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- Introduce kernel_kseg0_end variable that marks first address in KSEG0

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available for use. All data below this address considered to be used
    by kernel. Along with kernel own data it might be symbol tables
    prepeared by trampoline code, boot loader service data passed for
    further analysis by kernel, etc... By default kernel_kseg0_end points
    to the end of loaded kernel.

- Introduce mips_postboot_fixup function. It checks for symbol information
    copied by ELF trampoline and passes it to KDB
This commit is contained in:
Oleksandr Tymoshenko 2010-01-24 03:10:48 +00:00
parent 2a3e287f9f
commit 48fc5de116
2 changed files with 35 additions and 0 deletions
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2
sys/mips/include/md_var.h
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@ -44,6 +44,7 @@ extern char sigcode[];
extern int szsigcode, szosigcode;
extern vm_offset_t kstack0;
extern vm_offset_t kernel_kseg0_end;
void MipsSaveCurFPState(struct thread *);
void fork_trampoline(void);
@ -69,6 +70,7 @@ void cpu_identify(void);
void mips_cpu_init(void);
void mips_pcpu0_init(void);
void mips_proc0_init(void);
void mips_postboot_fixup(void);
/* Platform call-downs. */
void platform_identify(void);

33
sys/mips/mips/machdep.c
View File

@ -85,6 +85,7 @@ __FBSDID("$FreeBSD$");
#include <machine/clock.h>
#include <machine/cpu.h>
#include <machine/cpuregs.h>
#include <machine/elf.h>
#include <machine/hwfunc.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
@ -151,9 +152,18 @@ extern char MipsTLBMiss[], MipsTLBMissEnd[];
extern char MipsCache[], MipsCacheEnd[];
extern char edata[], end[];
#ifdef DDB
extern vm_offset_t ksym_start, ksym_end;
#endif
u_int32_t bootdev;
struct bootinfo bootinfo;
/*
* First kseg0 address available for use. By default it's equal to &end.
* But in some cases there might be additional data placed right after
* _end by loader or ELF trampoline.
*/
vm_offset_t kernel_kseg0_end = (vm_offset_t)&end;
static void
cpu_startup(void *dummy)
@ -359,6 +369,29 @@ mips_vector_init(void)
}
/*
* Fix kernel_kseg0_end address in case trampoline placed debug sympols
* data there
*/
void
mips_postboot_fixup(void)
{
#ifdef DDB
Elf_Size *trampoline_data = (Elf_Size*)kernel_kseg0_end;
Elf_Size symtabsize = 0;
if (trampoline_data[0] == SYMTAB_MAGIC) {
symtabsize = trampoline_data[1];
kernel_kseg0_end += 2 * sizeof(Elf_Size);
/* start of .symtab */
ksym_start = kernel_kseg0_end;
kernel_kseg0_end += symtabsize;
/* end of .strtab */
ksym_end = kernel_kseg0_end;
}
#endif
}
/*
* Many SoCs have a means to reset the core itself. Others do not, or
* the method is unknown to us. For those cases, we jump to the mips