Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-16 17:58:23 +00:00
Code Issues Projects Releases Packages Wiki Activity
u-boot/examples/api/crt0.S

55 lines
704 B
ArmAsm
Raw Normal View History

API for external applications. This is an API for external (standalone) applications running on top of U-Boot, and is meant to be more extensible and robust than the existing jumptable mechanism. It is similar to UNIX syscall approach. See api/README for more details. Included is the demo application using this new framework (api_examples). Please note this is still an experimental feature, and is turned off by default. Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2008-01-09 18:39:36 +00:00
/*
* (C) Copyright 2007 Semihalf
*
* Written by: Rafal Jaworowski <raj@semihalf.com>
*
Add GPL-2.0+ SPDX-License-Identifier to source files Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
2013-07-08 07:37:19 +00:00
* SPDX-License-Identifier: GPL-2.0+
API for external applications. This is an API for external (standalone) applications running on top of U-Boot, and is meant to be more extensible and robust than the existing jumptable mechanism. It is similar to UNIX syscall approach. See api/README for more details. Included is the demo application using this new framework (api_examples). Please note this is still an experimental feature, and is turned off by default. Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2008-01-09 18:39:36 +00:00
*/
#if defined(CONFIG_PPC)
.text
.globl _start
_start:
API: Use stack pointer as API signature search hint in the glue layer. De-hardcode range in RAM we search for the API signature. Instead use the stack pointer as a hint to narrow down the range in which the signature could reside (it is malloc'ed on the U-Boot heap, and is hoped to remain in some proximity from stack area). Adjust PowerPC code in API demo to the new scheme. Signed-off-by: Rafal Czubak <rcz@semihalf.com> Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2009-01-23 12:27:15 +00:00
lis %r11, search_hint@ha
addi %r11, %r11, search_hint@l
stw %r1, 0(%r11)
API for external applications. This is an API for external (standalone) applications running on top of U-Boot, and is meant to be more extensible and robust than the existing jumptable mechanism. It is similar to UNIX syscall approach. See api/README for more details. Included is the demo application using this new framework (api_examples). Please note this is still an experimental feature, and is turned off by default. Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2008-01-09 18:39:36 +00:00
b main
.globl syscall
syscall:
lis %r11, syscall_ptr@ha
addi %r11, %r11, syscall_ptr@l
lwz %r11, 0(%r11)
mtctr %r11
bctr
API: Provide syscall entry point for the ARM architecture. Signed-off-by: Rafal Czubak <rcz@semihalf.com> Acked-by: Rafal Jaworowski <raj@semihalf.com>
2009-01-23 12:27:16 +00:00
#elif defined(CONFIG_ARM)
.text
.globl _start
_start:
ldr ip, =search_hint
str sp, [ip]
b main
.globl syscall
syscall:
ldr ip, =syscall_ptr
ldr pc, [ip]
API: Use stack pointer as API signature search hint in the glue layer. De-hardcode range in RAM we search for the API signature. Instead use the stack pointer as a hint to narrow down the range in which the signature could reside (it is malloc'ed on the U-Boot heap, and is hoped to remain in some proximity from stack area). Adjust PowerPC code in API demo to the new scheme. Signed-off-by: Rafal Czubak <rcz@semihalf.com> Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2009-01-23 12:27:15 +00:00
#else
#error No support for this arch!
#endif
API for external applications. This is an API for external (standalone) applications running on top of U-Boot, and is meant to be more extensible and robust than the existing jumptable mechanism. It is similar to UNIX syscall approach. See api/README for more details. Included is the demo application using this new framework (api_examples). Please note this is still an experimental feature, and is turned off by default. Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2008-01-09 18:39:36 +00:00
.globl syscall_ptr
syscall_ptr:
.align 4
.long 0
API: Use stack pointer as API signature search hint in the glue layer. De-hardcode range in RAM we search for the API signature. Instead use the stack pointer as a hint to narrow down the range in which the signature could reside (it is malloc'ed on the U-Boot heap, and is hoped to remain in some proximity from stack area). Adjust PowerPC code in API demo to the new scheme. Signed-off-by: Rafal Czubak <rcz@semihalf.com> Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
2009-01-23 12:27:15 +00:00
.globl search_hint
search_hint:
.long 0
Reference in a new issue Copy permalink