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916cda1aa1
This adds a new system call to enable the use of guarded storage for
user space processes. The system call takes two arguments, a command
and pointer to a guarded storage control block:
s390_guarded_storage(int command, struct gs_cb *gs_cb);
The second argument is relevant only for the GS_SET_BC_CB command.
The commands in detail:
0 - GS_ENABLE
Enable the guarded storage facility for the current task. The
initial content of the guarded storage control block will be
all zeros. After the enablement the user space code can use
load-guarded-storage-controls instruction (LGSC) to load an
arbitrary control block. While a task is enabled the kernel
will save and restore the current content of the guarded
storage registers on context switch.
1 - GS_DISABLE
Disables the use of the guarded storage facility for the current
task. The kernel will cease to save and restore the content of
the guarded storage registers, the task specific content of
these registers is lost.
2 - GS_SET_BC_CB
Set a broadcast guarded storage control block. This is called
per thread and stores a specific guarded storage control block
in the task struct of the current task. This control block will
be used for the broadcast event GS_BROADCAST.
3 - GS_CLEAR_BC_CB
Clears the broadcast guarded storage control block. The guarded-
storage control block is removed from the task struct that was
established by GS_SET_BC_CB.
4 - GS_BROADCAST
Sends a broadcast to all thread siblings of the current task.
Every sibling that has established a broadcast guarded storage
control block will load this control block and will be enabled
for guarded storage. The broadcast guarded storage control block
is used up, a second broadcast without a refresh of the stored
control block with GS_SET_BC_CB will not have any effect.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
#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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extern unsigned long suspend_zero_pages;
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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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void restart_call_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 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 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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int pfn_is_nosave(unsigned long);
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void s390_early_resume(void);
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unsigned long prepare_ftrace_return(unsigned long parent, 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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DECLARE_PER_CPU(u64, mt_cycles[8]);
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void verify_facilities(void);
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void gs_load_bc_cb(struct pt_regs *regs);
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void set_fs_fixup(void);
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#endif /* _ENTRY_H */
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