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87d5986345
Remove set_fs support from s390. With doing this rework address space handling and simplify it. As a result address spaces are now setup like this: CPU running in | %cr1 ASCE | %cr7 ASCE | %cr13 ASCE ----------------------------|-----------|-----------|----------- user space | user | user | kernel kernel, normal execution | kernel | user | kernel kernel, kvm guest execution | gmap | user | kernel To achieve this the getcpu vdso syscall is removed in order to avoid secondary address mode and a separate vdso address space in for user space. The getcpu vdso syscall will be implemented differently with a subsequent patch. The kernel accesses user space always via secondary address space. This happens in different ways: - with mvcos in home space mode and directly read/write to secondary address space - with mvcs/mvcp in primary space mode and copy from primary space to secondary space or vice versa - with e.g. cs in secondary space mode and access secondary space Switching translation modes happens with sacf before and after instructions which access user space, like before. Lazy handling of control register reloading is removed in the hope to make everything simpler, but at the cost of making kernel entry and exit a bit slower. That is: on kernel entry the primary asce is always changed to contain the kernel asce, and on kernel exit the primary asce is changed again so it contains the user asce. In kernel mode there is only one exception to the primary asce: when kvm guests are executed the primary asce contains the gmap asce (which describes the guest address space). The primary asce is reset to kernel asce whenever kvm guest execution is interrupted, so that this doesn't has to be taken into account for any user space accesses. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ENTRY_H
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#define _ENTRY_H
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#include <linux/percpu.h>
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#include <linux/types.h>
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#include <linux/signal.h>
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#include <asm/ptrace.h>
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#include <asm/idle.h>
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extern void *restart_stack;
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void system_call(void);
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void pgm_check_handler(void);
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void ext_int_handler(void);
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void io_int_handler(void);
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void mcck_int_handler(void);
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void restart_int_handler(void);
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asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
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asmlinkage void do_syscall_trace_exit(struct pt_regs *regs);
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void do_protection_exception(struct pt_regs *regs);
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void do_dat_exception(struct pt_regs *regs);
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void do_secure_storage_access(struct pt_regs *regs);
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void do_non_secure_storage_access(struct pt_regs *regs);
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void do_secure_storage_violation(struct pt_regs *regs);
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void addressing_exception(struct pt_regs *regs);
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void data_exception(struct pt_regs *regs);
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void default_trap_handler(struct pt_regs *regs);
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void divide_exception(struct pt_regs *regs);
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void execute_exception(struct pt_regs *regs);
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void hfp_divide_exception(struct pt_regs *regs);
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void hfp_overflow_exception(struct pt_regs *regs);
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void hfp_significance_exception(struct pt_regs *regs);
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void hfp_sqrt_exception(struct pt_regs *regs);
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void hfp_underflow_exception(struct pt_regs *regs);
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void illegal_op(struct pt_regs *regs);
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void operand_exception(struct pt_regs *regs);
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void overflow_exception(struct pt_regs *regs);
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void privileged_op(struct pt_regs *regs);
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void space_switch_exception(struct pt_regs *regs);
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void special_op_exception(struct pt_regs *regs);
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void specification_exception(struct pt_regs *regs);
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void transaction_exception(struct pt_regs *regs);
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void translation_exception(struct pt_regs *regs);
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void vector_exception(struct pt_regs *regs);
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void monitor_event_exception(struct pt_regs *regs);
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void do_per_trap(struct pt_regs *regs);
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void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str);
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void syscall_trace(struct pt_regs *regs, int entryexit);
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void kernel_stack_overflow(struct pt_regs * regs);
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void do_signal(struct pt_regs *regs);
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void handle_signal32(struct ksignal *ksig, sigset_t *oldset,
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struct pt_regs *regs);
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void do_notify_resume(struct pt_regs *regs);
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void __init init_IRQ(void);
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void do_IRQ(struct pt_regs *regs, int irq);
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void do_restart(void);
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void __init startup_init(void);
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void die(struct pt_regs *regs, const char *str);
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int setup_profiling_timer(unsigned int multiplier);
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void __init time_init(void);
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unsigned long prepare_ftrace_return(unsigned long parent, unsigned long sp, unsigned long ip);
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struct s390_mmap_arg_struct;
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struct fadvise64_64_args;
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struct old_sigaction;
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long sys_rt_sigreturn(void);
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long sys_sigreturn(void);
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long sys_s390_personality(unsigned int personality);
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long sys_s390_runtime_instr(int command, int signum);
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long sys_s390_guarded_storage(int command, struct gs_cb __user *);
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long sys_s390_pci_mmio_write(unsigned long, const void __user *, size_t);
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long sys_s390_pci_mmio_read(unsigned long, void __user *, size_t);
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long sys_s390_sthyi(unsigned long function_code, void __user *buffer, u64 __user *return_code, unsigned long flags);
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DECLARE_PER_CPU(u64, mt_cycles[8]);
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void gs_load_bc_cb(struct pt_regs *regs);
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unsigned long stack_alloc(void);
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void stack_free(unsigned long stack);
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extern char kprobes_insn_page[];
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#endif /* _ENTRY_H */
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