* Re: getting text strings into __initdata for char *foo = "data"
2002-11-20 22:43 getting text strings into __initdata for char *foo = "data" Patrick Mansfield
@ 2002-11-20 23:43 ` Richard B. Johnson
2002-11-21 5:48 ` Keith Owens
1 sibling, 0 replies; 3+ messages in thread
From: Richard B. Johnson @ 2002-11-20 23:43 UTC (permalink / raw)
To: Patrick Mansfield; +Cc: linux-kernel
On Wed, 20 Nov 2002, Patrick Mansfield wrote:
> Hi -
>
> Is there a way to get char * initialized data to go into the init
> data section?
>
> For example, in the following I want init_foobar and its associated
> text strings to go into the init data section, not just the pointers
> in init_foobar:
>
[SNIPPED...]
I use assembler when I need to do things 'C' doesn't want
to do.. like:
.section .init.data
.global foo
.type foo,@object
.size foo,11
foo: .string "1234567890"
This will work for ".sections" like .data, etc,. but the
object file in empty when I use .init.data. This is probably
because gas treats .string specially. I know you can do this
with ".byte". You don't have to make the assembly by hand.
I do something like:
#ifdef THIS_WILL_NEVER_BE_DEFINED
char foo[]="This is the string..."
#else
extern char foo[];
#endif
I write a 'C' program that looks for "THIS_WILL_NEVER_BE_DEFINED"
and writes gas assembly for the strings up to the "#else".
I do this in an embedded system to put many/most/all strings
in NVRAM PROM.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Bush : The Fourth Reich of America
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: getting text strings into __initdata for char *foo = "data"
2002-11-20 22:43 getting text strings into __initdata for char *foo = "data" Patrick Mansfield
2002-11-20 23:43 ` Richard B. Johnson
@ 2002-11-21 5:48 ` Keith Owens
1 sibling, 0 replies; 3+ messages in thread
From: Keith Owens @ 2002-11-21 5:48 UTC (permalink / raw)
To: Patrick Mansfield; +Cc: linux-kernel
On Wed, 20 Nov 2002 14:43:43 -0800,
Patrick Mansfield <patmans@us.ibm.com> wrote:
>Is there a way to get char * initialized data to go into the init
>data section?
>
>For example, in the following I want init_foobar and its associated
>text strings to go into the init data section, not just the pointers
>in init_foobar:
>From the kdb common patch, kdb/Makefile.
gen-kdb_cmds.c: kdb_cmds Makefile
$(AWK) 'BEGIN {print "#include <linux/init.h>"} \
/^ *#/{next} \
/^[ \t]*$$/{next} \
{gsub(/"/, "\\\"", $$0); \
print "static __initdata char kdb_cmd" cmds++ "[] = \"" $$0 "\\n\";"} \
END {print "char __initdata *kdb_cmds[] = {"; for (i = 0; i < cmds; ++i) {print " kdb_cmd" i ","}; print(" 0\n};");}' \
kdb_cmds > gen-kdb_cmds.c
Converts kdb_cmds
set LINES 2000
set BTSP 1
bp sys_open
into gen-kdb_cmds.c
#include <linux/init.h>
static __initdata char kdb_cmd0[] = "set LINES 2000\n";
static __initdata char kdb_cmd1[] = "set BTSP 1\n";
static __initdata char kdb_cmd2[] = "bp sys_open\n";
char __initdata *kdb_cmds[] = {
kdb_cmd0,
kdb_cmd1,
kdb_cmd2,
0
};
# objdump -h kdb/gen-kdb_cmds.o
kdb/gen-kdb_cmds.o: file format elf64-ia64-little
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000000 0000000000000000 0000000000000000 00000040 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 0000000000000000 0000000000000000 00000040 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 0000000000000000 0000000000000000 00000040 2**0
ALLOC
3 .debug_abbrev 000000a8 0000000000000000 0000000000000000 00000040 2**0
CONTENTS, READONLY, DEBUGGING
4 .debug_info 000001c7 0000000000000000 0000000000000000 000000e8 2**0
CONTENTS, RELOC, READONLY, DEBUGGING
5 .debug_line 00000000 0000000000000000 0000000000000000 000002af 2**0
CONTENTS, READONLY, DEBUGGING
6 .data.init 00000050 0000000000000000 0000000000000000 000002b0 2**3
CONTENTS, ALLOC, LOAD, RELOC, DATA
7 .debug_pubnames 0000001f 0000000000000000 0000000000000000 00000300 2**0
CONTENTS, RELOC, READONLY, DEBUGGING
8 .comment 00000029 0000000000000000 0000000000000000 0000031f 2**0
CONTENTS, READONLY
text, data and bss are all 0 size. Everything is in .data.init.
^ permalink raw reply [flat|nested] 3+ messages in thread