JFIF$        dd7 

Viewing File: /usr/src/kernels/5.14.0-570.30.1.el9_6.x86_64/arch/x86/include/asm/frame.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_FRAME_H
#define _ASM_X86_FRAME_H

#include <asm/asm.h>

/*
 * These are stack frame creation macros.  They should be used by every
 * callable non-leaf asm function to make kernel stack traces more reliable.
 */

#ifdef CONFIG_FRAME_POINTER

#ifdef __ASSEMBLY__

.macro FRAME_BEGIN
	push %_ASM_BP
	_ASM_MOV %_ASM_SP, %_ASM_BP
.endm

.macro FRAME_END
	pop %_ASM_BP
.endm

#ifdef CONFIG_X86_64
/*
 * This is a sneaky trick to help the unwinder find pt_regs on the stack.  The
 * frame pointer is replaced with an encoded pointer to pt_regs.  The encoding
 * is just setting the LSB, which makes it an invalid stack address and is also
 * a signal to the unwinder that it's a pt_regs pointer in disguise.
 *
 * NOTE: This macro must be used *after* PUSH_AND_CLEAR_REGS because it corrupts
 * the original rbp.
 */
.macro ENCODE_FRAME_POINTER ptregs_offset=0
	leaq 1+\ptregs_offset(%rsp), %rbp
.endm
#else /* !CONFIG_X86_64 */
/*
 * This is a sneaky trick to help the unwinder find pt_regs on the stack.  The
 * frame pointer is replaced with an encoded pointer to pt_regs.  The encoding
 * is just clearing the MSB, which makes it an invalid stack address and is also
 * a signal to the unwinder that it's a pt_regs pointer in disguise.
 *
 * NOTE: This macro must be used *after* SAVE_ALL because it corrupts the
 * original ebp.
 */
.macro ENCODE_FRAME_POINTER
	mov %esp, %ebp
	andl $0x7fffffff, %ebp
.endm
#endif /* CONFIG_X86_64 */

#else /* !__ASSEMBLY__ */

#define FRAME_BEGIN				\
	"push %" _ASM_BP "\n"			\
	_ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"

#define FRAME_END "pop %" _ASM_BP "\n"

#ifdef CONFIG_X86_64

#define ENCODE_FRAME_POINTER			\
	"lea 1(%rsp), %rbp\n\t"

static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
{
	return (unsigned long)regs + 1;
}

#else /* !CONFIG_X86_64 */

#define ENCODE_FRAME_POINTER			\
	"movl %esp, %ebp\n\t"			\
	"andl $0x7fffffff, %ebp\n\t"

static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
{
	return (unsigned long)regs & 0x7fffffff;
}

#endif /* CONFIG_X86_64 */

#endif /* __ASSEMBLY__ */

#define FRAME_OFFSET __ASM_SEL(4, 8)

#else /* !CONFIG_FRAME_POINTER */

#ifdef __ASSEMBLY__

.macro ENCODE_FRAME_POINTER ptregs_offset=0
.endm

#else /* !__ASSEMBLY */

#define ENCODE_FRAME_POINTER

static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
{
	return 0;
}

#endif

#define FRAME_BEGIN
#define FRAME_END
#define FRAME_OFFSET 0

#endif /* CONFIG_FRAME_POINTER */

#endif /* _ASM_X86_FRAME_H */
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg