diff options
| -rw-r--r-- | arch/sh/include/asm/syscall.h | 10 | ||||
| -rw-r--r-- | arch/sh/include/asm/syscall_32.h | 110 | ||||
| -rw-r--r-- | arch/sh/include/asm/syscall_64.h | 6 |
3 files changed, 126 insertions, 0 deletions
diff --git a/arch/sh/include/asm/syscall.h b/arch/sh/include/asm/syscall.h new file mode 100644 index 00000000000..6a381429ee9 --- /dev/null +++ b/arch/sh/include/asm/syscall.h @@ -0,0 +1,10 @@ +#ifndef __ASM_SH_SYSCALL_H +#define __ASM_SH_SYSCALL_H + +#ifdef CONFIG_SUPERH32 +# include "syscall_32.h" +#else +# include "syscall_64.h" +#endif + +#endif /* __ASM_SH_SYSCALL_H */ diff --git a/arch/sh/include/asm/syscall_32.h b/arch/sh/include/asm/syscall_32.h new file mode 100644 index 00000000000..54773f26cd4 --- /dev/null +++ b/arch/sh/include/asm/syscall_32.h @@ -0,0 +1,110 @@ +#ifndef __ASM_SH_SYSCALL_32_H +#define __ASM_SH_SYSCALL_32_H + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <asm/ptrace.h> + +/* The system call number is given by the user in %g1 */ +static inline long syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + return (regs->tra >= 0) ? regs->regs[3] : -1L; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + /* + * XXX: This needs some thought. On SH we don't + * save away the original r0 value anywhere. + */ +} + +static inline bool syscall_has_error(struct pt_regs *regs) +{ + return (regs->sr & 0x1) ? true : false; +} +static inline void syscall_set_error(struct pt_regs *regs) +{ + regs->sr |= 0x1; +} +static inline void syscall_clear_error(struct pt_regs *regs) +{ + regs->sr &= ~0x1; +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + return syscall_has_error(regs) ? regs->regs[0] : 0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->regs[0]; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + if (error) { + syscall_set_error(regs); + regs->regs[0] = -error; + } else { + syscall_clear_error(regs); + regs->regs[0] = val; + } +} + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + /* + * Do this simply for now. If we need to start supporting + * fetching arguments from arbitrary indices, this will need some + * extra logic. Presently there are no in-tree users that depend + * on this behaviour. + */ + BUG_ON(i); + + /* Argument pattern is: R4, R5, R6, R7, R0, R1 */ + switch (n) { + case 6: args[5] = regs->regs[1]; + case 5: args[4] = regs->regs[0]; + case 4: args[3] = regs->regs[7]; + case 3: args[2] = regs->regs[6]; + case 2: args[1] = regs->regs[5]; + case 1: args[0] = regs->regs[4]; + break; + default: + BUG(); + } +} + +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + const unsigned long *args) +{ + /* Same note as above applies */ + BUG_ON(i); + + switch (n) { + case 6: regs->regs[1] = args[5]; + case 5: regs->regs[0] = args[4]; + case 4: regs->regs[7] = args[3]; + case 3: regs->regs[6] = args[2]; + case 2: regs->regs[5] = args[1]; + case 1: regs->regs[4] = args[0]; + break; + default: + BUG(); + } +} + +#endif /* __ASM_SH_SYSCALL_32_H */ diff --git a/arch/sh/include/asm/syscall_64.h b/arch/sh/include/asm/syscall_64.h new file mode 100644 index 00000000000..bcaaa8ca4d7 --- /dev/null +++ b/arch/sh/include/asm/syscall_64.h @@ -0,0 +1,6 @@ +#ifndef __ASM_SH_SYSCALL_64_H +#define __ASM_SH_SYSCALL_64_H + +#include <asm-generic/syscall.h> + +#endif /* __ASM_SH_SYSCALL_64_H */ |