ip 18572fa62faSRabin VincentENDPROC(__gnu_mcount_nc) 186181f817eSUwe Kleine-König 18709bfafacSRabin Vincent#ifdef CONFIG_OLD_MCOUNT 18809bfafacSRabin Vincent/* 18909bfafacSRabin Vincent * This is under an ifdef in order to force link-time errors for people trying 19009bfafacSRabin Vincent * to build with !FRAME_POINTER with a GCC which doesn't use the new-style 19109bfafacSRabin Vincent * mcount. 19209bfafacSRabin Vincent */ 193014c257cSAbhishek SagarENTRY(mcount) 194014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 195014c257cSAbhishek Sagar ldr r0, =ftrace_trace_function 196014c257cSAbhishek Sagar ldr r2, [r0] 197014c257cSAbhishek Sagar adr r0, ftrace_stub 198014c257cSAbhishek Sagar cmp r0, r2 199014c257cSAbhishek Sagar bne trace 200d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 201014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 202014c257cSAbhishek Sagar 203014c257cSAbhishek Sagartrace: 204b3c960b2SUwe Kleine-König ldr r1, [fp, #-4] @ lr of instrumented routine 205014c257cSAbhishek Sagar mov r0, lr 206395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 207014c257cSAbhishek Sagar mov lr, pc 208014c257cSAbhishek Sagar mov pc, r2 2093ef7143dSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 210014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 21172fa62faSRabin VincentENDPROC(mcount) 21209bfafacSRabin Vincent#endif 213014c257cSAbhishek Sagar 214014c257cSAbhishek Sagar#endif /* CONFIG_DYNAMIC_FTRACE */ 215014c257cSAbhishek Sagar 21672fa62faSRabin VincentENTRY(ftrace_stub) 217a3ba87a6SRabin Vincent.Lftrace_stub: 218014c257cSAbhishek Sagar mov pc, lr 21972fa62faSRabin VincentENDPROC(ftrace_stub) 220014c257cSAbhishek Sagar 221606576ceSSteven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 222014c257cSAbhishek Sagar 2231da177e4SLinus Torvalds/*============================================================================= 2241da177e4SLinus Torvalds * SWI handler 2251da177e4SLinus Torvalds *----------------------------------------------------------------------------- 2261da177e4SLinus Torvalds */ 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* If we're optimising for StrongARM the resulting code won't 2291da177e4SLinus Torvalds run on an ARM7 and we can save a couple of instructions. 2301da177e4SLinus Torvalds --pb */ 2311da177e4SLinus Torvalds#ifdef CONFIG_CPU_ARM710 2323f2829a3SNicolas Pitre#define A710(code...) code 2333f2829a3SNicolas Pitre.Larm710bug: 2341da177e4SLinus Torvalds ldmia sp, {r0 - lr}^ @ Get calling r0 - lr 2351da177e4SLinus Torvalds mov r0, r0 2361da177e4SLinus Torvalds add sp, sp, #S_FRAME_SIZE 23760ac133aSNicolas Pitre subs pc, lr, #4 2381da177e4SLinus Torvalds#else 2393f2829a3SNicolas Pitre#define A710(code...) 2401da177e4SLinus Torvalds#endif 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds .align 5 2431da177e4SLinus TorvaldsENTRY(vector_swi) 244f4dc9a4cSRussell King sub sp, sp, #S_FRAME_SIZE 245f4dc9a4cSRussell King stmia sp, {r0 - r12} @ Calling r0 - r12 246b86040a5SCatalin Marinas ARM( add r8, sp, #S_PC ) 247b86040a5SCatalin Marinas ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr 248b86040a5SCatalin Marinas THUMB( mov r8, sp ) 249b86040a5SCatalin Marinas THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr 250f4dc9a4cSRussell King mrs r8, spsr @ called from non-FIQ mode, so ok. 251f4dc9a4cSRussell King str lr, [sp, #S_PC] @ Save calling PC 252f4dc9a4cSRussell King str r8, [sp, #S_PSR] @ Save CPSR 253f4dc9a4cSRussell King str r0, [sp, #S_OLD_R0] @ Save OLD_R0 2541da177e4SLinus Torvalds zero_fp 255e0f9f4a6SRussell King 256e0f9f4a6SRussell King /* 257e0f9f4a6SRussell King * Get the system call number. 258e0f9f4a6SRussell King */ 2593f2829a3SNicolas Pitre 260dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 2613f2829a3SNicolas Pitre 262dd35afc2SNicolas Pitre /* 263dd35afc2SNicolas Pitre * If we have CONFIG_OABI_COMPAT then we need to look at the swi 264dd35afc2SNicolas Pitre * value to determine if it is an EABI or an old ABI call. 265dd35afc2SNicolas Pitre */ 266dd35afc2SNicolas Pitre#ifdef CONFIG_ARM_THUMB 267dd35afc2SNicolas Pitre tst r8, #PSR_T_BIT 268dd35afc2SNicolas Pitre movne r10, #0 @ no thumb OABI emulation 269dd35afc2SNicolas Pitre ldreq r10, [lr, #-4] @ get SWI instruction 270dd35afc2SNicolas Pitre#else 271dd35afc2SNicolas Pitre ldr r10, [lr, #-4] @ get SWI instruction 272dd35afc2SNicolas Pitre A710( and ip, r10, #0x0f000000 @ check for SWI ) 273dd35afc2SNicolas Pitre A710( teq ip, #0x0f000000 ) 274dd35afc2SNicolas Pitre A710( bne .Larm710bug ) 275dd35afc2SNicolas Pitre#endif 27626584853SCatalin Marinas#ifdef CONFIG_CPU_ENDIAN_BE8 27726584853SCatalin Marinas rev r10, r10 @ little endian instruction 27826584853SCatalin Marinas#endif 279dd35afc2SNicolas Pitre 280dd35afc2SNicolas Pitre#elif defined(CONFIG_AEABI) 281dd35afc2SNicolas Pitre 282dd35afc2SNicolas Pitre /* 283dd35afc2SNicolas Pitre * Pure EABI user space always put syscall number into scno (r7). 284dd35afc2SNicolas Pitre */ 2853f2829a3SNicolas Pitre A710( ldr ip, [lr, #-4] @ get SWI instruction ) 2863f2829a3SNicolas Pitre A710( and ip, ip, #0x0f000000 @ check for SWI ) 2873f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 2883f2829a3SNicolas Pitre A710( bne .Larm710bug ) 289dd35afc2SNicolas Pitre 2903f2829a3SNicolas Pitre#elif defined(CONFIG_ARM_THUMB) 291dd35afc2SNicolas Pitre 292dd35afc2SNicolas Pitre /* Legacy ABI only, possibly thumb mode. */ 293e0f9f4a6SRussell King tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs 294e0f9f4a6SRussell King addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in 295e0f9f4a6SRussell King ldreq scno, [lr, #-4] 296dd35afc2SNicolas Pitre 297e0f9f4a6SRussell King#else 298dd35afc2SNicolas Pitre 299dd35afc2SNicolas Pitre /* Legacy ABI only. */ 300e0f9f4a6SRussell King ldr scno, [lr, #-4] @ get SWI instruction 3013f2829a3SNicolas Pitre A710( and ip, scno, #0x0f000000 @ check for SWI ) 3023f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 3033f2829a3SNicolas Pitre A710( bne .Larm710bug ) 304dd35afc2SNicolas Pitre 305e0f9f4a6SRussell King#endif 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3081da177e4SLinus Torvalds ldr ip, __cr_alignment 3091da177e4SLinus Torvalds ldr ip, [ip] 3101da177e4SLinus Torvalds mcr p15, 0, ip, c1, c0 @ update control register 3111da177e4SLinus Torvalds#endif 3121ec42c0cSRussell King enable_irq 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds get_thread_info tsk 315dd35afc2SNicolas Pitre adr tbl, sys_call_table @ load syscall table pointer 3161da177e4SLinus Torvalds ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing 317dd35afc2SNicolas Pitre 318dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 319dd35afc2SNicolas Pitre /* 320dd35afc2SNicolas Pitre * If the swi argument is zero, this is an EABI call and we do nothing. 321dd35afc2SNicolas Pitre * 322dd35afc2SNicolas Pitre * If this is an old ABI call, get the syscall number into scno and 323dd35afc2SNicolas Pitre * get the old ABI syscall table address. 324dd35afc2SNicolas Pitre */ 325dd35afc2SNicolas Pitre bics r10, r10, #0xff000000 326dd35afc2SNicolas Pitre eorne scno, r10, #__NR_OABI_SYSCALL_BASE 327dd35afc2SNicolas Pitre ldrne tbl, =sys_oabi_call_table 328dd35afc2SNicolas Pitre#elif !defined(CONFIG_AEABI) 3291da177e4SLinus Torvalds bic scno, scno, #0xff000000 @ mask off SWI op-code 330e0f9f4a6SRussell King eor scno, scno, #__NR_SYSCALL_BASE @ check OS number 3313f2829a3SNicolas Pitre#endif 332dd35afc2SNicolas Pitre 3333f2829a3SNicolas Pitre stmdb sp!, {r4, r5} @ push fifth and sixth args 3341da177e4SLinus Torvalds tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? 3351da177e4SLinus Torvalds bne __sys_trace 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 338b86040a5SCatalin Marinas adr lr, BSYM(ret_fast_syscall) @ return address 3391da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds add r1, sp, #S_OFF 3421da177e4SLinus Torvalds2: mov why, #0 @ no longer a real syscall 343e0f9f4a6SRussell King cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) 344e0f9f4a6SRussell King eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back 3451da177e4SLinus Torvalds bcs arm_syscall 3461da177e4SLinus Torvalds b sys_ni_syscall @ not private func 34793ed3970SCatalin MarinasENDPROC(vector_swi) 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* 3501da177e4SLinus Torvalds * This is the really slow path. We're going to be doing 3511da177e4SLinus Torvalds * context switches, and waiting for our parent to respond. 3521da177e4SLinus Torvalds */ 3531da177e4SLinus Torvalds__sys_trace: 3543f471126SNicolas Pitre mov r2, scno 3551da177e4SLinus Torvalds add r1, sp, #S_OFF 3561da177e4SLinus Torvalds mov r0, #0 @ trace entry [IP = 0] 3571da177e4SLinus Torvalds bl syscall_trace 3581da177e4SLinus Torvalds 359b86040a5SCatalin Marinas adr lr, BSYM(__sys_trace_return) @ return address 3603f471126SNicolas Pitre mov scno, r0 @ syscall number (possibly new) 3611da177e4SLinus Torvalds add r1, sp, #S_R0 + S_OFF @ pointer to regs 3621da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 3631da177e4SLinus Torvalds ldmccia r1, {r0 - r3} @ have to reload r0 - r3 3641da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3651da177e4SLinus Torvalds b 2b 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds__sys_trace_return: 3681da177e4SLinus Torvalds str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 3693f471126SNicolas Pitre mov r2, scno 3701da177e4SLinus Torvalds mov r1, sp 3711da177e4SLinus Torvalds mov r0, #1 @ trace exit [IP = 1] 3721da177e4SLinus Torvalds bl syscall_trace 3731da177e4SLinus Torvalds b ret_slow_syscall 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds .align 5 3761da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3771da177e4SLinus Torvalds .type __cr_alignment, #object 3781da177e4SLinus Torvalds__cr_alignment: 3791da177e4SLinus Torvalds .word cr_alignment 3801da177e4SLinus Torvalds#endif 381dd35afc2SNicolas Pitre .ltorg 382dd35afc2SNicolas Pitre 383dd35afc2SNicolas Pitre/* 384dd35afc2SNicolas Pitre * This is the syscall table declaration for native ABI syscalls. 385dd35afc2SNicolas Pitre * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. 386dd35afc2SNicolas Pitre */ 387dd35afc2SNicolas Pitre#define ABI(native, compat) native 388dd35afc2SNicolas Pitre#ifdef CONFIG_AEABI 389dd35afc2SNicolas Pitre#define OBSOLETE(syscall) sys_ni_syscall 390dd35afc2SNicolas Pitre#else 391dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 392dd35afc2SNicolas Pitre#endif 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds .type sys_call_table, #object 3951da177e4SLinus TorvaldsENTRY(sys_call_table) 3961da177e4SLinus Torvalds#include "calls.S" 397dd35afc2SNicolas Pitre#undef ABI 398dd35afc2SNicolas Pitre#undef OBSOLETE 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds/*============================================================================ 4011da177e4SLinus Torvalds * Special system call wrappers 4021da177e4SLinus Torvalds */ 4031da177e4SLinus Torvalds@ r0 = syscall number 404567bd980SRussell King@ r8 = syscall table 4051da177e4SLinus Torvaldssys_syscall: 4065247593cSPaul Brook bic scno, r0, #__NR_OABI_SYSCALL_BASE 4071da177e4SLinus Torvalds cmp scno, #__NR_syscall - __NR_SYSCALL_BASE 4081da177e4SLinus Torvalds cmpne scno, #NR_syscalls @ check range 4091da177e4SLinus Torvalds stmloia sp, {r5, r6} @ shuffle args 4101da177e4SLinus Torvalds movlo r0, r1 4111da177e4SLinus Torvalds movlo r1, r2 4121da177e4SLinus Torvalds movlo r2, r3 4131da177e4SLinus Torvalds movlo r3, r4 4141da177e4SLinus Torvalds ldrlo pc, [tbl, scno, lsl #2] 4151da177e4SLinus Torvalds b sys_ni_syscall 41693ed3970SCatalin MarinasENDPROC(sys_syscall) 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvaldssys_fork_wrapper: 4191da177e4SLinus Torvalds add r0, sp, #S_OFF 4201da177e4SLinus Torvalds b sys_fork 42193ed3970SCatalin MarinasENDPROC(sys_fork_wrapper) 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvaldssys_vfork_wrapper: 4241da177e4SLinus Torvalds add r0, sp, #S_OFF 4251da177e4SLinus Torvalds b sys_vfork 42693ed3970SCatalin MarinasENDPROC(sys_vfork_wrapper) 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvaldssys_execve_wrapper: 4291da177e4SLinus Torvalds add r3, sp, #S_OFF 4301da177e4SLinus Torvalds b sys_execve 43193ed3970SCatalin MarinasENDPROC(sys_execve_wrapper) 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvaldssys_clone_wrapper: 4341da177e4SLinus Torvalds add ip, sp, #S_OFF 4351da177e4SLinus Torvalds str ip, [sp, #4] 4361da177e4SLinus Torvalds b sys_clone 43793ed3970SCatalin MarinasENDPROC(sys_clone_wrapper) 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvaldssys_sigreturn_wrapper: 4401da177e4SLinus Torvalds add r0, sp, #S_OFF 4411da177e4SLinus Torvalds b sys_sigreturn 44293ed3970SCatalin MarinasENDPROC(sys_sigreturn_wrapper) 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvaldssys_rt_sigreturn_wrapper: 4451da177e4SLinus Torvalds add r0, sp, #S_OFF 4461da177e4SLinus Torvalds b sys_rt_sigreturn 44793ed3970SCatalin MarinasENDPROC(sys_rt_sigreturn_wrapper) 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvaldssys_sigaltstack_wrapper: 4501da177e4SLinus Torvalds ldr r2, [sp, #S_OFF + S_SP] 4511da177e4SLinus Torvalds b do_sigaltstack 45293ed3970SCatalin MarinasENDPROC(sys_sigaltstack_wrapper) 4531da177e4SLinus Torvalds 454713c4815SNicolas Pitresys_statfs64_wrapper: 455713c4815SNicolas Pitre teq r1, #88 456713c4815SNicolas Pitre moveq r1, #84 457713c4815SNicolas Pitre b sys_statfs64 45893ed3970SCatalin MarinasENDPROC(sys_statfs64_wrapper) 459713c4815SNicolas Pitre 460713c4815SNicolas Pitresys_fstatfs64_wrapper: 461713c4815SNicolas Pitre teq r1, #88 462713c4815SNicolas Pitre moveq r1, #84 463713c4815SNicolas Pitre b sys_fstatfs64 46493ed3970SCatalin MarinasENDPROC(sys_fstatfs64_wrapper) 465713c4815SNicolas Pitre 4661da177e4SLinus Torvalds/* 4671da177e4SLinus Torvalds * Note: off_4k (r5) is always units of 4K. If we can't do the requested 4681da177e4SLinus Torvalds * offset, we return EINVAL. 4691da177e4SLinus Torvalds */ 4701da177e4SLinus Torvaldssys_mmap2: 4711da177e4SLinus Torvalds#if PAGE_SHIFT > 12 4721da177e4SLinus Torvalds tst r5, #PGOFF_MASK 4731da177e4SLinus Torvalds moveq r5, r5, lsr #PAGE_SHIFT - 12 4741da177e4SLinus Torvalds streq r5, [sp, #4] 475f8b72560SAl Viro beq sys_mmap_pgoff 4761da177e4SLinus Torvalds mov r0, #-EINVAL 4777999d8d7SRussell King mov pc, lr 4781da177e4SLinus Torvalds#else 4791da177e4SLinus Torvalds str r5, [sp, #4] 480f8b72560SAl Viro b sys_mmap_pgoff 4811da177e4SLinus Torvalds#endif 48293ed3970SCatalin MarinasENDPROC(sys_mmap2) 483687ad019SNicolas Pitre 484687ad019SNicolas Pitre#ifdef CONFIG_OABI_COMPAT 485dd35afc2SNicolas Pitre 486687ad019SNicolas Pitre/* 487687ad019SNicolas Pitre * These are syscalls with argument register differences 488687ad019SNicolas Pitre */ 489687ad019SNicolas Pitre 490687ad019SNicolas Pitresys_oabi_pread64: 491687ad019SNicolas Pitre stmia sp, {r3, r4} 492687ad019SNicolas Pitre b sys_pread64 49393ed3970SCatalin MarinasENDPROC(sys_oabi_pread64) 494687ad019SNicolas Pitre 495687ad019SNicolas Pitresys_oabi_pwrite64: 496687ad019SNicolas Pitre stmia sp, {r3, r4} 497687ad019SNicolas Pitre b sys_pwrite64 49893ed3970SCatalin MarinasENDPROC(sys_oabi_pwrite64) 499687ad019SNicolas Pitre 500687ad019SNicolas Pitresys_oabi_truncate64: 501687ad019SNicolas Pitre mov r3, r2 502687ad019SNicolas Pitre mov r2, r1 503687ad019SNicolas Pitre b sys_truncate64 50493ed3970SCatalin MarinasENDPROC(sys_oabi_truncate64) 505687ad019SNicolas Pitre 506687ad019SNicolas Pitresys_oabi_ftruncate64: 507687ad019SNicolas Pitre mov r3, r2 508687ad019SNicolas Pitre mov r2, r1 509687ad019SNicolas Pitre b sys_ftruncate64 51093ed3970SCatalin MarinasENDPROC(sys_oabi_ftruncate64) 511687ad019SNicolas Pitre 512687ad019SNicolas Pitresys_oabi_readahead: 513687ad019SNicolas Pitre str r3, [sp] 514687ad019SNicolas Pitre mov r3, r2 515687ad019SNicolas Pitre mov r2, r1 516687ad019SNicolas Pitre b sys_readahead 51793ed3970SCatalin MarinasENDPROC(sys_oabi_readahead) 518687ad019SNicolas Pitre 519dd35afc2SNicolas Pitre/* 520dd35afc2SNicolas Pitre * Let's declare a second syscall table for old ABI binaries 521dd35afc2SNicolas Pitre * using the compatibility syscall entries. 522dd35afc2SNicolas Pitre */ 523dd35afc2SNicolas Pitre#define ABI(native, compat) compat 524dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 525dd35afc2SNicolas Pitre 526dd35afc2SNicolas Pitre .type sys_oabi_call_table, #object 527dd35afc2SNicolas PitreENTRY(sys_oabi_call_table) 528dd35afc2SNicolas Pitre#include "calls.S" 529dd35afc2SNicolas Pitre#undef ABI 530dd35afc2SNicolas Pitre#undef OBSOLETE 531dd35afc2SNicolas Pitre 532687ad019SNicolas Pitre#endif 533687ad019SNicolas Pitre 534