e7b8e675d9
Most implementations of arch_syscall_addr() are the same, so create a default version in common code and move the one piece that differs (the syscall table) to asm/syscall.h. New arch ports don't have to waste time copying & pasting this simple function. The s390/sparc versions need to be different, so document why. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1264498803-17278-1-git-send-email-vapier@gentoo.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
128 lines
3 KiB
C
128 lines
3 KiB
C
#ifndef __ASM_SPARC_SYSCALL_H
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#define __ASM_SPARC_SYSCALL_H
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/ptrace.h>
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/*
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* The syscall table always contains 32 bit pointers since we know that the
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* address of the function to be called is (way) below 4GB. So the "int"
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* type here is what we want [need] for both 32 bit and 64 bit systems.
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*/
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extern const unsigned int sys_call_table[];
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/* The system call number is given by the user in %g1 */
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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int syscall_p = pt_regs_is_syscall(regs);
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return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* XXX This needs some thought. On Sparc we don't
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* XXX save away the original %o0 value somewhere.
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* XXX Instead we hold it in register %l5 at the top
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* XXX level trap frame and pass this down to the signal
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* XXX dispatch code which is the only place that value
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* XXX ever was needed.
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*/
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}
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#ifdef CONFIG_SPARC32
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static inline bool syscall_has_error(struct pt_regs *regs)
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{
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return (regs->psr & PSR_C) ? true : false;
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}
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static inline void syscall_set_error(struct pt_regs *regs)
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{
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regs->psr |= PSR_C;
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}
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static inline void syscall_clear_error(struct pt_regs *regs)
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{
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regs->psr &= ~PSR_C;
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}
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#else
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static inline bool syscall_has_error(struct pt_regs *regs)
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{
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return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
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}
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static inline void syscall_set_error(struct pt_regs *regs)
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{
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regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
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}
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static inline void syscall_clear_error(struct pt_regs *regs)
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{
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regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
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}
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#endif
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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long val = regs->u_regs[UREG_I0];
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return (syscall_has_error(regs) ? -val : 0);
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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long val = regs->u_regs[UREG_I0];
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return val;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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syscall_set_error(regs);
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regs->u_regs[UREG_I0] = -error;
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} else {
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syscall_clear_error(regs);
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regs->u_regs[UREG_I0] = val;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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int zero_extend = 0;
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unsigned int j;
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#ifdef CONFIG_SPARC64
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if (test_tsk_thread_flag(task, TIF_32BIT))
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zero_extend = 1;
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#endif
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for (j = 0; j < n; j++) {
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unsigned long val = regs->u_regs[UREG_I0 + i + j];
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if (zero_extend)
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args[j] = (u32) val;
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else
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args[j] = val;
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}
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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unsigned int j;
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for (j = 0; j < n; j++)
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regs->u_regs[UREG_I0 + i + j] = args[j];
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}
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#endif /* __ASM_SPARC_SYSCALL_H */
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