[03/11] asm-generic: add generic dwarf definition
diff mbox series

Message ID 20190825132330.5015-4-changbin.du@gmail.com
State New
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Series
  • ftrace: add support for recording function parameters and return value
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Commit Message

Changbin Du Aug. 25, 2019, 1:23 p.m. UTC
Add generic DWARF constant definitions. We will use it later.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
 include/asm-generic/dwarf.h | 199 ++++++++++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)
 create mode 100644 include/asm-generic/dwarf.h

Comments

Peter Zijlstra Aug. 26, 2019, 7:42 a.m. UTC | #1
On Sun, Aug 25, 2019 at 09:23:22PM +0800, Changbin Du wrote:
> Add generic DWARF constant definitions. We will use it later.
> 
> Signed-off-by: Changbin Du <changbin.du@gmail.com>
> ---
>  include/asm-generic/dwarf.h | 199 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 199 insertions(+)
>  create mode 100644 include/asm-generic/dwarf.h
> 
> diff --git a/include/asm-generic/dwarf.h b/include/asm-generic/dwarf.h
> new file mode 100644
> index 000000000000..c705633c2a8f
> --- /dev/null
> +++ b/include/asm-generic/dwarf.h
> @@ -0,0 +1,199 @@
> +/* SPDX-License-Identifier: GPL-2.0
> + *
> + * Architecture independent definitions of DWARF.
> + *
> + * Copyright (C) 2019 Changbin Du <changbin.du@gmail.com>

You're claiming copyright on dwarf definitions? ;-)

I'm thinking only Oracle was daft enough to think stuff like that was
copyrightable.

Also; I think it would be very good to not use/depend on DWARF for this.

You really don't need all of DWARF; I'm thikning you only need a few
types; for location we already have regs_get_kernel_argument() which
has all the logic to find the n-th argument.
Changbin Du Aug. 26, 2019, 10:25 p.m. UTC | #2
Hi, Peter,

On Mon, Aug 26, 2019 at 09:42:15AM +0200, Peter Zijlstra wrote:
> On Sun, Aug 25, 2019 at 09:23:22PM +0800, Changbin Du wrote:
> > Add generic DWARF constant definitions. We will use it later.
> > 
> > Signed-off-by: Changbin Du <changbin.du@gmail.com>
> > ---
> >  include/asm-generic/dwarf.h | 199 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 199 insertions(+)
> >  create mode 100644 include/asm-generic/dwarf.h
> > 
> > diff --git a/include/asm-generic/dwarf.h b/include/asm-generic/dwarf.h
> > new file mode 100644
> > index 000000000000..c705633c2a8f
> > --- /dev/null
> > +++ b/include/asm-generic/dwarf.h
> > @@ -0,0 +1,199 @@
> > +/* SPDX-License-Identifier: GPL-2.0
> > + *
> > + * Architecture independent definitions of DWARF.
> > + *
> > + * Copyright (C) 2019 Changbin Du <changbin.du@gmail.com>
> 
> You're claiming copyright on dwarf definitions? ;-)
> 
> I'm thinking only Oracle was daft enough to think stuff like that was
> copyrightable.
> 
ok, let me remove copyright line. I think SPDX claim is okay, right?

> Also; I think it would be very good to not use/depend on DWARF for this.
>
It only includes the DWARF expersion opcodes, not all of dwarf stuffs.

> You really don't need all of DWARF; I'm thikning you only need a few
> types; for location we already have regs_get_kernel_argument() which
> has all the logic to find the n-th argument.
> 
regs_get_kernel_argument() can handle most cases, but if the size of one paramater
exceeds 64bit (it is rare in kernel), we must recalculate the locations. So I think
dwarf location descriptor is the most accurate one.

Patch
diff mbox series

diff --git a/include/asm-generic/dwarf.h b/include/asm-generic/dwarf.h
new file mode 100644
index 000000000000..c705633c2a8f
--- /dev/null
+++ b/include/asm-generic/dwarf.h
@@ -0,0 +1,199 @@ 
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Architecture independent definitions of DWARF.
+ *
+ * Copyright (C) 2019 Changbin Du <changbin.du@gmail.com>
+ */
+#ifndef __ASM_GENERIC_DWARF_H
+#define __ASM_GENERIC_DWARF_H
+
+/*
+ * DWARF expression operations
+ */
+#define DW_OP_addr		0x03
+#define DW_OP_deref		0x06
+#define DW_OP_const1u		0x08
+#define DW_OP_const1s		0x09
+#define DW_OP_const2u		0x0a
+#define DW_OP_const2s		0x0b
+#define DW_OP_const4u		0x0c
+#define DW_OP_const4s		0x0d
+#define DW_OP_const8u		0x0e
+#define DW_OP_const8s		0x0f
+#define DW_OP_constu		0x10
+#define DW_OP_consts		0x11
+#define DW_OP_dup		0x12
+#define DW_OP_drop		0x13
+#define DW_OP_over		0x14
+#define DW_OP_pick		0x15
+#define DW_OP_swap		0x16
+#define DW_OP_rot		0x17
+#define DW_OP_xderef		0x18
+#define DW_OP_abs		0x19
+#define DW_OP_and		0x1a
+#define DW_OP_div		0x1b
+#define DW_OP_minus		0x1c
+#define DW_OP_mod		0x1d
+#define DW_OP_mul		0x1e
+#define DW_OP_neg		0x1f
+#define DW_OP_not		0x20
+#define DW_OP_or		0x21
+#define DW_OP_plus		0x22
+#define DW_OP_plus_uconst	0x23
+#define DW_OP_shl		0x24
+#define DW_OP_shr		0x25
+#define DW_OP_shra		0x26
+#define DW_OP_xor		0x27
+#define DW_OP_skip		0x2f
+#define DW_OP_bra		0x28
+#define DW_OP_eq		0x29
+#define DW_OP_ge		0x2a
+#define DW_OP_gt		0x2b
+#define DW_OP_le		0x2c
+#define DW_OP_lt		0x2d
+#define DW_OP_ne		0x2e
+#define DW_OP_lit0		0x30
+#define DW_OP_lit1		0x31
+#define DW_OP_lit2		0x32
+#define DW_OP_lit3		0x33
+#define DW_OP_lit4		0x34
+#define DW_OP_lit5		0x35
+#define DW_OP_lit6		0x36
+#define DW_OP_lit7		0x37
+#define DW_OP_lit8		0x38
+#define DW_OP_lit9		0x39
+#define DW_OP_lit10		0x3a
+#define DW_OP_lit11		0x3b
+#define DW_OP_lit12		0x3c
+#define DW_OP_lit13		0x3d
+#define DW_OP_lit14		0x3e
+#define DW_OP_lit15		0x3f
+#define DW_OP_lit16		0x40
+#define DW_OP_lit17		0x41
+#define DW_OP_lit18		0x42
+#define DW_OP_lit19		0x43
+#define DW_OP_lit20		0x44
+#define DW_OP_lit21		0x45
+#define DW_OP_lit22		0x46
+#define DW_OP_lit23		0x47
+#define DW_OP_lit24		0x48
+#define DW_OP_lit25		0x49
+#define DW_OP_lit26		0x4a
+#define DW_OP_lit27		0x4b
+#define DW_OP_lit28		0x4c
+#define DW_OP_lit29		0x4d
+#define DW_OP_lit30		0x4e
+#define DW_OP_lit31		0x4f
+#define DW_OP_reg0		0x50
+#define DW_OP_reg1		0x51
+#define DW_OP_reg2		0x52
+#define DW_OP_reg3		0x53
+#define DW_OP_reg4		0x54
+#define DW_OP_reg5		0x55
+#define DW_OP_reg6		0x56
+#define DW_OP_reg7		0x57
+#define DW_OP_reg8		0x58
+#define DW_OP_reg9		0x59
+#define DW_OP_reg10		0x5a
+#define DW_OP_reg11		0x5b
+#define DW_OP_reg12		0x5c
+#define DW_OP_reg13		0x5d
+#define DW_OP_reg14		0x5e
+#define DW_OP_reg15		0x5f
+#define DW_OP_reg16		0x60
+#define DW_OP_reg17		0x61
+#define DW_OP_reg18		0x62
+#define DW_OP_reg19		0x63
+#define DW_OP_reg20		0x64
+#define DW_OP_reg21		0x65
+#define DW_OP_reg22		0x66
+#define DW_OP_reg23		0x67
+#define DW_OP_reg24		0x68
+#define DW_OP_reg25		0x69
+#define DW_OP_reg26		0x6a
+#define DW_OP_reg27		0x6b
+#define DW_OP_reg28		0x6c
+#define DW_OP_reg29		0x6d
+#define DW_OP_reg30		0x6e
+#define DW_OP_reg31		0x6f
+#define DW_OP_breg0		0x70
+#define DW_OP_breg1		0x71
+#define DW_OP_breg2		0x72
+#define DW_OP_breg3		0x73
+#define DW_OP_breg4		0x74
+#define DW_OP_breg5		0x75
+#define DW_OP_breg6		0x76
+#define DW_OP_breg7		0x77
+#define DW_OP_breg8		0x78
+#define DW_OP_breg9		0x79
+#define DW_OP_breg10		0x7a
+#define DW_OP_breg11		0x7b
+#define DW_OP_breg12		0x7c
+#define DW_OP_breg13		0x7d
+#define DW_OP_breg14		0x7e
+#define DW_OP_breg15		0x7f
+#define DW_OP_breg16		0x80
+#define DW_OP_breg17		0x81
+#define DW_OP_breg18		0x82
+#define DW_OP_breg19		0x83
+#define DW_OP_breg20		0x84
+#define DW_OP_breg21		0x85
+#define DW_OP_breg22		0x86
+#define DW_OP_breg23		0x87
+#define DW_OP_breg24		0x88
+#define DW_OP_breg25		0x89
+#define DW_OP_breg26		0x8a
+#define DW_OP_breg27		0x8b
+#define DW_OP_breg28		0x8c
+#define DW_OP_breg29		0x8d
+#define DW_OP_breg30		0x8e
+#define DW_OP_breg31		0x8f
+#define DW_OP_regx		0x90
+#define DW_OP_fbreg		0x91
+#define DW_OP_bregx		0x92
+#define DW_OP_piece		0x93
+#define DW_OP_deref_size	0x94
+#define DW_OP_xderef_size	0x95
+#define DW_OP_nop		0x96
+#define DW_OP_push_object_address	0x97
+#define DW_OP_call2		0x98
+#define DW_OP_call4		0x99
+#define DW_OP_call_ref		0x9a
+#define DW_OP_form_tls_address	0x9b
+#define DW_OP_call_frame_cfa	0x9c
+#define DW_OP_bit_piece		0x9d
+#define DW_OP_implicit_value	0x9e
+#define DW_OP_stack_value	0x9f
+#define DW_OP_implicit_pointer	0xa0
+#define DW_OP_addrx		0xa1
+#define DW_OP_constx		0xa2
+#define DW_OP_entry_value	0xa3
+#define DW_OP_const_type	0xa4
+#define DW_OP_regval_type	0xa5
+#define DW_OP_deref_type	0xa6
+#define DW_OP_xderef_type	0xa7
+#define DW_OP_convert		0xa8
+#define DW_OP_reinterpret	0xa9
+
+/* GNU extensions.  */
+#define DW_OP_GNU_push_tls_address	0xe0
+#define DW_OP_GNU_uninit	0xf0
+#define DW_OP_GNU_encoded_addr	0xf1
+#define DW_OP_GNU_implicit_pointer	0xf2
+#define DW_OP_GNU_entry_value	0xf3
+#define DW_OP_GNU_const_type	0xf4
+#define DW_OP_GNU_regval_type	0xf5
+#define DW_OP_GNU_deref_type	0xf6
+#define DW_OP_GNU_convert	0xf7
+#define DW_OP_GNU_reinterpret	0xf9
+#define DW_OP_GNU_parameter_ref	0xfa
+
+/* GNU Debug Fission extensions.  */
+#define DW_OP_GNU_addr_index	0xfb,
+#define DW_OP_GNU_const_index	0xfc
+#define DW_OP_GNU_variable_value	0xfd
+
+#define DW_OP_lo_user		0xe0
+#define DW_OP_hi_user		0xff
+
+#endif /* __ASM_GENERIC_DWARF_H */