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x86: Remove usage of %ebp as a return pointer

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Using %ebp as a return pointer prevents creating 'load anywhere' images
This commit is contained in:
Graeme Russ 2010-10-07 20:03:27 +11:00
parent 00940a229d
commit 88fa0a6eb9
5 changed files with 12 additions and 13 deletions
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6
arch/i386/cpu/sc520/sc520_asm.S
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@ -517,7 +517,7 @@ bad_ram:
jmp bad_reint jmp bad_reint
dram_done: dram_done:
jmp *%ebp jmp mem_init_ret
#if CONFIG_SYS_SDRAM_ECC_ENABLE #if CONFIG_SYS_SDRAM_ECC_ENABLE
.globl init_ecc .globl init_ecc
@ -562,7 +562,7 @@ set_ecc:
movb %al,(%edi) movb %al,(%edi)
out: out:
jmp *%ebp jmp init_ecc_ret
#endif #endif
/* /*
@ -607,4 +607,4 @@ bank3: movl (%edi), %eax
done: done:
movl %ebx, %eax movl %ebx, %eax
jmp *%ebp jmp get_mem_size_ret

12
arch/i386/cpu/start.S
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@ -1,7 +1,7 @@
/* /*
* U-boot - i386 Startup Code * U-boot - i386 Startup Code
* *
* Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se> * Copyright (c) 2002 Omicron Ceti AB, Daniel Engstr<EFBFBD>m <denaiel@omicron.se>
* *
* See file CREDITS for list of people who contributed to this * See file CREDITS for list of people who contributed to this
* project. * project.
@ -79,18 +79,18 @@ _start:
* to store the return address */ * to store the return address */
/* Early platform init (setup gpio, etc ) */ /* Early platform init (setup gpio, etc ) */
mov $early_board_init_ret, %ebp
jmp early_board_init jmp early_board_init
.globl early_board_init_ret
early_board_init_ret: early_board_init_ret:
/* size memory */ /* size memory */
mov $mem_init_ret, %ebp
jmp mem_init jmp mem_init
.globl mem_init_ret
mem_init_ret: mem_init_ret:
/* fetch memory size (into %eax) */ /* fetch memory size (into %eax) */
mov $get_mem_size_ret, %ebp
jmp get_mem_size jmp get_mem_size
.globl get_mem_size_ret
get_mem_size_ret: get_mem_size_ret:
#if CONFIG_SYS_SDRAM_ECC_ENABLE #if CONFIG_SYS_SDRAM_ECC_ENABLE
@ -98,9 +98,9 @@ get_mem_size_ret:
movl %ebx, %ecx movl %ebx, %ecx
andl $GD_FLG_COLD_BOOT, %ecx andl $GD_FLG_COLD_BOOT, %ecx
jz init_ecc_ret jz init_ecc_ret
mov $init_ecc_ret, %ebp
jmp init_ecc jmp init_ecc
.globl init_ecc_ret
init_ecc_ret: init_ecc_ret:
#endif #endif
@ -116,7 +116,7 @@ mem_ok:
pushl $0 pushl $0
popl %eax popl %eax
cmpl $0, %eax cmpl $0, %eax
jne no_stack jne die
push $0x55aa55aa push $0x55aa55aa
popl %ebx popl %ebx
cmpl $0x55aa55aa, %ebx cmpl $0x55aa55aa, %ebx

2
arch/i386/cpu/start16.S
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@ -35,8 +35,8 @@ start16:
* First we let the BSP do some early initialization * First we let the BSP do some early initialization
* this code have to map the flash to its final position * this code have to map the flash to its final position
*/ */
mov $board_init16_ret, %bp
jmp board_init16 jmp board_init16
.globl board_init16_ret
board_init16_ret: board_init16_ret:
/* Turn of cache (this might require a 486-class CPU) */ /* Turn of cache (this might require a 486-class CPU) */

2
board/eNET/eNET_start.S
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@ -27,7 +27,7 @@
.globl early_board_init .globl early_board_init
early_board_init: early_board_init:
/* No 32-bit board specific initialisation */ /* No 32-bit board specific initialisation */
jmp *%ebp /* return to caller */ jmp early_board_init_ret
.globl cpu_halt_asm .globl cpu_halt_asm
cpu_halt_asm: cpu_halt_asm:

3
board/eNET/eNET_start16.S
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@ -65,8 +65,7 @@ board_init16:
movl $0x000000cb, %eax movl $0x000000cb, %eax
outl %eax, %dx outl %eax, %dx
/* the return address is stored in bp */ jmp board_init16_ret
jmp *%bp
.section .bios, "ax" .section .bios, "ax"
.code16 .code16