syscall.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __ASM_SPARC_SYSCALL_H
  3#define __ASM_SPARC_SYSCALL_H
  4
  5#include <uapi/linux/audit.h>
  6#include <linux/kernel.h>
  7#include <linux/compat.h>
  8#include <linux/sched.h>
  9#include <asm/ptrace.h>
 10#include <asm/thread_info.h>
 11
 12/*
 13 * The syscall table always contains 32 bit pointers since we know that the
 14 * address of the function to be called is (way) below 4GB.  So the "int"
 15 * type here is what we want [need] for both 32 bit and 64 bit systems.
 16 */
 17extern const unsigned int sys_call_table[];
 18
 19/* The system call number is given by the user in %g1 */
 20static inline long syscall_get_nr(struct task_struct *task,
 21				  struct pt_regs *regs)
 22{
 23	int syscall_p = pt_regs_is_syscall(regs);
 24
 25	return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
 26}
 27
 28static inline void syscall_set_nr(struct task_struct *task,
 29				  struct pt_regs *regs,
 30				  int nr)
 31{
 32	/*
 33	 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
 34	 * the target task is stopped for tracing on entering syscall, so
 35	 * there is no need to have the same check syscall_get_nr() has.
 36	 */
 37	regs->u_regs[UREG_G1] = nr;
 38}
 39
 40static inline void syscall_rollback(struct task_struct *task,
 41				    struct pt_regs *regs)
 42{
 43	/* XXX This needs some thought.  On Sparc we don't
 44	 * XXX save away the original %o0 value somewhere.
 45	 * XXX Instead we hold it in register %l5 at the top
 46	 * XXX level trap frame and pass this down to the signal
 47	 * XXX dispatch code which is the only place that value
 48	 * XXX ever was needed.
 49	 */
 50}
 51
 52#ifdef CONFIG_SPARC32
 53static inline bool syscall_has_error(struct pt_regs *regs)
 54{
 55	return (regs->psr & PSR_C) ? true : false;
 56}
 57static inline void syscall_set_error(struct pt_regs *regs)
 58{
 59	regs->psr |= PSR_C;
 60}
 61static inline void syscall_clear_error(struct pt_regs *regs)
 62{
 63	regs->psr &= ~PSR_C;
 64}
 65#else
 66static inline bool syscall_has_error(struct pt_regs *regs)
 67{
 68	return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
 69}
 70static inline void syscall_set_error(struct pt_regs *regs)
 71{
 72	regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
 73}
 74static inline void syscall_clear_error(struct pt_regs *regs)
 75{
 76	regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
 77}
 78#endif
 79
 80static inline long syscall_get_error(struct task_struct *task,
 81				     struct pt_regs *regs)
 82{
 83	long val = regs->u_regs[UREG_I0];
 84
 85	return (syscall_has_error(regs) ? -val : 0);
 86}
 87
 88static inline long syscall_get_return_value(struct task_struct *task,
 89					    struct pt_regs *regs)
 90{
 91	long val = regs->u_regs[UREG_I0];
 92
 93	return val;
 94}
 95
 96static inline void syscall_set_return_value(struct task_struct *task,
 97					    struct pt_regs *regs,
 98					    int error, long val)
 99{
100	if (error) {
101		syscall_set_error(regs);
102		regs->u_regs[UREG_I0] = -error;
103	} else {
104		syscall_clear_error(regs);
105		regs->u_regs[UREG_I0] = val;
106	}
107}
108
109static inline void syscall_get_arguments(struct task_struct *task,
110					 struct pt_regs *regs,
111					 unsigned long *args)
112{
113	int zero_extend = 0;
114	unsigned int j;
115	unsigned int n = 6;
116
117#ifdef CONFIG_SPARC64
118	if (test_tsk_thread_flag(task, TIF_32BIT))
119		zero_extend = 1;
120#endif
121
122	for (j = 0; j < n; j++) {
123		unsigned long val = regs->u_regs[UREG_I0 + j];
124
125		if (zero_extend)
126			args[j] = (u32) val;
127		else
128			args[j] = val;
129	}
130}
131
132static inline void syscall_set_arguments(struct task_struct *task,
133					 struct pt_regs *regs,
134					 const unsigned long *args)
135{
136	unsigned int i;
137
138	for (i = 0; i < 6; i++)
139		regs->u_regs[UREG_I0 + i] = args[i];
140}
141
142static inline int syscall_get_arch(struct task_struct *task)
143{
144#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
145	return test_tsk_thread_flag(task, TIF_32BIT)
146		? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
147#elif defined(CONFIG_SPARC64)
148	return AUDIT_ARCH_SPARC64;
149#else
150	return AUDIT_ARCH_SPARC;
151#endif
152}
153
154#endif /* __ASM_SPARC_SYSCALL_H */