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} 149014c257cSAbhishek Sagar 150014c257cSAbhishek SagarENTRY(ftrace_caller) 151014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 152014c257cSAbhishek Sagar ldr r1, [fp, #-4] 153014c257cSAbhishek Sagar mov r0, lr 154395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 155014c257cSAbhishek Sagar 156014c257cSAbhishek Sagar .globl ftrace_call 157014c257cSAbhishek Sagarftrace_call: 158014c257cSAbhishek Sagar bl ftrace_stub 159d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 160014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 161014c257cSAbhishek Sagar 162014c257cSAbhishek Sagar#else 163014c257cSAbhishek Sagar 164181f817eSUwe Kleine-KönigENTRY(__gnu_mcount_nc) 165181f817eSUwe Kleine-König stmdb sp!, {r0-r3, lr} 166181f817eSUwe Kleine-König ldr r0, =ftrace_trace_function 167181f817eSUwe Kleine-König ldr r2, [r0] 168181f817eSUwe Kleine-König adr r0, ftrace_stub 169181f817eSUwe Kleine-König cmp r0, r2 170181f817eSUwe Kleine-König bne gnu_trace 171181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1726176d394SDmitry Artamonow mov pc, ip 173181f817eSUwe Kleine-König 174181f817eSUwe Kleine-Königgnu_trace: 175181f817eSUwe Kleine-König ldr r1, [sp, #20] @ lr of instrumented routine 176181f817eSUwe Kleine-König mov r0, lr 177181f817eSUwe Kleine-König sub r0, r0, #MCOUNT_INSN_SIZE 178181f817eSUwe Kleine-König mov lr, pc 179181f817eSUwe Kleine-König mov pc, r2 180181f817eSUwe Kleine-König ldmia sp!, {r0-r3, ip, lr} 1816176d394SDmitry Artamonow mov pc, ip 182181f817eSUwe Kleine-König 18309bfafacSRabin Vincent#ifdef CONFIG_OLD_MCOUNT 18409bfafacSRabin Vincent/* 18509bfafacSRabin Vincent * This is under an ifdef in order to force link-time errors for people trying 18609bfafacSRabin Vincent * to build with !FRAME_POINTER with a GCC which doesn't use the new-style 18709bfafacSRabin Vincent * mcount. 18809bfafacSRabin Vincent */ 189014c257cSAbhishek SagarENTRY(mcount) 190014c257cSAbhishek Sagar stmdb sp!, {r0-r3, lr} 191014c257cSAbhishek Sagar ldr r0, =ftrace_trace_function 192014c257cSAbhishek Sagar ldr r2, [r0] 193014c257cSAbhishek Sagar adr r0, ftrace_stub 194014c257cSAbhishek Sagar cmp r0, r2 195014c257cSAbhishek Sagar bne trace 196d4cc510cSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 197014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 198014c257cSAbhishek Sagar 199014c257cSAbhishek Sagartrace: 200b3c960b2SUwe Kleine-König ldr r1, [fp, #-4] @ lr of instrumented routine 201014c257cSAbhishek Sagar mov r0, lr 202395a59d0SAbhishek Sagar sub r0, r0, #MCOUNT_INSN_SIZE 203014c257cSAbhishek Sagar mov lr, pc 204014c257cSAbhishek Sagar mov pc, r2 2053ef7143dSUwe Kleine-König ldr lr, [fp, #-4] @ restore lr 206014c257cSAbhishek Sagar ldmia sp!, {r0-r3, pc} 20709bfafacSRabin Vincent#endif 208014c257cSAbhishek Sagar 209014c257cSAbhishek Sagar#endif /* CONFIG_DYNAMIC_FTRACE */ 210014c257cSAbhishek Sagar 211014c257cSAbhishek Sagar .globl ftrace_stub 212014c257cSAbhishek Sagarftrace_stub: 213014c257cSAbhishek Sagar mov pc, lr 214014c257cSAbhishek Sagar 215606576ceSSteven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 216014c257cSAbhishek Sagar 2171da177e4SLinus Torvalds/*============================================================================= 2181da177e4SLinus Torvalds * SWI handler 2191da177e4SLinus Torvalds *----------------------------------------------------------------------------- 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* If we're optimising for StrongARM the resulting code won't 2231da177e4SLinus Torvalds run on an ARM7 and we can save a couple of instructions. 2241da177e4SLinus Torvalds --pb */ 2251da177e4SLinus Torvalds#ifdef CONFIG_CPU_ARM710 2263f2829a3SNicolas Pitre#define A710(code...) code 2273f2829a3SNicolas Pitre.Larm710bug: 2281da177e4SLinus Torvalds ldmia sp, {r0 - lr}^ @ Get calling r0 - lr 2291da177e4SLinus Torvalds mov r0, r0 2301da177e4SLinus Torvalds add sp, sp, #S_FRAME_SIZE 23160ac133aSNicolas Pitre subs pc, lr, #4 2321da177e4SLinus Torvalds#else 2333f2829a3SNicolas Pitre#define A710(code...) 2341da177e4SLinus Torvalds#endif 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds .align 5 2371da177e4SLinus TorvaldsENTRY(vector_swi) 238f4dc9a4cSRussell King sub sp, sp, #S_FRAME_SIZE 239f4dc9a4cSRussell King stmia sp, {r0 - r12} @ Calling r0 - r12 240b86040a5SCatalin Marinas ARM( add r8, sp, #S_PC ) 241b86040a5SCatalin Marinas ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr 242b86040a5SCatalin Marinas THUMB( mov r8, sp ) 243b86040a5SCatalin Marinas THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr 244f4dc9a4cSRussell King mrs r8, spsr @ called from non-FIQ mode, so ok. 245f4dc9a4cSRussell King str lr, [sp, #S_PC] @ Save calling PC 246f4dc9a4cSRussell King str r8, [sp, #S_PSR] @ Save CPSR 247f4dc9a4cSRussell King str r0, [sp, #S_OLD_R0] @ Save OLD_R0 2481da177e4SLinus Torvalds zero_fp 249e0f9f4a6SRussell King 250e0f9f4a6SRussell King /* 251e0f9f4a6SRussell King * Get the system call number. 252e0f9f4a6SRussell King */ 2533f2829a3SNicolas Pitre 254dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 2553f2829a3SNicolas Pitre 256dd35afc2SNicolas Pitre /* 257dd35afc2SNicolas Pitre * If we have CONFIG_OABI_COMPAT then we need to look at the swi 258dd35afc2SNicolas Pitre * value to determine if it is an EABI or an old ABI call. 259dd35afc2SNicolas Pitre */ 260dd35afc2SNicolas Pitre#ifdef CONFIG_ARM_THUMB 261dd35afc2SNicolas Pitre tst r8, #PSR_T_BIT 262dd35afc2SNicolas Pitre movne r10, #0 @ no thumb OABI emulation 263dd35afc2SNicolas Pitre ldreq r10, [lr, #-4] @ get SWI instruction 264dd35afc2SNicolas Pitre#else 265dd35afc2SNicolas Pitre ldr r10, [lr, #-4] @ get SWI instruction 266dd35afc2SNicolas Pitre A710( and ip, r10, #0x0f000000 @ check for SWI ) 267dd35afc2SNicolas Pitre A710( teq ip, #0x0f000000 ) 268dd35afc2SNicolas Pitre A710( bne .Larm710bug ) 269dd35afc2SNicolas Pitre#endif 27026584853SCatalin Marinas#ifdef CONFIG_CPU_ENDIAN_BE8 27126584853SCatalin Marinas rev r10, r10 @ little endian instruction 27226584853SCatalin Marinas#endif 273dd35afc2SNicolas Pitre 274dd35afc2SNicolas Pitre#elif defined(CONFIG_AEABI) 275dd35afc2SNicolas Pitre 276dd35afc2SNicolas Pitre /* 277dd35afc2SNicolas Pitre * Pure EABI user space always put syscall number into scno (r7). 278dd35afc2SNicolas Pitre */ 2793f2829a3SNicolas Pitre A710( ldr ip, [lr, #-4] @ get SWI instruction ) 2803f2829a3SNicolas Pitre A710( and ip, ip, #0x0f000000 @ check for SWI ) 2813f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 2823f2829a3SNicolas Pitre A710( bne .Larm710bug ) 283dd35afc2SNicolas Pitre 2843f2829a3SNicolas Pitre#elif defined(CONFIG_ARM_THUMB) 285dd35afc2SNicolas Pitre 286dd35afc2SNicolas Pitre /* Legacy ABI only, possibly thumb mode. */ 287e0f9f4a6SRussell King tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs 288e0f9f4a6SRussell King addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in 289e0f9f4a6SRussell King ldreq scno, [lr, #-4] 290dd35afc2SNicolas Pitre 291e0f9f4a6SRussell King#else 292dd35afc2SNicolas Pitre 293dd35afc2SNicolas Pitre /* Legacy ABI only. */ 294e0f9f4a6SRussell King ldr scno, [lr, #-4] @ get SWI instruction 2953f2829a3SNicolas Pitre A710( and ip, scno, #0x0f000000 @ check for SWI ) 2963f2829a3SNicolas Pitre A710( teq ip, #0x0f000000 ) 2973f2829a3SNicolas Pitre A710( bne .Larm710bug ) 298dd35afc2SNicolas Pitre 299e0f9f4a6SRussell King#endif 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3021da177e4SLinus Torvalds ldr ip, __cr_alignment 3031da177e4SLinus Torvalds ldr ip, [ip] 3041da177e4SLinus Torvalds mcr p15, 0, ip, c1, c0 @ update control register 3051da177e4SLinus Torvalds#endif 3061ec42c0cSRussell King enable_irq 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds get_thread_info tsk 309dd35afc2SNicolas Pitre adr tbl, sys_call_table @ load syscall table pointer 3101da177e4SLinus Torvalds ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing 311dd35afc2SNicolas Pitre 312dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 313dd35afc2SNicolas Pitre /* 314dd35afc2SNicolas Pitre * If the swi argument is zero, this is an EABI call and we do nothing. 315dd35afc2SNicolas Pitre * 316dd35afc2SNicolas Pitre * If this is an old ABI call, get the syscall number into scno and 317dd35afc2SNicolas Pitre * get the old ABI syscall table address. 318dd35afc2SNicolas Pitre */ 319dd35afc2SNicolas Pitre bics r10, r10, #0xff000000 320dd35afc2SNicolas Pitre eorne scno, r10, #__NR_OABI_SYSCALL_BASE 321dd35afc2SNicolas Pitre ldrne tbl, =sys_oabi_call_table 322dd35afc2SNicolas Pitre#elif !defined(CONFIG_AEABI) 3231da177e4SLinus Torvalds bic scno, scno, #0xff000000 @ mask off SWI op-code 324e0f9f4a6SRussell King eor scno, scno, #__NR_SYSCALL_BASE @ check OS number 3253f2829a3SNicolas Pitre#endif 326dd35afc2SNicolas Pitre 3273f2829a3SNicolas Pitre stmdb sp!, {r4, r5} @ push fifth and sixth args 3281da177e4SLinus Torvalds tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? 3291da177e4SLinus Torvalds bne __sys_trace 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 332b86040a5SCatalin Marinas adr lr, BSYM(ret_fast_syscall) @ return address 3331da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds add r1, sp, #S_OFF 3361da177e4SLinus Torvalds2: mov why, #0 @ no longer a real syscall 337e0f9f4a6SRussell King cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) 338e0f9f4a6SRussell King eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back 3391da177e4SLinus Torvalds bcs arm_syscall 3401da177e4SLinus Torvalds b sys_ni_syscall @ not private func 34193ed3970SCatalin MarinasENDPROC(vector_swi) 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* 3441da177e4SLinus Torvalds * This is the really slow path. We're going to be doing 3451da177e4SLinus Torvalds * context switches, and waiting for our parent to respond. 3461da177e4SLinus Torvalds */ 3471da177e4SLinus Torvalds__sys_trace: 3483f471126SNicolas Pitre mov r2, scno 3491da177e4SLinus Torvalds add r1, sp, #S_OFF 3501da177e4SLinus Torvalds mov r0, #0 @ trace entry [IP = 0] 3511da177e4SLinus Torvalds bl syscall_trace 3521da177e4SLinus Torvalds 353b86040a5SCatalin Marinas adr lr, BSYM(__sys_trace_return) @ return address 3543f471126SNicolas Pitre mov scno, r0 @ syscall number (possibly new) 3551da177e4SLinus Torvalds add r1, sp, #S_R0 + S_OFF @ pointer to regs 3561da177e4SLinus Torvalds cmp scno, #NR_syscalls @ check upper syscall limit 3571da177e4SLinus Torvalds ldmccia r1, {r0 - r3} @ have to reload r0 - r3 3581da177e4SLinus Torvalds ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine 3591da177e4SLinus Torvalds b 2b 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds__sys_trace_return: 3621da177e4SLinus Torvalds str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 3633f471126SNicolas Pitre mov r2, scno 3641da177e4SLinus Torvalds mov r1, sp 3651da177e4SLinus Torvalds mov r0, #1 @ trace exit [IP = 1] 3661da177e4SLinus Torvalds bl syscall_trace 3671da177e4SLinus Torvalds b ret_slow_syscall 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds .align 5 3701da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3711da177e4SLinus Torvalds .type __cr_alignment, #object 3721da177e4SLinus Torvalds__cr_alignment: 3731da177e4SLinus Torvalds .word cr_alignment 3741da177e4SLinus Torvalds#endif 375dd35afc2SNicolas Pitre .ltorg 376dd35afc2SNicolas Pitre 377dd35afc2SNicolas Pitre/* 378dd35afc2SNicolas Pitre * This is the syscall table declaration for native ABI syscalls. 379dd35afc2SNicolas Pitre * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. 380dd35afc2SNicolas Pitre */ 381dd35afc2SNicolas Pitre#define ABI(native, compat) native 382dd35afc2SNicolas Pitre#ifdef CONFIG_AEABI 383dd35afc2SNicolas Pitre#define OBSOLETE(syscall) sys_ni_syscall 384dd35afc2SNicolas Pitre#else 385dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 386dd35afc2SNicolas Pitre#endif 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds .type sys_call_table, #object 3891da177e4SLinus TorvaldsENTRY(sys_call_table) 3901da177e4SLinus Torvalds#include "calls.S" 391dd35afc2SNicolas Pitre#undef ABI 392dd35afc2SNicolas Pitre#undef OBSOLETE 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds/*============================================================================ 3951da177e4SLinus Torvalds * Special system call wrappers 3961da177e4SLinus Torvalds */ 3971da177e4SLinus Torvalds@ r0 = syscall number 398567bd980SRussell King@ r8 = syscall table 3991da177e4SLinus Torvaldssys_syscall: 4005247593cSPaul Brook bic scno, r0, #__NR_OABI_SYSCALL_BASE 4011da177e4SLinus Torvalds cmp scno, #__NR_syscall - __NR_SYSCALL_BASE 4021da177e4SLinus Torvalds cmpne scno, #NR_syscalls @ check range 4031da177e4SLinus Torvalds stmloia sp, {r5, r6} @ shuffle args 4041da177e4SLinus Torvalds movlo r0, r1 4051da177e4SLinus Torvalds movlo r1, r2 4061da177e4SLinus Torvalds movlo r2, r3 4071da177e4SLinus Torvalds movlo r3, r4 4081da177e4SLinus Torvalds ldrlo pc, [tbl, scno, lsl #2] 4091da177e4SLinus Torvalds b sys_ni_syscall 41093ed3970SCatalin MarinasENDPROC(sys_syscall) 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvaldssys_fork_wrapper: 4131da177e4SLinus Torvalds add r0, sp, #S_OFF 4141da177e4SLinus Torvalds b sys_fork 41593ed3970SCatalin MarinasENDPROC(sys_fork_wrapper) 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvaldssys_vfork_wrapper: 4181da177e4SLinus Torvalds add r0, sp, #S_OFF 4191da177e4SLinus Torvalds b sys_vfork 42093ed3970SCatalin MarinasENDPROC(sys_vfork_wrapper) 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvaldssys_execve_wrapper: 4231da177e4SLinus Torvalds add r3, sp, #S_OFF 4241da177e4SLinus Torvalds b sys_execve 42593ed3970SCatalin MarinasENDPROC(sys_execve_wrapper) 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvaldssys_clone_wrapper: 4281da177e4SLinus Torvalds add ip, sp, #S_OFF 4291da177e4SLinus Torvalds str ip, [sp, #4] 4301da177e4SLinus Torvalds b sys_clone 43193ed3970SCatalin MarinasENDPROC(sys_clone_wrapper) 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvaldssys_sigreturn_wrapper: 4341da177e4SLinus Torvalds add r0, sp, #S_OFF 4351da177e4SLinus Torvalds b sys_sigreturn 43693ed3970SCatalin MarinasENDPROC(sys_sigreturn_wrapper) 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvaldssys_rt_sigreturn_wrapper: 4391da177e4SLinus Torvalds add r0, sp, #S_OFF 4401da177e4SLinus Torvalds b sys_rt_sigreturn 44193ed3970SCatalin MarinasENDPROC(sys_rt_sigreturn_wrapper) 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvaldssys_sigaltstack_wrapper: 4441da177e4SLinus Torvalds ldr r2, [sp, #S_OFF + S_SP] 4451da177e4SLinus Torvalds b do_sigaltstack 44693ed3970SCatalin MarinasENDPROC(sys_sigaltstack_wrapper) 4471da177e4SLinus Torvalds 448713c4815SNicolas Pitresys_statfs64_wrapper: 449713c4815SNicolas Pitre teq r1, #88 450713c4815SNicolas Pitre moveq r1, #84 451713c4815SNicolas Pitre b sys_statfs64 45293ed3970SCatalin MarinasENDPROC(sys_statfs64_wrapper) 453713c4815SNicolas Pitre 454713c4815SNicolas Pitresys_fstatfs64_wrapper: 455713c4815SNicolas Pitre teq r1, #88 456713c4815SNicolas Pitre moveq r1, #84 457713c4815SNicolas Pitre b sys_fstatfs64 45893ed3970SCatalin MarinasENDPROC(sys_fstatfs64_wrapper) 459713c4815SNicolas Pitre 4601da177e4SLinus Torvalds/* 4611da177e4SLinus Torvalds * Note: off_4k (r5) is always units of 4K. If we can't do the requested 4621da177e4SLinus Torvalds * offset, we return EINVAL. 4631da177e4SLinus Torvalds */ 4641da177e4SLinus Torvaldssys_mmap2: 4651da177e4SLinus Torvalds#if PAGE_SHIFT > 12 4661da177e4SLinus Torvalds tst r5, #PGOFF_MASK 4671da177e4SLinus Torvalds moveq r5, r5, lsr #PAGE_SHIFT - 12 4681da177e4SLinus Torvalds streq r5, [sp, #4] 469f8b72560SAl Viro beq sys_mmap_pgoff 4701da177e4SLinus Torvalds mov r0, #-EINVAL 4717999d8d7SRussell King mov pc, lr 4721da177e4SLinus Torvalds#else 4731da177e4SLinus Torvalds str r5, [sp, #4] 474f8b72560SAl Viro b sys_mmap_pgoff 4751da177e4SLinus Torvalds#endif 47693ed3970SCatalin MarinasENDPROC(sys_mmap2) 477687ad019SNicolas Pitre 478687ad019SNicolas Pitre#ifdef CONFIG_OABI_COMPAT 479dd35afc2SNicolas Pitre 480687ad019SNicolas Pitre/* 481687ad019SNicolas Pitre * These are syscalls with argument register differences 482687ad019SNicolas Pitre */ 483687ad019SNicolas Pitre 484687ad019SNicolas Pitresys_oabi_pread64: 485687ad019SNicolas Pitre stmia sp, {r3, r4} 486687ad019SNicolas Pitre b sys_pread64 48793ed3970SCatalin MarinasENDPROC(sys_oabi_pread64) 488687ad019SNicolas Pitre 489687ad019SNicolas Pitresys_oabi_pwrite64: 490687ad019SNicolas Pitre stmia sp, {r3, r4} 491687ad019SNicolas Pitre b sys_pwrite64 49293ed3970SCatalin MarinasENDPROC(sys_oabi_pwrite64) 493687ad019SNicolas Pitre 494687ad019SNicolas Pitresys_oabi_truncate64: 495687ad019SNicolas Pitre mov r3, r2 496687ad019SNicolas Pitre mov r2, r1 497687ad019SNicolas Pitre b sys_truncate64 49893ed3970SCatalin MarinasENDPROC(sys_oabi_truncate64) 499687ad019SNicolas Pitre 500687ad019SNicolas Pitresys_oabi_ftruncate64: 501687ad019SNicolas Pitre mov r3, r2 502687ad019SNicolas Pitre mov r2, r1 503687ad019SNicolas Pitre b sys_ftruncate64 50493ed3970SCatalin MarinasENDPROC(sys_oabi_ftruncate64) 505687ad019SNicolas Pitre 506687ad019SNicolas Pitresys_oabi_readahead: 507687ad019SNicolas Pitre str r3, [sp] 508687ad019SNicolas Pitre mov r3, r2 509687ad019SNicolas Pitre mov r2, r1 510687ad019SNicolas Pitre b sys_readahead 51193ed3970SCatalin MarinasENDPROC(sys_oabi_readahead) 512687ad019SNicolas Pitre 513dd35afc2SNicolas Pitre/* 514dd35afc2SNicolas Pitre * Let's declare a second syscall table for old ABI binaries 515dd35afc2SNicolas Pitre * using the compatibility syscall entries. 516dd35afc2SNicolas Pitre */ 517dd35afc2SNicolas Pitre#define ABI(native, compat) compat 518dd35afc2SNicolas Pitre#define OBSOLETE(syscall) syscall 519dd35afc2SNicolas Pitre 520dd35afc2SNicolas Pitre .type sys_oabi_call_table, #object 521dd35afc2SNicolas PitreENTRY(sys_oabi_call_table) 522dd35afc2SNicolas Pitre#include "calls.S" 523dd35afc2SNicolas Pitre#undef ABI 524dd35afc2SNicolas Pitre#undef OBSOLETE 525dd35afc2SNicolas Pitre 526687ad019SNicolas Pitre#endif 527687ad019SNicolas Pitre 528