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https://github.com/genodelabs/genode.git
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base-linux: add ARM support
This patch introduces a new platform 'linux_arm' for building and running Genode/Linux on an ARM device. Known limitations: - libc 'setjmp()'/'longjmp()' doesn't currently save/restore floating point registers Fixes #746.
This commit is contained in:
Christian Prochaska
committed by
Norman Feske
Norman Feske
parent
314d5c0975
commit
4a9b1c6aab
@ -70,7 +70,13 @@ Process::Process(Dataspace_capability elf_data_ds_cap,
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PERR("Dynamically linked file found, but no dynamic linker binary present");
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return;
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}
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elf_data_ds_cap = _dynamic_linker_cap;
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/*
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* Starting the dynamic linker directly may cause it to be loaded at the
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* wrong address on ARM-Linux. But since the dynamically linked
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* application has a dynamic linker (by default ld.lib.so) defined as its
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* interpreter in the ELF image, it's okay to just start the application
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* directly on Linux.
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*/
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}
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/*
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66
base-linux/src/platform/arm/crt0.s
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66
base-linux/src/platform/arm/crt0.s
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@ -0,0 +1,66 @@
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/*
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* \brief Startup code for Genode applications
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* \author Christian Helmuth
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* \author Christian Prochaska
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* \date 2006-07-06
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*/
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/*
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* Copyright (C) 2006-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/*--- .text (program code) -------------------------*/
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.text
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.globl _start
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_start:
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ldr r1,=__initial_sp
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str sp,[r1]
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/*
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* environ = &argv[argc + 1]
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* in Genode argc is always 1
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*/
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add sp,sp,#12
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ldr r1,=lx_environ
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str sp,[r1]
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/* XXX Switch to our own stack. */
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ldr sp,=_stack_high
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/* Clear the frame pointer and the link register so that stack backtraces will work. */
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mov fp,#0
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mov lr,#0
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/* Jump into init C code */
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b _main
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/*--------------------------------------------------*/
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.data
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.globl __dso_handle
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__dso_handle:
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.long 0
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.globl __initial_sp
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__initial_sp:
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.long 0
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/*--- .eh_frame (exception frames) -----------------*/
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/*
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.section .eh_frame,"aw"
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.globl __EH_FRAME_BEGIN__
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__EH_FRAME_BEGIN__:
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*/
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/*--- .bss (non-initialized data) ------------------*/
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.bss
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.p2align 4
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.globl _stack_low
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_stack_low:
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.space 64*1024
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.globl _stack_high
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_stack_high:
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94
base-linux/src/platform/arm/lx_clone.S
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94
base-linux/src/platform/arm/lx_clone.S
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@ -0,0 +1,94 @@
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/*
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* \brief Linux clone() binding
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* \author Christian Prochaska
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* \date 2012-05-05
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*
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* based on eglibc-2.11.3/ports/sysdeps/unix/sysv/linux/arm/clone.S
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*/
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#define SYS_clone 120
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#define SYS_exit 1
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#define SYS_getpid 20
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#define __ARM_EABI__ 1
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#define CLONE_VM 0x00000100
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#define CLONE_THREAD 0x00010000
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.text
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.globl lx_clone
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.type lx_clone, #function
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lx_clone:
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@ insert the args onto the new stack
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str r3, [r1, #-4]!
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str r0, [r1, #-4]!
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@ do the system call
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@ get flags
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mov r0, r2
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#ifdef RESET_PID
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mov ip, r2
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#endif
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@ new sp is already in r1
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#ifdef __ARM_EABI__
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stmfd sp!, {r4, r7}
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#else
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str r4, [sp, #-8]!
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#endif
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ldr r2, [sp, #8]
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ldr r3, [sp, #12]
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ldr r4, [sp, #16]
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#ifdef __ARM_EABI__
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ldr r7, =SYS_clone
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swi 0x0
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#else
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swi SYS_clone
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#endif
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cmp r0, #0
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beq 1f
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#ifdef __ARM_EABI__
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ldmfd sp!, {r4, r7}
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#else
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ldr r4, [sp], #8
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#endif
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#blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
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bx lr
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1:
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#ifdef RESET_PID
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tst ip, #CLONE_THREAD
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bne 3f
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mov r0, #0xffff0fff
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mov lr, pc
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sub pc, r0, #31
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mov r1, r0
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tst ip, #CLONE_VM
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movne r0, #-1
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#ifdef __ARM_EABI__
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ldr r7, =SYS_getpid
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swieq 0x0
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#else
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swieq SYS_getpid
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#endif
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str r0, [r1, #PID_OFFSET]
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str r0, [r1, #TID_OFFSET]
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3:
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#endif
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@ pick the function arg and call address off the stack and execute
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ldr r0, [sp, #4]
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#if defined(__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__)
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ldr ip, [sp], #8
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mov lr, pc
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bx ip
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#else
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mov lr, pc
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ldr pc, [sp], #8
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#endif
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@ and we are done, passing the return value through r0
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ldr r7, =SYS_exit
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swi 0x0
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/* tell the linker that this code does not need an executable stack */
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.section .note.GNU-stack, "", %progbits
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29
base-linux/src/platform/arm/lx_syscall.S
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29
base-linux/src/platform/arm/lx_syscall.S
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@ -0,0 +1,29 @@
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/*
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* \brief Linux syscall() binding
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* \author Christian Prochaska
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* \date 2012-05-05
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*
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* based on eglibc-2.11.3/ports/sysdeps/unix/sysv/linux/arm/syscall.S
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*
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* error case:
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* glibc's syscall() function returns -1 and sets errno
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* lx_syscall() returns -errno
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*/
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.text
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.globl lx_syscall
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.type lx_syscall, #function
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lx_syscall:
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mov ip, sp
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stmfd sp!, {r4, r5, r6, r7}
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mov r7, r0
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mov r0, r1
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mov r1, r2
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mov r2, r3
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ldmfd ip, {r3, r4, r5, r6}
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swi 0x0
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ldmfd sp!, {r4, r5, r6, r7}
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bx lr
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/* tell the linker that this code does not need an executable stack */
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.section .note.GNU-stack, "", %progbits
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