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Diffstat (limited to 'os/common/startup/e200/compilers/GCC/crt0.S')
| -rw-r--r-- | os/common/startup/e200/compilers/GCC/crt0.S | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/os/common/startup/e200/compilers/GCC/crt0.S b/os/common/startup/e200/compilers/GCC/crt0.S new file mode 100644 index 000000000..007b55d3b --- /dev/null +++ b/os/common/startup/e200/compilers/GCC/crt0.S @@ -0,0 +1,242 @@ +/*
+ ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file GCC/crt0.s
+ * @brief Generic PowerPC startup file for GCC.
+ *
+ * @addtogroup PPC_GCC_CORE
+ * @{
+ */
+
+/*===========================================================================*/
+/* Module constants. */
+/*===========================================================================*/
+
+#if !defined(FALSE) || defined(__DOXYGEN__)
+#define FALSE 0
+#endif
+
+#if !defined(TRUE) || defined(__DOXYGEN__)
+#define TRUE 1
+#endif
+
+/*===========================================================================*/
+/* Module pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @brief Stack segments initialization switch.
+ */
+#if !defined(CRT0_STACKS_FILL_PATTERN) || defined(__DOXYGEN__)
+#define CRT0_STACKS_FILL_PATTERN 0x55555555
+#endif
+
+/**
+ * @brief Stack segments initialization switch.
+ */
+#if !defined(CRT0_INIT_STACKS) || defined(__DOXYGEN__)
+#define CRT0_INIT_STACKS TRUE
+#endif
+
+/**
+ * @brief DATA segment initialization switch.
+ */
+#if !defined(CRT0_INIT_DATA) || defined(__DOXYGEN__)
+#define CRT0_INIT_DATA TRUE
+#endif
+
+/**
+ * @brief BSS segment initialization switch.
+ */
+#if !defined(CRT0_INIT_BSS) || defined(__DOXYGEN__)
+#define CRT0_INIT_BSS TRUE
+#endif
+
+/**
+ * @brief Constructors invocation switch.
+ */
+#if !defined(CRT0_CALL_CONSTRUCTORS) || defined(__DOXYGEN__)
+#define CRT0_CALL_CONSTRUCTORS TRUE
+#endif
+
+/**
+ * @brief Destructors invocation switch.
+ */
+#if !defined(CRT0_CALL_DESTRUCTORS) || defined(__DOXYGEN__)
+#define CRT0_CALL_DESTRUCTORS TRUE
+#endif
+
+/*===========================================================================*/
+/* Code section. */
+/*===========================================================================*/
+
+#if !defined(__DOXYGEN__)
+
+ .section .crt0, "ax"
+ .align 2
+ .globl _boot_address
+ .type _boot_address, @function
+_boot_address:
+ /* Stack setup.*/
+ lis %r1, __process_stack_end__@h
+ ori %r1, %r1, __process_stack_end__@l
+ li %r0, 0
+ stwu %r0, -8(%r1)
+
+ /* Small sections registers initialization.*/
+ lis %r2, __sdata2_start__@h
+ ori %r2, %r2, __sdata2_start__@l
+ lis %r13, __sdata_start__@h
+ ori %r13, %r13, __sdata_start__@l
+
+ /* Early initialization.*/
+ bl __early_init
+
+#if CRT0_INIT_STACKS == TRUE
+ /* Stacks fill pattern.*/
+ lis %r7, CRT0_STACKS_FILL_PATTERN@h
+ ori %r7, %r7, CRT0_STACKS_FILL_PATTERN@l
+
+ /* IRQ Stack initialization. Note, the architecture does not use this
+ stack, the size is usually zero. An OS can have special SW handling
+ and require this. A 4 bytes alignment is assmend and required.*/
+ lis %r4, __irq_stack_base__@h
+ ori %r4, %r4, __irq_stack_base__@l
+ lis %r5, __irq_stack_end__@h
+ ori %r5, %r5, __irq_stack_end__@l
+.irqsloop:
+ cmpl cr0, %r4, %r5
+ bge cr0, .irqsend
+ stw %r7, 0(%r4)
+ addi %r4, %r4, 4
+ b .irqsloop
+.irqsend:
+
+ /* Process Stack initialization. Note, does not overwrite the already
+ written EABI frame. A 4 bytes alignment is assmend and required.*/
+ lis %r4, __process_stack_base__@h
+ ori %r4, %r4, __process_stack_base__@l
+ lis %r5, (__process_stack_end__ - 8)@h
+ ori %r5, %r5, (__process_stack_end__ - 8)@l
+.prcsloop:
+ cmpl cr0, %r4, %r5
+ bge cr0, .prcsend
+ stw %r7, 0(%r4)
+ addi %r4, %r4, 4
+ b .prcsloop
+.prcsend:
+#endif
+
+#if CRT0_INIT_BSS == TRUE
+ /* BSS clearing.*/
+ lis %r4, __bss_start__@h
+ ori %r4, %r4, __bss_start__@l
+ lis %r5, __bss_end__@h
+ ori %r5, %r5, __bss_end__@l
+ li %r7, 0
+.bssloop:
+ cmpl cr0, %r4, %r5
+ bge cr0, .bssend
+ stw %r7, 0(%r4)
+ addi %r4, %r4, 4
+ b .bssloop
+.bssend:
+#endif
+
+#if CRT0_INIT_DATA == TRUE
+ /* DATA initialization.*/
+ lis %r4, __romdata_start__@h
+ ori %r4, %r4, __romdata_start__@l
+ lis %r5, __data_start__@h
+ ori %r5, %r5, __data_start__@l
+ lis %r6, __data_end__@h
+ ori %r6, %r6, __data_end__@l
+.dataloop:
+ cmpl cr0, %r5, %r6
+ bge cr0, .dataend
+ lwz %r7, 0(%r4)
+ addi %r4, %r4, 4
+ stw %r7, 0(%r5)
+ addi %r5, %r5, 4
+ b .dataloop
+.dataend:
+#endif
+
+ /* Late initialization.*/
+ bl __late_init
+
+#if CRT0_CALL_CONSTRUCTORS == TRUE
+ /* Constructors invocation.*/
+ lis %r4, __init_array_start@h
+ ori %r4, %r4, __init_array_start@l
+ lis %r5, __init_array_end@h
+ ori %r5, %r5, __init_array_end@l
+.iniloop:
+ cmplw %cr0, %r4, %r5
+ bge %cr0, .iniend
+ lwz %r6, 0(%r4)
+ mtctr %r6
+ addi %r4, %r4, 4
+ bctrl
+ b .iniloop
+.iniend:
+#endif
+
+ /* Main program invocation.*/
+ bl main
+
+#if CRT0_CALL_DESTRUCTORS == TRUE
+ /* Destructors invocation.*/
+ lis %r4, __fini_array_start@h
+ ori %r4, %r4, __fini_array_start@l
+ lis %r5, __fini_array_end@h
+ ori %r5, %r5, __fini_array_end@l
+.finiloop:
+ cmplw %cr0, %r4, %r5
+ bge %cr0, .finiend
+ lwz %r6, 0(%r4)
+ mtctr %r6
+ addi %r4, %r4, 4
+ bctrl
+ b .finiloop
+.finiend:
+#endif
+
+ /* Branching to the defined exit handler.*/
+ b __default_exit
+
+ /* Default main exit code, infinite loop.*/
+ .weak __default_exit
+ .type __default_exit, @function
+__default_exit:
+ b __default_exit
+
+ /* Default early initialization code, none.*/
+ .weak __early_init
+ .type __early_init, @function
+__early_init:
+ blr
+
+ /* Default late initialization code, none.*/
+ .weak __late_init
+ .type __late_init, @function
+__late_init:
+ blr
+
+#endif /* !defined(__DOXYGEN__) */
+
+/** @} */
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