diff options
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 35 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-header.S | 15 | ||||
| -rw-r--r-- | arch/arm/kernel/head-common.S | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/process.c | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/signal.c | 45 | ||||
| -rw-r--r-- | arch/arm/kernel/signal.h | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/smp_scu.c | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/traps.c | 8 | ||||
| -rw-r--r-- | arch/arm/kernel/unwind.c | 9 |
9 files changed, 85 insertions, 46 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 322410be573c..d2903e3bc861 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -21,6 +21,7 @@ #include <mach/entry-macro.S> #include <asm/thread_notify.h> #include <asm/unwind.h> +#include <asm/unistd.h> #include "entry-header.S" @@ -608,33 +609,33 @@ call_fpe: THUMB( add pc, r8 ) nop - W(mov) pc, lr @ CP#0 + movw_pc lr @ CP#0 W(b) do_fpe @ CP#1 (FPE) W(b) do_fpe @ CP#2 (FPE) - W(mov) pc, lr @ CP#3 + movw_pc lr @ CP#3 #ifdef CONFIG_CRUNCH b crunch_task_enable @ CP#4 (MaverickCrunch) b crunch_task_enable @ CP#5 (MaverickCrunch) b crunch_task_enable @ CP#6 (MaverickCrunch) #else - W(mov) pc, lr @ CP#4 - W(mov) pc, lr @ CP#5 - W(mov) pc, lr @ CP#6 + movw_pc lr @ CP#4 + movw_pc lr @ CP#5 + movw_pc lr @ CP#6 #endif - W(mov) pc, lr @ CP#7 - W(mov) pc, lr @ CP#8 - W(mov) pc, lr @ CP#9 + movw_pc lr @ CP#7 + movw_pc lr @ CP#8 + movw_pc lr @ CP#9 #ifdef CONFIG_VFP W(b) do_vfp @ CP#10 (VFP) W(b) do_vfp @ CP#11 (VFP) #else - W(mov) pc, lr @ CP#10 (VFP) - W(mov) pc, lr @ CP#11 (VFP) + movw_pc lr @ CP#10 (VFP) + movw_pc lr @ CP#11 (VFP) #endif - W(mov) pc, lr @ CP#12 - W(mov) pc, lr @ CP#13 - W(mov) pc, lr @ CP#14 (Debug) - W(mov) pc, lr @ CP#15 (Control) + movw_pc lr @ CP#12 + movw_pc lr @ CP#13 + movw_pc lr @ CP#14 (Debug) + movw_pc lr @ CP#15 (Control) #ifdef CONFIG_NEON .align 6 @@ -908,10 +909,10 @@ __kuser_cmpxchg: @ 0xffff0fc0 * A special ghost syscall is used for that (see traps.c). */ stmfd sp!, {r7, lr} - mov r7, #0xff00 @ 0xfff0 into r7 for EABI - orr r7, r7, #0xf0 - swi #0x9ffff0 + ldr r7, =1f @ it's 20 bits + swi __ARM_NR_cmpxchg ldmfd sp!, {r7, pc} +1: .word __ARM_NR_cmpxchg #elif __LINUX_ARM_ARCH__ < 6 diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index ac34c0d9384b..7e9ed1eea40a 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -110,6 +110,13 @@ mov \rd, sp, lsr #13 mov \rd, \rd, lsl #13 .endm + + @ + @ 32-bit wide "mov pc, reg" + @ + .macro movw_pc, reg + mov pc, \reg + .endm #else /* CONFIG_THUMB2_KERNEL */ .macro svc_exit, rpsr clrex @ clear the exclusive monitor @@ -146,6 +153,14 @@ lsr \rd, \rd, #13 mov \rd, \rd, lsl #13 .endm + + @ + @ 32-bit wide "mov pc, reg" + @ + .macro movw_pc, reg + mov pc, \reg + nop + .endm #endif /* !CONFIG_THUMB2_KERNEL */ /* diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S index 885a7214418d..b9505aa267c0 100644 --- a/arch/arm/kernel/head-common.S +++ b/arch/arm/kernel/head-common.S @@ -97,7 +97,7 @@ __error_a: bl printhex8 adr r0, str_a2 bl printascii - adr r3, 3f + adr r3, 4f ldmia r3, {r4, r5, r6} @ get machine desc list sub r4, r3, r4 @ get offset between virt&phys add r5, r5, r4 @ convert virt addresses to diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 790fbee92ec5..0d96d0171c05 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -328,6 +328,15 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start, } /* + * Fill in the task's elfregs structure for a core dump. + */ +int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) +{ + elf_core_copy_regs(elfregs, task_pt_regs(t)); + return 1; +} + +/* * fill in the fpe structure for a core dump... */ int dump_fpu (struct pt_regs *regs, struct user_fp *fp) diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 1423a3419789..e7714f367eb8 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -1,7 +1,7 @@ /* * linux/arch/arm/kernel/signal.c * - * Copyright (C) 1995-2002 Russell King + * Copyright (C) 1995-2009 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -29,6 +29,7 @@ */ #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)) #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)) +#define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE) /* * With EABI, the syscall number has to be loaded into r7. @@ -49,6 +50,18 @@ const unsigned long sigreturn_codes[7] = { }; /* + * Either we support OABI only, or we have EABI with the OABI + * compat layer enabled. In the later case we don't know if + * user space is EABI or not, and if not we must not clobber r7. + * Always using the OABI syscall solves that issue and works for + * all those cases. + */ +const unsigned long syscall_restart_code[2] = { + SWI_SYS_RESTART, /* swi __NR_restart_syscall */ + 0xe49df004, /* ldr pc, [sp], #4 */ +}; + +/* * atomically swap in the new signal mask, and wait for a signal. */ asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask) @@ -645,32 +658,16 @@ static void do_signal(struct pt_regs *regs, int syscall) regs->ARM_pc -= 4; #else u32 __user *usp; - u32 swival = __NR_restart_syscall; - regs->ARM_sp -= 12; + regs->ARM_sp -= 4; usp = (u32 __user *)regs->ARM_sp; - /* - * Either we supports OABI only, or we have - * EABI with the OABI compat layer enabled. - * In the later case we don't know if user - * space is EABI or not, and if not we must - * not clobber r7. Always using the OABI - * syscall solves that issue and works for - * all those cases. - */ - swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE; - - put_user(regs->ARM_pc, &usp[0]); - /* swi __NR_restart_syscall */ - put_user(0xef000000 | swival, &usp[1]); - /* ldr pc, [sp], #12 */ - put_user(0xe49df00c, &usp[2]); - - flush_icache_range((unsigned long)usp, - (unsigned long)(usp + 3)); - - regs->ARM_pc = regs->ARM_sp + 4; + if (put_user(regs->ARM_pc, usp) == 0) { + regs->ARM_pc = KERN_RESTART_CODE; + } else { + regs->ARM_sp += 4; + force_sigsegv(0, current); + } #endif } } diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h index 27beece15502..6fcfe8398aa4 100644 --- a/arch/arm/kernel/signal.h +++ b/arch/arm/kernel/signal.h @@ -1,12 +1,14 @@ /* * linux/arch/arm/kernel/signal.h * - * Copyright (C) 2005 Russell King. + * Copyright (C) 2005-2009 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define KERN_SIGRETURN_CODE (CONFIG_VECTORS_BASE + 0x00000500) +#define KERN_RESTART_CODE (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes)) extern const unsigned long sigreturn_codes[7]; +extern const unsigned long syscall_restart_code[2]; diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c index d3831f616ee9..9ab4149bd983 100644 --- a/arch/arm/kernel/smp_scu.c +++ b/arch/arm/kernel/smp_scu.c @@ -37,6 +37,10 @@ void __init scu_enable(void __iomem *scu_base) u32 scu_ctrl; scu_ctrl = __raw_readl(scu_base + SCU_CTRL); + /* already enabled? */ + if (scu_ctrl & 1) + return; + scu_ctrl |= 1; __raw_writel(scu_ctrl, scu_base + SCU_CTRL); diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index f838f36eb702..3f361a783f43 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -1,7 +1,7 @@ /* * linux/arch/arm/kernel/traps.c * - * Copyright (C) 1995-2002 Russell King + * Copyright (C) 1995-2009 Russell King * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds * * This program is free software; you can redistribute it and/or modify @@ -528,7 +528,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) * __kuser_cmpxchg code in entry-armv.S should be aware of its * existence. Don't ever use this from user code. */ - case 0xfff0: + case NR(cmpxchg): for (;;) { extern void do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs); @@ -573,7 +573,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) if not implemented, rather than raising SIGILL. This way the calling program can gracefully determine whether a feature is supported. */ - if (no <= 0x7ff) + if ((no & 0xffff) <= 0x7ff) return -ENOSYS; break; } @@ -751,6 +751,8 @@ void __init early_trap_init(void) */ memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, sizeof(sigreturn_codes)); + memcpy((void *)KERN_RESTART_CODE, syscall_restart_code, + sizeof(syscall_restart_code)); flush_icache_range(vectors, vectors + PAGE_SIZE); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c index 39baf1128bfa..786ac2b6914a 100644 --- a/arch/arm/kernel/unwind.c +++ b/arch/arm/kernel/unwind.c @@ -26,6 +26,15 @@ * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html */ +#if !defined (__ARM_EABI__) +#warning Your compiler does not have EABI support. +#warning ARM unwind is known to compile only with EABI compilers. +#warning Change compiler or disable ARM_UNWIND option. +#elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2) +#warning Your compiler is too buggy; it is known to not compile ARM unwind support. +#warning Change compiler or disable ARM_UNWIND option. +#endif + #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> |