Commit 17ea375c authored by Mao Minkai's avatar Mao Minkai Committed by guzitao
Browse files

sw64: fix ftrace support 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8YR3H



--------------------------------

Modify scripts for SW64 ftrace support.

Signed-off-by: default avatarMao Minkai <maominkai@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent aa517943

scripts/recordmcount.c

+39 −0
Original line number Diff line number Diff line
@@ -52,6 +52,12 @@ 


#define R_AARCH64_CALL26	283



#ifndef EM_SW64

#define EM_SW64			0x9916

#define R_SW64_NONE		0

#define R_SW64_REFQUAD		2       /* Direct 64 bit */

#endif



static int fd_map;	/* File descriptor for file being modified. */

static int mmap_failed; /* Boolean flag. */

static char gpfx;	/* prefix for global symbol name (sometimes '_') */
@@ -326,6 +332,16 @@ static int make_nop_arm64(void *map, size_t const offset) 
	return 0;

}



static unsigned char ideal_nop4_sw64[4] = {0x5f, 0x07, 0xff, 0x43};



static int make_nop_sw64(void *map, size_t const offset)

{

	/* Convert to nop */

	ulseek(offset, SEEK_SET);

	uwrite(ideal_nop, 4);

	return 0;

}



static int write_file(const char *fname)

{

	char tmp_file[strlen(fname) + 4];
@@ -475,6 +491,21 @@ static int LARCH64_is_fake_mcount(Elf64_Rel const *rp) 
	return 1;

}



#define SW64_FAKEMCOUNT_OFFSET	4



static int sw64_is_fake_mcount(Elf64_Rel const *rp)

{

	static Elf64_Addr old_r_offset = ~(Elf64_Addr)0;

	Elf64_Addr current_r_offset = _w(rp->r_offset);

	int is_fake;



	is_fake = (old_r_offset != ~(Elf64_Addr)0) &&

		(current_r_offset - old_r_offset == SW64_FAKEMCOUNT_OFFSET);

	old_r_offset = current_r_offset;



	return is_fake;

}



/* 64-bit EM_MIPS has weird ELF64_Rela.r_info.

 * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf

 * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40]
@@ -598,6 +629,14 @@ static int do_file(char const *const fname) 
	case EM_S390:	/* reltype: e_class    */ break;

	case EM_SH:	reltype = R_SH_DIR32; gpfx = 0; break;

	case EM_SPARCV9: reltype = R_SPARC_64; break;

	case EM_SW64:

		reltype = R_SW64_REFQUAD;

		make_nop = make_nop_sw64;

		rel_type_nop = R_SW64_NONE;

		ideal_nop = ideal_nop4_sw64;

		mcount_adjust_64 = -12;

		is_fake_mcount64 = sw64_is_fake_mcount;

		break;

	case EM_X86_64:

		make_nop = make_nop_x86;

		ideal_nop = ideal_nop5_x86_64;