diff options
Diffstat (limited to 'arch/s390/include/asm/processor.h')
-rw-r--r-- | arch/s390/include/asm/processor.h | 252 |
1 files changed, 150 insertions, 102 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 361ef5eda468..db9982f0e8cd 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -14,62 +14,75 @@ #include <linux/bits.h> -#define CIF_MCCK_PENDING 0 /* machine check handling is pending */ -#define CIF_ASCE_PRIMARY 1 /* primary asce needs fixup / uaccess */ -#define CIF_ASCE_SECONDARY 2 /* secondary asce needs fixup / uaccess */ -#define CIF_NOHZ_DELAY 3 /* delay HZ disable for a tick */ -#define CIF_FPU 4 /* restore FPU registers */ -#define CIF_IGNORE_IRQ 5 /* ignore interrupt (for udelay) */ -#define CIF_ENABLED_WAIT 6 /* in enabled wait state */ -#define CIF_MCCK_GUEST 7 /* machine check happening in guest */ -#define CIF_DEDICATED_CPU 8 /* this CPU is dedicated */ - -#define _CIF_MCCK_PENDING BIT(CIF_MCCK_PENDING) -#define _CIF_ASCE_PRIMARY BIT(CIF_ASCE_PRIMARY) -#define _CIF_ASCE_SECONDARY BIT(CIF_ASCE_SECONDARY) +#define CIF_SIE 0 /* CPU needs SIE exit cleanup */ +#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */ +#define CIF_ENABLED_WAIT 5 /* in enabled wait state */ +#define CIF_MCCK_GUEST 6 /* machine check happening in guest */ +#define CIF_DEDICATED_CPU 7 /* this CPU is dedicated */ + +#define _CIF_SIE BIT(CIF_SIE) #define _CIF_NOHZ_DELAY BIT(CIF_NOHZ_DELAY) -#define _CIF_FPU BIT(CIF_FPU) -#define _CIF_IGNORE_IRQ BIT(CIF_IGNORE_IRQ) #define _CIF_ENABLED_WAIT BIT(CIF_ENABLED_WAIT) #define _CIF_MCCK_GUEST BIT(CIF_MCCK_GUEST) #define _CIF_DEDICATED_CPU BIT(CIF_DEDICATED_CPU) +#define RESTART_FLAG_CTLREGS _AC(1 << 0, U) + #ifndef __ASSEMBLY__ #include <linux/cpumask.h> #include <linux/linkage.h> #include <linux/irqflags.h> +#include <asm/fpu-types.h> #include <asm/cpu.h> #include <asm/page.h> #include <asm/ptrace.h> #include <asm/setup.h> #include <asm/runtime_instr.h> -#include <asm/fpu/types.h> -#include <asm/fpu/internal.h> +#include <asm/irqflags.h> + +typedef long (*sys_call_ptr_t)(struct pt_regs *regs); -static inline void set_cpu_flag(int flag) +static __always_inline void set_cpu_flag(int flag) { S390_lowcore.cpu_flags |= (1UL << flag); } -static inline void clear_cpu_flag(int flag) +static __always_inline void clear_cpu_flag(int flag) { S390_lowcore.cpu_flags &= ~(1UL << flag); } -static inline int test_cpu_flag(int flag) +static __always_inline bool test_cpu_flag(int flag) +{ + return S390_lowcore.cpu_flags & (1UL << flag); +} + +static __always_inline bool test_and_set_cpu_flag(int flag) { - return !!(S390_lowcore.cpu_flags & (1UL << flag)); + if (test_cpu_flag(flag)) + return true; + set_cpu_flag(flag); + return false; +} + +static __always_inline bool test_and_clear_cpu_flag(int flag) +{ + if (!test_cpu_flag(flag)) + return false; + clear_cpu_flag(flag); + return true; } /* * Test CIF flag of another CPU. The caller needs to ensure that * CPU hotplug can not happen, e.g. by disabling preemption. */ -static inline int test_cpu_flag_of(int flag, int cpu) +static __always_inline bool test_cpu_flag_of(int flag, int cpu) { struct lowcore *lc = lowcore_ptr[cpu]; - return !!(lc->cpu_flags & (1UL << flag)); + + return lc->cpu_flags & (1UL << flag); } #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY) @@ -84,65 +97,96 @@ void s390_update_cpu_mhz(void); void cpu_detect_mhz_feature(void); extern const struct seq_operations cpuinfo_op; -extern int sysctl_ieee_emulation_warnings; extern void execve_tail(void); -extern void __bpon(void); +unsigned long vdso_size(void); /* * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. */ -#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \ - (1UL << 31) : -PAGE_SIZE) +#define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ + _REGION3_SIZE : TASK_SIZE_MAX) #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ - (1UL << 30) : (1UL << 41)) -#define TASK_SIZE TASK_SIZE_OF(current) + (_REGION3_SIZE >> 1) : (_REGION2_SIZE >> 1)) #define TASK_SIZE_MAX (-PAGE_SIZE) -#define STACK_TOP (test_thread_flag(TIF_31BIT) ? \ - (1UL << 31) : (1UL << 42)) -#define STACK_TOP_MAX (1UL << 42) +#define VDSO_BASE (STACK_TOP + PAGE_SIZE) +#define VDSO_LIMIT (test_thread_flag(TIF_31BIT) ? _REGION3_SIZE : _REGION2_SIZE) +#define STACK_TOP (VDSO_LIMIT - vdso_size() - PAGE_SIZE) +#define STACK_TOP_MAX (_REGION2_SIZE - vdso_size() - PAGE_SIZE) #define HAVE_ARCH_PICK_MMAP_LAYOUT -typedef unsigned int mm_segment_t; +#define __stackleak_poison __stackleak_poison +static __always_inline void __stackleak_poison(unsigned long erase_low, + unsigned long erase_high, + unsigned long poison) +{ + unsigned long tmp, count; + + count = erase_high - erase_low; + if (!count) + return; + asm volatile( + " cghi %[count],8\n" + " je 2f\n" + " aghi %[count],-(8+1)\n" + " srlg %[tmp],%[count],8\n" + " ltgr %[tmp],%[tmp]\n" + " jz 1f\n" + "0: stg %[poison],0(%[addr])\n" + " mvc 8(256-8,%[addr]),0(%[addr])\n" + " la %[addr],256(%[addr])\n" + " brctg %[tmp],0b\n" + "1: stg %[poison],0(%[addr])\n" + " larl %[tmp],3f\n" + " ex %[count],0(%[tmp])\n" + " j 4f\n" + "2: stg %[poison],0(%[addr])\n" + " j 4f\n" + "3: mvc 8(1,%[addr]),0(%[addr])\n" + "4:\n" + : [addr] "+&a" (erase_low), [count] "+&d" (count), [tmp] "=&a" (tmp) + : [poison] "d" (poison) + : "memory", "cc" + ); +} /* * Thread structure */ struct thread_struct { unsigned int acrs[NUM_ACRS]; - unsigned long ksp; /* kernel stack pointer */ - unsigned long user_timer; /* task cputime in user space */ - unsigned long guest_timer; /* task cputime in kvm guest */ - unsigned long system_timer; /* task cputime in kernel space */ - unsigned long hardirq_timer; /* task cputime in hardirq context */ - unsigned long softirq_timer; /* task cputime in softirq context */ - unsigned long sys_call_table; /* system call table address */ - mm_segment_t mm_segment; - unsigned long gmap_addr; /* address of last gmap fault. */ - unsigned int gmap_write_flag; /* gmap fault write indication */ - unsigned int gmap_int_code; /* int code of last gmap fault */ - unsigned int gmap_pfault; /* signal of a pending guest pfault */ + unsigned long ksp; /* kernel stack pointer */ + unsigned long user_timer; /* task cputime in user space */ + unsigned long guest_timer; /* task cputime in kvm guest */ + unsigned long system_timer; /* task cputime in kernel space */ + unsigned long hardirq_timer; /* task cputime in hardirq context */ + unsigned long softirq_timer; /* task cputime in softirq context */ + const sys_call_ptr_t *sys_call_table; /* system call table address */ + unsigned long gmap_addr; /* address of last gmap fault. */ + unsigned int gmap_write_flag; /* gmap fault write indication */ + unsigned int gmap_int_code; /* int code of last gmap fault */ + unsigned int gmap_pfault; /* signal of a pending guest pfault */ + int ufpu_flags; /* user fpu flags */ + int kfpu_flags; /* kernel fpu flags */ + /* Per-thread information related to debugging */ - struct per_regs per_user; /* User specified PER registers */ - struct per_event per_event; /* Cause of the last PER trap */ - unsigned long per_flags; /* Flags to control debug behavior */ - unsigned int system_call; /* system call number in signal */ - unsigned long last_break; /* last breaking-event-address. */ - /* pfault_wait is used to block the process on a pfault event */ + struct per_regs per_user; /* User specified PER registers */ + struct per_event per_event; /* Cause of the last PER trap */ + unsigned long per_flags; /* Flags to control debug behavior */ + unsigned int system_call; /* system call number in signal */ + unsigned long last_break; /* last breaking-event-address. */ + /* pfault_wait is used to block the process on a pfault event */ unsigned long pfault_wait; struct list_head list; /* cpu runtime instrumentation */ struct runtime_instr_cb *ri_cb; - struct gs_cb *gs_cb; /* Current guarded storage cb */ - struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */ - unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ - /* - * Warning: 'fpu' is dynamically-sized. It *MUST* be at - * the end. - */ - struct fpu fpu; /* FP and VX register save area */ + struct gs_cb *gs_cb; /* Current guarded storage cb */ + struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */ + struct pgm_tdb trap_tdb; /* Transaction abort diagnose block */ + struct fpu ufpu; /* User FP and VX register save area */ + struct fpu kfpu; /* Kernel FP and VX register save area */ }; /* Flag to disable transactions. */ @@ -161,7 +205,7 @@ typedef struct thread_struct thread_struct; #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ - .fpu.regs = (void *) init_task.thread.fpu.fprs, \ + .last_break = 1, \ } /* @@ -178,11 +222,9 @@ typedef struct thread_struct thread_struct; regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \ regs->psw.addr = new_psw; \ regs->gprs[15] = new_stackp; \ - crst_table_downgrade(current->mm); \ execve_tail(); \ } while (0) -/* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; struct seq_file; @@ -191,13 +233,11 @@ struct pt_regs; void show_registers(struct pt_regs *regs); void show_cacheinfo(struct seq_file *m); -/* Free all resources held by a thread. */ -static inline void release_thread(struct task_struct *tsk) { } - /* Free guarded storage control block */ void guarded_storage_release(struct task_struct *tsk); +void gs_load_bc_cb(struct pt_regs *regs); -unsigned long get_wchan(struct task_struct *p); +unsigned long __get_wchan(struct task_struct *p); #define task_pt_regs(tsk) ((struct pt_regs *) \ (task_stack_page(tsk) + THREAD_SIZE) - 1) #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) @@ -206,15 +246,25 @@ unsigned long get_wchan(struct task_struct *p); /* Has task runtime instrumentation enabled ? */ #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb) -static __always_inline unsigned long current_stack_pointer(void) +/* avoid using global register due to gcc bug in versions < 8.4 */ +#define current_stack_pointer (__current_stack_pointer()) + +static __always_inline unsigned long __current_stack_pointer(void) { unsigned long sp; - asm volatile("la %0,0(15)" : "=a" (sp)); + asm volatile("lgr %0,15" : "=d" (sp)); return sp; } -static __no_kasan_or_inline unsigned short stap(void) +static __always_inline bool on_thread_stack(void) +{ + unsigned long ksp = S390_lowcore.kernel_stack; + + return !((ksp ^ current_stack_pointer) & ~(THREAD_SIZE - 1)); +} + +static __always_inline unsigned short stap(void) { unsigned short cpu_address; @@ -231,8 +281,7 @@ static inline unsigned long __ecag(unsigned int asi, unsigned char parm) { unsigned long val; - asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */ - : "=d" (val) : "a" (asi << 8 | parm)); + asm volatile("ecag %0,0,0(%1)" : "=d" (val) : "a" (asi << 8 | parm)); return val; } @@ -253,7 +302,7 @@ static inline void __load_psw(psw_t psw) * Set PSW mask to specified value, while leaving the * PSW addr pointing to the next instruction. */ -static __no_kasan_or_inline void __load_psw_mask(unsigned long mask) +static __always_inline void __load_psw_mask(unsigned long mask) { unsigned long addr; psw_t psw; @@ -279,14 +328,36 @@ static inline unsigned long __extract_psw(void) return (((unsigned long) reg1) << 32) | ((unsigned long) reg2); } -static inline void local_mcck_enable(void) +static inline unsigned long __local_mcck_save(void) { - __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); + unsigned long mask = __extract_psw(); + + __load_psw_mask(mask & ~PSW_MASK_MCHECK); + return mask & PSW_MASK_MCHECK; +} + +#define local_mcck_save(mflags) \ +do { \ + typecheck(unsigned long, mflags); \ + mflags = __local_mcck_save(); \ +} while (0) + +static inline void local_mcck_restore(unsigned long mflags) +{ + unsigned long mask = __extract_psw(); + + mask &= ~PSW_MASK_MCHECK; + __load_psw_mask(mask | mflags); } static inline void local_mcck_disable(void) { - __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK); + __local_mcck_save(); +} + +static inline void local_mcck_enable(void) +{ + __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); } /* @@ -303,11 +374,6 @@ static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) } /* - * Function to stop a processor until the next interrupt occurs - */ -void enabled_wait(void); - -/* * Function to drop a processor into disabled wait state */ static __always_inline void __noreturn disabled_wait(void) @@ -320,30 +386,12 @@ static __always_inline void __noreturn disabled_wait(void) while (1); } -/* - * Basic Machine Check/Program Check Handler. - */ - -extern void s390_base_pgm_handler(void); -extern void s390_base_ext_handler(void); - -extern void (*s390_base_pgm_handler_fn)(void); -extern void (*s390_base_ext_handler_fn)(void); - #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL -extern int memcpy_real(void *, void *, size_t); -extern void memcpy_absolute(void *, void *, size_t); - -#define mem_assign_absolute(dest, val) do { \ - __typeof__(dest) __tmp = (val); \ - \ - BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \ - memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ -} while (0) - -extern int s390_isolate_bp(void); -extern int s390_isolate_bp_guest(void); +static __always_inline bool regs_irqs_disabled(struct pt_regs *regs) +{ + return arch_irqs_disabled_flags(regs->psw.mask); +} #endif /* __ASSEMBLY__ */ |