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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_DEBUGREG_H #define _ASM_X86_DEBUGREG_H #include <linux/bug.h> #include <uapi/asm/debugreg.h> DECLARE_PER_CPU(unsigned long, cpu_dr7); #ifndef CONFIG_PARAVIRT_XXL /* * These special macros can be used to get or set a debugging register */ #define get_debugreg(var, register) \ (var) = native_get_debugreg(register) #define set_debugreg(value, register) \ native_set_debugreg(register, value) #endif static inline unsigned long native_get_debugreg(int regno) { unsigned long val = 0; /* Damn you, gcc! */ switch (regno) { case 0: asm("mov %%db0, %0" :"=r" (val)); break; case 1: asm("mov %%db1, %0" :"=r" (val)); break; case 2: asm("mov %%db2, %0" :"=r" (val)); break; case 3: asm("mov %%db3, %0" :"=r" (val)); break; case 6: asm("mov %%db6, %0" :"=r" (val)); break; case 7: asm("mov %%db7, %0" :"=r" (val)); break; default: BUG(); } return val; } static inline void native_set_debugreg(int regno, unsigned long value) { switch (regno) { case 0: asm("mov %0, %%db0" ::"r" (value)); break; case 1: asm("mov %0, %%db1" ::"r" (value)); break; case 2: asm("mov %0, %%db2" ::"r" (value)); break; case 3: asm("mov %0, %%db3" ::"r" (value)); break; case 6: asm("mov %0, %%db6" ::"r" (value)); break; case 7: asm("mov %0, %%db7" ::"r" (value)); break; default: BUG(); } } static inline void hw_breakpoint_disable(void) { /* Zero the control register for HW Breakpoint */ set_debugreg(0UL, 7); /* Zero-out the individual HW breakpoint address registers */ set_debugreg(0UL, 0); set_debugreg(0UL, 1); set_debugreg(0UL, 2); set_debugreg(0UL, 3); } static inline int hw_breakpoint_active(void) { return __this_cpu_read(cpu_dr7) & DR_GLOBAL_ENABLE_MASK; } extern void aout_dump_debugregs(struct user *dump); extern void hw_breakpoint_restore(void); #ifdef CONFIG_X86_64 DECLARE_PER_CPU(int, debug_stack_usage); static inline void debug_stack_usage_inc(void) { __this_cpu_inc(debug_stack_usage); } static inline void debug_stack_usage_dec(void) { __this_cpu_dec(debug_stack_usage); } void debug_stack_set_zero(void); void debug_stack_reset(void); #else /* !X86_64 */ static inline void debug_stack_set_zero(void) { } static inline void debug_stack_reset(void) { } static inline void debug_stack_usage_inc(void) { } static inline void debug_stack_usage_dec(void) { } #endif /* X86_64 */ #ifdef CONFIG_CPU_SUP_AMD extern void set_dr_addr_mask(unsigned long mask, int dr); #else static inline void set_dr_addr_mask(unsigned long mask, int dr) { } #endif #endif /* _ASM_X86_DEBUGREG_H */
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