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esp_rom: splict libgcc and libc outof rom.ld bundle file

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This commit is contained in:
morris
2020-01-20 13:31:28 +08:00
committed by suda-morris
parent e30cd361a8
commit 405b0e7f06
10 changed files with 107 additions and 275 deletions
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13
components/esp_rom/include/esp32s2/rom/libc_stubs.h
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@@ -1,9 +1,9 @@
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// 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
@@ -26,13 +26,13 @@ extern "C" {
#endif
/*
ESP32 ROM code contains implementations of some of C library functions.
ESP32-S2 ROM code contains implementations of some of C library functions.
Whenever a function in ROM needs to use a syscall, it calls a pointer to the corresponding syscall
implementation defined in the following struct.
The table itself, by default, is not allocated in RAM. There are two pointers, `syscall_table_ptr_pro` and
`syscall_table_ptr_app`, which can be set to point to the locations of syscall tables of CPU 0 (aka PRO CPU)
and CPU 1 (aka APP CPU). Location of these pointers in .bss segment of ROM code is defined in linker script.
The table itself, by default, is not allocated in RAM. There is a pointer, `syscall_table_ptr_pro`,
which can be set to point to the locations of syscall tables of CPU 0 (aka PRO CPU).
Location of this pointer in .bss segment of ROM code is defined in linker script.
So, before using any of the C library functions (except for pure functions and memcpy/memset functions),
application must allocate syscall table structure for each CPU being used, and populate it with pointers
@@ -80,7 +80,6 @@ struct syscall_stub_table
};
extern struct syscall_stub_table* syscall_table_ptr_pro;
extern struct syscall_stub_table* syscall_table_ptr_app;
#ifdef __cplusplus
} // extern "C"