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Diffstat (limited to 'arch/powerpc/include/asm/syscall.h')
| -rw-r--r-- | arch/powerpc/include/asm/syscall.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h new file mode 100644 index 000000000..ab9f3f0a8 --- /dev/null +++ b/arch/powerpc/include/asm/syscall.h @@ -0,0 +1,111 @@ +/* + * Access to user system call parameters and results + * + * Copyright (C) 2008 Red Hat, Inc. All rights reserved. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License v.2. + * + * See asm-generic/syscall.h for descriptions of what we must do here. + */ + +#ifndef _ASM_SYSCALL_H +#define _ASM_SYSCALL_H 1 + +#include <uapi/linux/audit.h> +#include <linux/sched.h> +#include <linux/thread_info.h> + +/* ftrace syscalls requires exporting the sys_call_table */ +#ifdef CONFIG_FTRACE_SYSCALLS +extern const unsigned long sys_call_table[]; +#endif /* CONFIG_FTRACE_SYSCALLS */ + +static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) +{ + /* + * Note that we are returning an int here. That means 0xffffffff, ie. + * 32-bit negative 1, will be interpreted as -1 on a 64-bit kernel. + * This is important for seccomp so that compat tasks can set r0 = -1 + * to reject the syscall. + */ + return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->gpr[3] = regs->orig_gpr3; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->gpr[3]; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + /* + * In the general case it's not obvious that we must deal with CCR + * here, as the syscall exit path will also do that for us. However + * there are some places, eg. the signal code, which check ccr to + * decide if the value in r3 is actually an error. + */ + if (error) { + regs->ccr |= 0x10000000L; + regs->gpr[3] = error; + } else { + regs->ccr &= ~0x10000000L; + regs->gpr[3] = val; + } +} + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + unsigned long val, mask = -1UL; + + BUG_ON(i + n > 6); + +#ifdef CONFIG_COMPAT + if (test_tsk_thread_flag(task, TIF_32BIT)) + mask = 0xffffffff; +#endif + while (n--) { + if (n == 0 && i == 0) + val = regs->orig_gpr3; + else + val = regs->gpr[3 + i + n]; + + args[n] = val & mask; + } +} + +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + const unsigned long *args) +{ + BUG_ON(i + n > 6); + memcpy(®s->gpr[3 + i], args, n * sizeof(args[0])); + + /* Also copy the first argument into orig_gpr3 */ + if (i == 0 && n > 0) + regs->orig_gpr3 = args[0]; +} + +static inline int syscall_get_arch(void) +{ + int arch = is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64; +#ifdef __LITTLE_ENDIAN__ + arch |= __AUDIT_ARCH_LE; +#endif + return arch; +} +#endif /* _ASM_SYSCALL_H */ |