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The ELF loader is basically functional (needs more testing)

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5265 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-10-27 00:04:47 +00:00
parent 49ed90be32
commit 2fc26f191d
8 changed files with 44 additions and 29 deletions
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2
ChangeLog
View file

@ -3522,3 +3522,5 @@
* configs/stm32f4discovery/elf and configs/stm32f4discovery/scripts/gnu-elf.ld
Add a configuration for testing the ARM ELF loader.
* binfmt/libelf: Can't use fstat(). NuttX does not yet support it. Damn!
* binfmt/libelf: The basic ELF module execution appears fully functional.

47
arch/arm/src/armv7-m/up_elf.c
View file

@ -218,8 +218,8 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
* The branch target is encoded in these bits:
*
* S = upper_insn[10]
* imm10 = upper_insn[9:0]
* imm11 = lower_insn[10:0]
* imm10 = upper_insn[0:9]
* imm11 = lower_insn[0:10]
* J1 = lower_insn[13]
* J2 = lower_insn[11]
*/
@ -227,7 +227,7 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
upper_insn = (uint32_t)(*(uint16_t*)addr);
lower_insn = (uint32_t)(*(uint16_t*)(addr + 2));
bvdbg("Performing JUMP24 [%d] link at addr=%08lx [%04x %04x] to sym=%p st_value=%08lx\n",
bvdbg("Performing THM_JUMP24 [%d] link at addr=%08lx [%04x %04x] to sym=%p st_value=%08lx\n",
ELF32_R_TYPE(rel->r_info), (long)addr, (int)upper_insn, (int)lower_insn,
sym, (long)sym->st_value);
@ -235,9 +235,9 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
*
* offset[24] = S
* offset[23] = ~(J1 ^ S)
* offset[22 = ~(J2 ^ S)]
* offset[21:12] = imm10
* offset[11:1] = imm11
* offset[22] = ~(J2 ^ S)]
* offset[12:21] = imm10
* offset[1:11] = imm11
* offset[0] = 0
*/
@ -245,11 +245,12 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
J1 = (lower_insn >> 13) & 1;
J2 = (lower_insn >> 11) & 1;
offset = (S << 24) |
((~(J1 ^ S) & 1) << 23) |
((~(J2 ^ S) & 1) << 22) |
((upper_insn & 0x03ff) << 12) |
((lower_insn & 0x07ff) << 1);
offset = (S << 24) | /* S - > offset[24] */
((~(J1 ^ S) & 1) << 23) | /* J1 -> offset[23] */
((~(J2 ^ S) & 1) << 22) | /* J2 -> offset[22] */
((upper_insn & 0x03ff) << 12) | /* imm10 -> offset[12:21] */
((lower_insn & 0x07ff) << 1); /* imm11 -> offset[1:11] */
/* 0 -> offset[0] */
/* Sign extend */
@ -374,31 +375,31 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
* 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* +---+---------------------------------------------------------+
* |OP | | 32-Bit Instructions
* +---+--+-------+--------------+-------------------------------+
* |0 |1 | imm3 | Rd | imm8 | MOVT Instruction
* +---+--+-------+--------------+-------------------------------+
* +---+----------+--------------+-------------------------------+
* |0 | imm3 | Rd | imm8 | MOVT Instruction
* +---+----------+--------------+-------------------------------+
*
* The 16-bit immediate value is encoded in these bits:
*
* i = imm16[11] = upper_insn[10]
* imm4 = imm16[12:15] = upper_insn[3:0]
* imm3 = imm16[9:11] = lower_insn[14:12]
* imm8 = imm16[0:8] = lower_insn[7:0]
* imm3 = imm16[8:10] = lower_insn[14:12]
* imm8 = imm16[0:7] = lower_insn[7:0]
*/
upper_insn = (uint32_t)(*(uint16_t*)addr);
lower_insn = (uint32_t)(*(uint16_t*)(addr + 2));
bvdbg("Performing MOVx [%d] link at addr=%08lx [%04x %04x] to sym=%p st_value=%08lx\n",
bvdbg("Performing THM_MOVx [%d] link at addr=%08lx [%04x %04x] to sym=%p st_value=%08lx\n",
ELF32_R_TYPE(rel->r_info), (long)addr, (int)upper_insn, (int)lower_insn,
sym, (long)sym->st_value);
/* Extract the 16-bit offset from the 32-bit instruction */
offset = ((upper_insn & 0x000f) << 12) |
((upper_insn & 0x0400) << 1) |
((lower_insn & 0x7000) >> 4) |
(lower_insn & 0x00ff);
offset = ((upper_insn & 0x000f) << 12) | /* imm4 -> imm16[8:10] */
((upper_insn & 0x0400) << 1) | /* i -> imm16[11] */
((lower_insn & 0x7000) >> 4) | /* imm3 -> imm16[8:10] */
(lower_insn & 0x00ff); /* imm8 -> imm16[0:7] */
/* Sign extend */
@ -406,8 +407,8 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
/* And perform the relocation */
bvdbg(" S=%d J1=%d J2=%d offset=%08lx branch target=%08lx\n",
S, J1, J2, (long)offset, offset + sym->st_value);
bvdbg(" offset=%08lx branch target=%08lx\n",
(long)offset, offset + sym->st_value);
offset += sym->st_value;

6
arch/arm/src/stm32/Kconfig
View file

@ -636,9 +636,11 @@ config ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG
config STM32_CCMEXCLUDE
bool "Exclude CCM SRAM from the heap"
depends on STM32_STM32F20XX || STM32_STM32F40XX
default y if ARCH_DMA
default y if ARCH_DMA || ELF
---help---
Exclude CCM SRAM from the HEAP because it cannot be used for DMA.
Exclude CCM SRAM from the HEAP because (1) it cannot be used for DMA
and (2) it appears to be impossible to execute ELF modules from CCM
RAM.
config STM32_FSMC_SRAM
bool "External SRAM on FSMC"

5
binfmt/libelf/libelf_bind.c
View file

@ -142,7 +142,10 @@ static int elf_relocate(FAR struct elf_loadinfo_s *loadinfo, int relidx,
int ret;
int i;
/* Examine each relocation in the section */
/* Examine each relocation in the section. 'relsec' is the section
* containing the relations. 'dstsec' is the section containing the data
* to be relocated.
*/
for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++)
{

1
binfmt/libelf/libelf_init.c
View file

@ -154,6 +154,7 @@ int elf_init(FAR const char *filename, FAR struct elf_loadinfo_s *loadinfo)
/* Get the length of the file. */
ret = elf_filelen(loadinfo, filename);
if (ret < 0)
{
bdbg("elf_filelen failed: %d\n", ret);
return ret;

4
configs/stm32f4discovery/README.txt
View file

@ -1007,6 +1007,10 @@ Where <subdir> is one of the following:
3. By default, this project assumes that you are *NOT* using the DFU
bootloader.
4. This configuration requires that you have the genromfs tool installed
on your system and that you have the full path to the installed genromfs
executable in PATH variable (see apps/examples/README.txt)
ostest:
------
This configuration directory, performs a simple OS test using

1
configs/stm32f4discovery/elf/Make.defs
View file

@ -160,6 +160,7 @@ LDNXFLATFLAGS = -e main -s 2048
# ELF module definitions
CELFFLAGS = $(CFLAGS) -mlong-calls
LDELFFLAGS = -r -e main
ifeq ($(WINTOOL),y)
LDELFFLAGS += -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld}"

7
configs/stm32f4discovery/elf/defconfig
View file

@ -179,7 +179,7 @@ CONFIG_STM32_USART2=y
CONFIG_STM32_JTAG_SW_ENABLE=y
# CONFIG_STM32_FORCEPOWER is not set
# CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG is not set
# CONFIG_STM32_CCMEXCLUDE is not set
CONFIG_STM32_CCMEXCLUDE=y
#
# USB Host Configuration
@ -251,7 +251,7 @@ CONFIG_SDCLONE_DISABLE=y
# CONFIG_SCHED_WAITPID is not set
# CONFIG_SCHED_ATEXIT is not set
# CONFIG_SCHED_ONEXIT is not set
CONFIG_USER_ENTRYPOINT="ostest_main"
CONFIG_USER_ENTRYPOINT="elf_main"
CONFIG_DISABLE_OS_API=y
# CONFIG_DISABLE_CLOCK is not set
# CONFIG_DISABLE_POSIX_TIMERS is not set
@ -387,6 +387,7 @@ CONFIG_ELF_ALIGN_LOG2=2
CONFIG_ELF_STACKSIZE=2048
CONFIG_ELF_BUFFERSIZE=128
CONFIG_ELF_BUFFERINCR=32
# CONFIG_ELF_CONSTRUCTORS is not set
CONFIG_SYMTAB_ORDEREDBYNAME=y
#
@ -409,7 +410,7 @@ CONFIG_ARCH_LOWPUTC=y
CONFIG_LIB_SENDFILE_BUFSIZE=512
# CONFIG_ARCH_ROMGETC is not set
# CONFIG_ARCH_OPTIMIZED_FUNCTIONS is not set
# CONFIG_HAVE_CXX is not set
CONFIG_HAVE_CXX=y
# CONFIG_HAVE_CXXINITIALIZE is not set
# CONFIG_CXX_NEWLONG is not set