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#ifndef _ASM_X86_UNWIND_HINTS_H #define _ASM_X86_UNWIND_HINTS_H #include "orc_types.h" #ifdef __ASSEMBLY__ /* * In asm, there are two kinds of code: normal C-type callable functions and * the rest. The normal callable functions can be called by other code, and * don't do anything unusual with the stack. Such normal callable functions * are annotated with the ENTRY/ENDPROC macros. Most asm code falls in this * category. In this case, no special debugging annotations are needed because * objtool can automatically generate the ORC data for the ORC unwinder to read * at runtime. * * Anything which doesn't fall into the above category, such as syscall and * interrupt handlers, tends to not be called directly by other functions, and * often does unusual non-C-function-type things with the stack pointer. Such * code needs to be annotated such that objtool can understand it. The * following CFI hint macros are for this type of code. * * These macros provide hints to objtool about the state of the stack at each * instruction. Objtool starts from the hints and follows the code flow, * making automatic CFI adjustments when it sees pushes and pops, filling out * the debuginfo as necessary. It will also warn if it sees any * inconsistencies. / .macro UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=0 type=ORC_TYPE_CALL end=0 #ifdef CONFIG_STACK_VALIDATION .Lunwind_hint_ip_\@: .pushsection .discard.unwind_hints / struct unwind_hint / .long .Lunwind_hint_ip_\@ - . .short \sp_offset .byte \sp_reg .byte \type .byte \end .balign 4 .popsection #endif .endm .macro UNWIND_HINT_EMPTY UNWIND_HINT sp_reg=ORC_REG_UNDEFINED end=1 .endm .macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 iret=0 .if \base == %rsp .if \indirect .set sp_reg, ORC_REG_SP_INDIRECT .else .set sp_reg, ORC_REG_SP .endif .elseif \base == %rbp .set sp_reg, ORC_REG_BP .elseif \base == %rdi .set sp_reg, ORC_REG_DI .elseif \base == %rdx .set sp_reg, ORC_REG_DX .elseif \base == %r10 .set sp_reg, ORC_REG_R10 .else .error "UNWIND_HINT_REGS: bad base register" .endif .set sp_offset, \offset .if \iret .set type, ORC_TYPE_REGS_IRET .elseif \extra == 0 .set type, ORC_TYPE_REGS_IRET .set sp_offset, \offset + (168) .else .set type, ORC_TYPE_REGS .endif UNWIND_HINT sp_reg=sp_reg sp_offset=sp_offset type=type .endm .macro UNWIND_HINT_IRET_REGS base=%rsp offset=0 UNWIND_HINT_REGS base=\base offset=\offset iret=1 .endm .macro UNWIND_HINT_FUNC sp_offset=8 UNWIND_HINT sp_offset=\sp_offset .endm #else /* !__ASSEMBLY__ / #define UNWIND_HINT(sp_reg, sp_offset, type, end) \ "987: \n\t" \ ".pushsection .discard.unwind_hints\n\t" \ / struct unwind_hint / \ ".long 987b - .\n\t" \ ".short " __stringify(sp_offset) "\n\t" \ ".byte " __stringify(sp_reg) "\n\t" \ ".byte " __stringify(type) "\n\t" \ ".byte " __stringify(end) "\n\t" \ ".balign 4 \n\t" \ ".popsection\n\t" #define UNWIND_HINT_SAVE UNWIND_HINT(0, 0, UNWIND_HINT_TYPE_SAVE, 0) #define UNWIND_HINT_EMPTY #define UNWIND_HINT_RESTORE UNWIND_HINT(0, 0, UNWIND_HINT_TYPE_RESTORE, 0) #endif / __ASSEMBLY__ / #endif / _ASM_X86_UNWIND_HINTS_H */

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