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56e62a7370
This patch converts s390 to use the generic entry infrastructure from
kernel/entry/*.
There are a few special things on s390:
- PIF_PER_TRAP is moved to TIF_PER_TRAP as the generic code doesn't
know about our PIF flags in exit_to_user_mode_loop().
- The old code had several ways to restart syscalls:
a) PIF_SYSCALL_RESTART, which was only set during execve to force a
restart after upgrading a process (usually qemu-kvm) to pgste page
table extensions.
b) PIF_SYSCALL, which is set by do_signal() to indicate that the
current syscall should be restarted. This is changed so that
do_signal() now also uses PIF_SYSCALL_RESTART. Continuing to use
PIF_SYSCALL doesn't work with the generic code, and changing it
to PIF_SYSCALL_RESTART makes PIF_SYSCALL and PIF_SYSCALL_RESTART
more unique.
- On s390 calling sys_sigreturn or sys_rt_sigreturn is implemented by
executing a svc instruction on the process stack which causes a fault.
While handling that fault the fault code sets PIF_SYSCALL to hand over
processing to the syscall code on exit to usermode.
The patch introduces PIF_SYSCALL_RET_SET, which is set if ptrace sets
a return value for a syscall. The s390x ptrace ABI uses r2 both for the
syscall number and return value, so ptrace cannot set the syscall number +
return value at the same time. The flag makes handling that a bit easier.
do_syscall() will just skip executing the syscall if PIF_SYSCALL_RET_SET
is set.
CONFIG_DEBUG_ASCE was removd in favour of the generic CONFIG_DEBUG_ENTRY.
CR1/7/13 will be checked both on kernel entry and exit to contain the
correct asces.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
198 lines
5.5 KiB
C
198 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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*/
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#ifndef _S390_PTRACE_H
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#define _S390_PTRACE_H
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#include <linux/bits.h>
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#include <uapi/asm/ptrace.h>
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#define PIF_SYSCALL 0 /* inside a system call */
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#define PIF_SYSCALL_RESTART 1 /* restart the current system call */
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#define PIF_SYSCALL_RET_SET 2 /* return value was set via ptrace */
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#define PIF_GUEST_FAULT 3 /* indicates program check in sie64a */
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#define _PIF_SYSCALL BIT(PIF_SYSCALL)
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#define _PIF_SYSCALL_RESTART BIT(PIF_SYSCALL_RESTART)
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#define _PIF_SYSCALL_RET_SET BIT(PIF_SYSCALL_RET_SET)
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#define _PIF_GUEST_FAULT BIT(PIF_GUEST_FAULT)
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#ifndef __ASSEMBLY__
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#define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
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PSW_MASK_EA | PSW_MASK_BA)
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#define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
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PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
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PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
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struct psw_bits {
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unsigned long : 1;
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unsigned long per : 1; /* PER-Mask */
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unsigned long : 3;
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unsigned long dat : 1; /* DAT Mode */
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unsigned long io : 1; /* Input/Output Mask */
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unsigned long ext : 1; /* External Mask */
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unsigned long key : 4; /* PSW Key */
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unsigned long : 1;
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unsigned long mcheck : 1; /* Machine-Check Mask */
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unsigned long wait : 1; /* Wait State */
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unsigned long pstate : 1; /* Problem State */
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unsigned long as : 2; /* Address Space Control */
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unsigned long cc : 2; /* Condition Code */
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unsigned long pm : 4; /* Program Mask */
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unsigned long ri : 1; /* Runtime Instrumentation */
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unsigned long : 6;
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unsigned long eaba : 2; /* Addressing Mode */
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unsigned long : 31;
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unsigned long ia : 64; /* Instruction Address */
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};
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enum {
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PSW_BITS_AMODE_24BIT = 0,
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PSW_BITS_AMODE_31BIT = 1,
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PSW_BITS_AMODE_64BIT = 3
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};
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enum {
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PSW_BITS_AS_PRIMARY = 0,
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PSW_BITS_AS_ACCREG = 1,
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PSW_BITS_AS_SECONDARY = 2,
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PSW_BITS_AS_HOME = 3
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};
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#define psw_bits(__psw) (*({ \
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typecheck(psw_t, __psw); \
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&(*(struct psw_bits *)(&(__psw))); \
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}))
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#define PGM_INT_CODE_MASK 0x7f
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#define PGM_INT_CODE_PER 0x80
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/*
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* The pt_regs struct defines the way the registers are stored on
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* the stack during a system call.
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*/
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struct pt_regs
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{
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union {
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user_pt_regs user_regs;
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struct {
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unsigned long args[1];
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psw_t psw;
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unsigned long gprs[NUM_GPRS];
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};
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};
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unsigned long orig_gpr2;
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unsigned int int_code;
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unsigned int int_parm;
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unsigned long int_parm_long;
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unsigned long flags;
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unsigned long cr1;
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};
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/*
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* Program event recording (PER) register set.
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*/
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struct per_regs {
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unsigned long control; /* PER control bits */
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unsigned long start; /* PER starting address */
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unsigned long end; /* PER ending address */
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};
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/*
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* PER event contains information about the cause of the last PER exception.
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*/
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struct per_event {
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unsigned short cause; /* PER code, ATMID and AI */
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unsigned long address; /* PER address */
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unsigned char paid; /* PER access identification */
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};
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/*
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* Simplified per_info structure used to decode the ptrace user space ABI.
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*/
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struct per_struct_kernel {
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unsigned long cr9; /* PER control bits */
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unsigned long cr10; /* PER starting address */
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unsigned long cr11; /* PER ending address */
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unsigned long bits; /* Obsolete software bits */
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unsigned long starting_addr; /* User specified start address */
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unsigned long ending_addr; /* User specified end address */
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unsigned short perc_atmid; /* PER trap ATMID */
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unsigned long address; /* PER trap instruction address */
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unsigned char access_id; /* PER trap access identification */
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};
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#define PER_EVENT_MASK 0xEB000000UL
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#define PER_EVENT_BRANCH 0x80000000UL
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#define PER_EVENT_IFETCH 0x40000000UL
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#define PER_EVENT_STORE 0x20000000UL
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#define PER_EVENT_STORE_REAL 0x08000000UL
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#define PER_EVENT_TRANSACTION_END 0x02000000UL
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#define PER_EVENT_NULLIFICATION 0x01000000UL
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#define PER_CONTROL_MASK 0x00e00000UL
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#define PER_CONTROL_BRANCH_ADDRESS 0x00800000UL
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#define PER_CONTROL_SUSPENSION 0x00400000UL
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#define PER_CONTROL_ALTERATION 0x00200000UL
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static inline void set_pt_regs_flag(struct pt_regs *regs, int flag)
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{
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regs->flags |= (1UL << flag);
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}
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static inline void clear_pt_regs_flag(struct pt_regs *regs, int flag)
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{
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regs->flags &= ~(1UL << flag);
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}
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static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
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{
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return !!(regs->flags & (1UL << flag));
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}
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/*
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* These are defined as per linux/ptrace.h, which see.
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*/
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#define arch_has_single_step() (1)
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#define arch_has_block_step() (1)
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#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
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#define instruction_pointer(regs) ((regs)->psw.addr)
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#define user_stack_pointer(regs)((regs)->gprs[15])
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#define profile_pc(regs) instruction_pointer(regs)
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return regs->gprs[2];
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}
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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->psw.addr = val;
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}
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int regs_query_register_offset(const char *name);
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const char *regs_query_register_name(unsigned int offset);
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unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
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unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->gprs[15];
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}
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static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
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{
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regs->gprs[2] = rc;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _S390_PTRACE_H */
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