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Message
From: György 'nog' Jeney<nog@s...>
Date: Wed Mar 30 22:33:32 CEST 2005
Subject: [openrisc] or1ksim patches #34, #43, #53-2, #64, #68-#73
> This is not what i ment. The
>
> static void *pfoo_call __attribute__((section(".text")));
>
> only creates pointer in the .text section, which is pointing then to
> something in heap. i thought something like
>
> static char __attribute__((section(".text"))) page[PAGE_SIZE];
>
> and then copy some executable code to that page and execute the code
> from there...
Actually not ignoring the assembler warnings the variable doesn't even go into
the text section: "Warning: ignoring changed section attributes for .text".
Forcing a write to the text section also causes a segmentation fault, as
demonstrated with the modified execs.c program (attached). Also the immu has a
configurable page size. For now it is hardcoded to 8192 in the recompiler,
which will need to get fixed someday.
> > - The sim crashes when running `ls' in proc/net.
>
> this is interesting. where it crashes (ethernet ???, but why...)
I'm still investigateing.
> > - Running the `test' program (in the initrd) fails, same as vi, and some others.
>
> how it fails ?
Userspace sigsegv. It's the fault of the recompiler.
> > Before I go and commint > 40 patches to cvs in one go, is the cvs-checkins list
> > going to work anytime soon? It is much easier to do regression tests if the
> > commit logs are availible.
>
> agreed, but very unlikely that it will be fixed in forseeable time.
> what you could do, and it will actually help with regression tests is to
> do a cvs tag after each patch...
Ok, tomorrow afternoon the patches go in. Do we really want > 40 tags in the
repostry (that are usefull only for a limited time)?
nog.
PS: You neglected to comment on patch #51 and #52...
-------------- next part --------------
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/*
static void *pfoo_call __attribute__((section(".text"))) = NULL;
*/
extern void *pfoo_call;
asm(
".section .text\n"
"pfoo_call: movl $0xffffffff, %eax\n"
);
void foo(void)
{
printf("Hello World!\n");
}
void foo_call(void);
asm(
".section .text\n"
".globl foo_call\n"
"\t.type foo_call,@function\n"
"foo_call:\n"
"\tmov $foo, %eax\n"
"\tjmp *%eax\n"
);
int main()
{
/* foo_call is 8 bytes long */
pfoo_call = malloc(8);
memcpy(pfoo_call, foo_call, 8);
asm volatile ("movl %0, %%eax\n"
"call *%%eax\n" : : "m" (pfoo_call) : "eax");
return 0;
}
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