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- Fix / enhence AVR specific part of the ELF relocator. Some relocation types

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are still unsupported and will write warings on the second serial port.

- Fix elfloader_arch_write_rom (), which has to reside in a special bootloader
  section of flash rom. The code is heavly inspired from avr-libc's documentation.

- Prelimiary implementation of elfloader_arch_allocate_rom: Code is
  flashed to fixed address 0x8000. Note that on the AVR, flash rom is adressed
  word (16bit)-wise, not byte wise!

- Preliminary implementation of elfloader_arch_allocate_ram using the mmem
  module. Current code does not free the memory.
This commit is contained in:
barner 2006-12-22 17:10:54 +00:00
parent 5d6abc4cfe
commit 54ac97990d
1 changed files with 156 additions and 98 deletions
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234
core/loader/elfloader-avr.c
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@ -28,11 +28,16 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: elfloader-avr.c,v 1.3 2006/12/18 14:54:04 fros4943 Exp $ * @(#)$Id: elfloader-avr.c,v 1.4 2006/12/22 17:10:54 barner Exp $
*/ */
#include "elfloader-arch.h"
/*#include "dev/flash.h"*/ #include <stdio.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include "dev/rs232.h"
#include "elfloader-arch.h"
#include "lib/mmem.h"
#define R_AVR_NONE 0 #define R_AVR_NONE 0
#define R_AVR_32 1 #define R_AVR_32 1
@ -56,73 +61,94 @@
#define ELF32_R_TYPE(info) ((unsigned char)(info)) #define ELF32_R_TYPE(info) ((unsigned char)(info))
static char datamemory[ELFLOADER_DATAMEMORY_SIZE]; static struct mmem module_heap;
static const char textmemory[ELFLOADER_TEXTMEMORY_SIZE];
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
void * void*
elfloader_arch_allocate_ram(int size) elfloader_arch_allocate_ram(int size)
{ {
return datamemory; /* Allocate RAM for module (TODO: we leak the memory) */
if (mmem_alloc (&module_heap, size) == 0) {
return NULL;
}
return (char*)MMEM_PTR(&module_heap);
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
void * /* TODO: Currently, modules are written to the fixed address 0x10000. Since
* flash rom uses word addresses on the AVR, we return 0x8000 here
*/
void*
elfloader_arch_allocate_rom(int size) elfloader_arch_allocate_rom(int size)
{ {
/* Return an 512-byte aligned pointer. */ return 0x8000;
return (char *)
((unsigned long)&textmemory[0] & 0xfffffe00) +
(((unsigned long)&textmemory[0] & 0x1ff) == 0? 0: 0x200);
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
#define READSIZE 32
void BOOTLOADER_SECTION void
elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem) elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem)
{ {
#if 0 unsigned char buf[SPM_PAGESIZE];
int i; unsigned short* flashptr = mem;
unsigned int ptr;
unsigned short *flashptr;
flash_setup();
flashptr = (unsigned short *)elfloader_arch_textmemory; // Sanity-check size of loadable module
if (size <= 0)
return;
// Seek to patched module and burn it to flash (in chunks of
// size SPM_PAGESIZE, i.e. 256 bytes on the ATmega128)
cfs_seek(fd, textoff); cfs_seek(fd, textoff);
for(ptr = 0; ptr < size; ptr += READSIZE) { for (flashptr=mem; flashptr < mem + size; flashptr += SPM_PAGESIZE) {
memset (buf, 0, SPM_PAGESIZE);
cfs_read(fd, buf, SPM_PAGESIZE);
/* Read data from file into RAM. */ // Disable interrupts
cfs_read(fd, (unsigned char *)elfloader_arch_datamemory, READSIZE); uint8_t sreg;
sreg = SREG;
cli ();
/* Clear flash page on 512 byte boundary. */ // Erase flash page
if((((unsigned short)flashptr) & 0x01ff) == 0) { boot_page_erase (flashptr);
flash_clear(flashptr); boot_spm_busy_wait ();
}
/* Burn data from RAM into flash ROM. Flash is burned one 16-bit unsigned short *origptr = flashptr;
word at a time, so we need to be careful when incrementing
pointers. The flashptr is already a short pointer, so int i;
incrementing it by one will actually increment the address by // Store data into page buffer
two. */ for(i = 0; i < SPM_PAGESIZE; i+=2) {
for(i = 0; i < READSIZE / 2; ++i) { boot_page_fill (flashptr, (uint16_t)((buf[i+1] << 8) | buf[i]));
flash_write(flashptr, ((unsigned short *)elfloader_arch_datamemory)[i]); PORTB = 0xff - 7;
++flashptr; ++flashptr;
} }
}
flash_done(); // Burn page
#endif boot_page_write (origptr);
boot_spm_busy_wait();
// Reenable RWW sectin
boot_rww_enable ();
boot_spm_busy_wait ();
// Restore original interrupt settings
SREG = sreg;
}
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
static void static void
write_ldi(int fd, unsigned char *instr, unsigned char byte) write_ldi(int fd, unsigned char *instr, unsigned char byte)
{ {
instr[0] = (instr[0] & 0xf0) | (byte & 0x0f); instr[0] = (instr[0] & 0xf0) | (byte & 0x0f);
instr[1] = (instr[0] & 0xf0) | (byte >> 4); instr[1] = (instr[1] & 0xf0) | (byte >> 4);
cfs_write(fd, instr, 2); cfs_write (fd, instr, 2);
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
void void
elfloader_arch_relocate(int fd, unsigned int sectionoffset, elfloader_arch_relocate(int fd, unsigned int sectionoffset,
// struct elf32_rela *rela, elf32_addr addr)
char *sectionaddr, char *sectionaddr,
struct elf32_rela *rela, char *addr) struct elf32_rela *rela, char *addr)
{ {
@ -133,84 +159,116 @@ elfloader_arch_relocate(int fd, unsigned int sectionoffset,
cfs_read(fd, instr, 4); cfs_read(fd, instr, 4);
cfs_seek(fd, sectionoffset + rela->r_offset); cfs_seek(fd, sectionoffset + rela->r_offset);
addr += rela->r_addend;
type = ELF32_R_TYPE(rela->r_info); type = ELF32_R_TYPE(rela->r_info);
printf("elfloader_arch_relocate: type %d\n", type); addr += rela->r_addend;
switch(type) { switch(type) {
case R_AVR_NONE: case R_AVR_NONE:
case R_AVR_32: case R_AVR_32:
case R_AVR_7_PCREL: /* >> 1 */ rs232_print_p (RS232_PORT_1, PSTR ("elfloader-avr.c: unsupported relocation type: "));
case R_AVR_13_PCREL: /* >> 1 */ rs232_printf (RS232_PORT_1, "%d\n", type);
printf("elfloader-avr.c: unsupported relocation type %d\n", type);
break; break;
case R_AVR_16: case R_AVR_7_PCREL: { /* 4 */
cfs_write(fd, (char *)addr, 2); /*
* Relocation is relative to PC. -2: branch instructions add 2 to PC.
* Do not use >> 1 for division because branch instructions use
* signed offsets.
*/
int16_t a = (((int16_t)addr - rela->r_offset -2) / 2);
instr[0] |= (a << 3) & 0xf8;
instr[1] |= (a >> 5) & 0x03;
cfs_write(fd, instr, 2);
}
break; break;
case R_AVR_16_PM: case R_AVR_13_PCREL: { /* 3 */
addr = (char *)((unsigned long)addr >> 1); /*
cfs_write(fd, (char *)addr, 2); * Relocation is relative to PC. -2: RJMP adds 2 to PC.
* Do not use >> 1 for division because RJMP uses signed offsets.
*/
int16_t a = (int16_t)addr / 2;
a -= rela->r_offset / 2;
a--;
instr[0] |= a & 0xff;
instr[1] |= (a >> 8) & 0x0f;
cfs_write(fd, instr, 2);
}
break; break;
case R_AVR_LO8_LDI: case R_AVR_16: /* 4 */
write_ldi(fd, instr, (unsigned long)addr); instr[0] = (int16_t)addr & 0xff;
instr[1] = ((int16_t)addr >> 8) & 0xff;
cfs_write(fd, instr, 2);
break; break;
case R_AVR_HI8_LDI: case R_AVR_16_PM: /* 5 */
write_ldi(fd, instr, (unsigned long)addr >> 8); addr = ((int16_t)addr >> 1);
break; instr[0] = (int16_t)addr & 0xff;
case R_AVR_HH8_LDI: instr[1] = ((int16_t)addr >> 8) & 0xff;
write_ldi(fd, instr, (unsigned long)addr >> 16);
cfs_write(fd, instr, 2);
break; break;
case R_AVR_LO8_LDI_NEG: case R_AVR_LO8_LDI: /* 6 */
addr = (char *)(0 - (unsigned long)addr); write_ldi(fd, instr, (int16_t)addr);
write_ldi(fd, instr, (unsigned long)addr);
break; break;
case R_AVR_HI8_LDI_NEG: case R_AVR_HI8_LDI: /* 7 */
addr = (char *)(0 - (unsigned long)addr); write_ldi(fd, instr, (int16_t)addr >> 8);
write_ldi(fd, instr, (unsigned long)addr >> 8);
break; break;
case R_AVR_HH8_LDI_NEG: case R_AVR_HH8_LDI: /* 8 */
addr = (char *)(0 - (unsigned long)addr); write_ldi(fd, instr, (int16_t)addr >> 16);
write_ldi(fd, instr, (unsigned long)addr >> 16);
break; break;
case R_AVR_LO8_LDI_PM: case R_AVR_LO8_LDI_NEG: /* 9 */
write_ldi(fd, instr, (unsigned long)addr >> 1); addr = (0 - (int16_t)addr);
write_ldi(fd, instr, (int16_t)addr);
break; break;
case R_AVR_HI8_LDI_PM: case R_AVR_HI8_LDI_NEG: /* 10 */
write_ldi(fd, instr, (unsigned long)addr >> 9); addr = (0 - (int16_t)addr);
write_ldi(fd, instr, (int16_t)addr >> 8);
break; break;
case R_AVR_HH8_LDI_PM: case R_AVR_HH8_LDI_NEG: /* 11 */
write_ldi(fd, instr, (unsigned long)addr >> 17); addr = (0 - (int16_t)addr);
write_ldi(fd, instr, (int16_t)addr >> 16);
break; break;
case R_AVR_LO8_LDI_PM_NEG: case R_AVR_LO8_LDI_PM: /* 12 */
addr = (char *)(0 - (unsigned long)addr); write_ldi(fd, instr, (int16_t)addr >> 1);
write_ldi(fd, instr, (unsigned long)addr >> 1);
break; break;
case R_AVR_HI8_LDI_PM_NEG: case R_AVR_HI8_LDI_PM: /* 13 */
addr = (char *)(0 - (unsigned long)addr); write_ldi(fd, instr, (int16_t)addr >> 9);
write_ldi(fd, instr, (unsigned long)addr >> 9);
break; break;
addr = (char *)(0 - (unsigned long)addr); case R_AVR_HH8_LDI_PM: /* 14 */
case R_AVR_HH8_LDI_PM_NEG: write_ldi(fd, instr, (int16_t)addr >> 17);
write_ldi(fd, instr, (unsigned long)addr >> 17);
break; break;
case R_AVR_CALL: case R_AVR_LO8_LDI_PM_NEG: /* 15 */
addr = (char *)((unsigned long)addr >> 1); addr = (0 - (int16_t)addr);
instr[3] = (unsigned long)addr >> 8; write_ldi(fd, instr, (int16_t)addr >> 1);
instr[4] = (unsigned long)addr & 0xff; break;
printf("R_AVR_CALL:Writing 0x%02x 0x%02x 0x%02x 0x%02x\n", case R_AVR_HI8_LDI_PM_NEG: /* 16 */
instr[0], instr[1], instr[2], instr[3]); addr = (0 - (int16_t)addr);
write_ldi(fd, instr, (int16_t)addr >> 9);
break;
case R_AVR_HH8_LDI_PM_NEG: /* 17 */
addr = (0 - (int16_t)addr);
write_ldi(fd, instr, (int16_t)addr >> 17);
break;
case R_AVR_CALL: /* 18 */
addr = ((int16_t)addr >> 1);
instr[2] = (int16_t)addr & 0xff;
instr[3] = (int16_t)addr >> 8;
cfs_write(fd, instr, 4); cfs_write(fd, instr, 4);
break; break;
default:
rs232_print_p (RS232_PORT_1, PSTR ("Unknown reloation type!\n"));
break;
} }
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
void
elfloader_unload(void) {
}