From mboxrd@z Thu Jan 1 00:00:00 1970 From: wade_farnsworth@mentor.com (Wade Farnsworth) Date: Wed, 29 Feb 2012 07:35:22 -0700 Subject: [PATCH v2 1/3] ARM: add support for the generic syscall.h interface In-Reply-To: <4F4E3780.4060904@mentor.com> References: <4F44FF58.3060907@mentor.com> <4F4E3780.4060904@mentor.com> Message-ID: <4F4E37AA.5030100@mentor.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Supplying the asm-generic/syscall.h interface is a pre-requisite for HAVE_ARCH_TRACEHOOK Signed-off-by: Steven Walter Signed-off-by: Wade Farnsworth --- arch/arm/include/asm/syscall.h | 93 ++++++++++++++++++++++++++++++++++++++++ 1 files changed, 93 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/syscall.h diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h new file mode 100644 index 0000000..c334a23 --- /dev/null +++ b/arch/arm/include/asm/syscall.h @@ -0,0 +1,93 @@ +/* + * Access to user system call parameters and results + * + * See asm-generic/syscall.h for descriptions of what we must do here. + */ + +#ifndef _ASM_ARM_SYSCALL_H +#define _ASM_ARM_SYSCALL_H + +#include + +extern const unsigned long sys_call_table[]; + +static inline int syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + return task_thread_info(task)->syscall; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->ARM_r0 = regs->ARM_ORIG_r0; +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + unsigned long error = regs->ARM_r0; + return IS_ERR_VALUE(error) ? error : 0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->ARM_r0; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + regs->ARM_r0 = (long) error ? error : val; +} + +#define SYSCALL_MAX_ARGS 7 + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + if (i + n > SYSCALL_MAX_ARGS) { + unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i; + unsigned int n_bad = n + i - SYSCALL_MAX_ARGS; + pr_warning("%s called with max args %d, handling only %d\n", + __func__, i + n, SYSCALL_MAX_ARGS); + memset(args_bad, 0, n_bad * sizeof(args[0])); + n = SYSCALL_MAX_ARGS - i; + } + + if (i == 0) { + args[0] = regs->ARM_ORIG_r0; + args++; + i++; + n--; + } + + memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0])); +} + +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + const unsigned long *args) +{ + if (i + n > SYSCALL_MAX_ARGS) { + pr_warning("%s called with max args %d, handling only %d\n", + __func__, i + n, SYSCALL_MAX_ARGS); + n = SYSCALL_MAX_ARGS - i; + } + + if (i == 0) { + regs->ARM_ORIG_r0 = args[0]; + args++; + i++; + n--; + } + + memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0])); +} + +#endif /* _ASM_ARM_SYSCALL_H */ -- 1.7.0.4