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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SPARC_SYSCALL_H #define __ASM_SPARC_SYSCALL_H #include <uapi/linux/audit.h> #include <linux/kernel.h> #include <linux/compat.h> #include <linux/sched.h> #include <asm/ptrace.h> #include <asm/thread_info.h> /* * The syscall table always contains 32 bit pointers since we know that the * address of the function to be called is (way) below 4GB. So the "int" * type here is what we want [need] for both 32 bit and 64 bit systems. */ extern const unsigned int sys_call_table[]; /* 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) { int syscall_p = pt_regs_is_syscall(regs); return (syscall_p ? regs->u_regs[UREG_G1] : -1L); } static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { /* XXX This needs some thought. On Sparc we don't * XXX save away the original %o0 value somewhere. * XXX Instead we hold it in register %l5 at the top * XXX level trap frame and pass this down to the signal * XXX dispatch code which is the only place that value * XXX ever was needed. */ } #ifdef CONFIG_SPARC32 static inline bool syscall_has_error(struct pt_regs *regs) { return (regs->psr & PSR_C) ? true : false; } static inline void syscall_set_error(struct pt_regs *regs) { regs->psr |= PSR_C; } static inline void syscall_clear_error(struct pt_regs *regs) { regs->psr &= ~PSR_C; } #else static inline bool syscall_has_error(struct pt_regs *regs) { return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false; } static inline void syscall_set_error(struct pt_regs *regs) { regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY); } static inline void syscall_clear_error(struct pt_regs *regs) { regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY); } #endif static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { long val = regs->u_regs[UREG_I0]; return (syscall_has_error(regs) ? -val : 0); } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { long val = regs->u_regs[UREG_I0]; return val; } 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->u_regs[UREG_I0] = -error; } else { syscall_clear_error(regs); regs->u_regs[UREG_I0] = val; } } static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned long *args) { int zero_extend = 0; unsigned int j; unsigned int n = 6; #ifdef CONFIG_SPARC64 if (test_tsk_thread_flag(task, TIF_32BIT)) zero_extend = 1; #endif for (j = 0; j < n; j++) { unsigned long val = regs->u_regs[UREG_I0 + j]; if (zero_extend) args[j] = (u32) val; else args[j] = val; } } static inline void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, const unsigned long *args) { unsigned int i; for (i = 0; i < 6; i++) regs->u_regs[UREG_I0 + i] = args[i]; } static inline int syscall_get_arch(struct task_struct *task) { #if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT) return test_tsk_thread_flag(task, TIF_32BIT) ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64; #elif defined(CONFIG_SPARC64) return AUDIT_ARCH_SPARC64; #else return AUDIT_ARCH_SPARC; #endif } #endif /* __ASM_SPARC_SYSCALL_H */
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