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esp32: Add .noinit and .rtc_noinit sections to the linker script

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Added .rtc_noinit and .noinit section definitions into linker file /esp32/ld/esp32.common.ld.
The macro __NOINIT_ATTR, RTC_NOINIT_ATTR declared in esp32/esp_attr.h file.
Added unit test file to test added behavior for noinit variables and its attributes.
Added documentation changes for new added attributes.
Make some corrections after code review:
The linker file has been corrected to place noinit section before bss_start to make it safer.
Documentation file has been modified to clarify reset behavior of allocated data .
Corrected typos in test_noinit.c and removed assertion of noinit variable to avoid possible issues with ROM boot loader memory allocation.
The linker file has been corrected to place noinit section before bss_start to make it safer.
Documentation file has been modified to clarify reset behavior of allocated data .
Corrected typos in test_noinit.c and removed assertion of noinit variable to avoid possible issues with ROM boot loader memory allocation.
Update test_noinit.c file to address RTCWDT_RTC_RESET reset reason instead of POWERON_RESET.
Test optimized to pass automated unit testing.
esp32: Add .noinit and .rtc_noinit sections to the linker script
Update of general-notes.rst documentation to fomat examples as code and attributes as identifiers.
Test test_noinit.c corrected to pass automated testing (support ofTEST_CASE_MULTIPLE_STAGES())

https://ezredmine.espressif.cn:8765/issues/15878
This commit is contained in:
Alex Lisitsyn
2018-02-26 22:32:58 +05:00
parent f147a8d73d
commit 44b1bc0ab9
4 changed files with 176 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
components/esp32/ld/esp32.common.ld
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@@ -11,7 +11,7 @@ SECTIONS
. = ALIGN(4);
*(.rtc.literal .rtc.text)
*rtc_wake_stub*.o(.literal .text .literal.* .text.*)
} >rtc_iram_seg
} > rtc_iram_seg
/* RTC slow memory holds RTC wake stub
data/rodata, including from any source file
@@ -35,6 +35,20 @@ SECTIONS
_rtc_bss_end = ABSOLUTE(.);
} > rtc_slow_seg
/* This section holds data that should not be initialized at power up
and will be retained during deep sleep. The section located in
RTC SLOW Memory area. User data marked with RTC_NOINIT_ATTR will be placed
into this section. See the file "esp_attr.h" for more information.
*/
.rtc_noinit (NOLOAD):
{
. = ALIGN(4);
_rtc_noinit_start = ABSOLUTE(.);
*(.rtc_noinit .rtc_noinit.*)
. = ALIGN(4) ;
_rtc_noinit_end = ABSOLUTE(.);
} > rtc_slow_seg
/* Send .iram0 code to iram */
.iram0.vectors :
{
@@ -98,7 +112,7 @@ SECTIONS
INCLUDE esp32.spiram.rom-functions-iram.ld
_iram_text_end = ABSOLUTE(.);
} > iram0_0_seg
.dram0.data :
{
_data_start = ABSOLUTE(.);
@@ -124,7 +138,21 @@ SECTIONS
INCLUDE esp32.spiram.rom-functions-dram.ld
_data_end = ABSOLUTE(.);
. = ALIGN(4);
} >dram0_0_seg
} > dram0_0_seg
/*This section holds data that should not be initialized at power up.
The section located in Internal SRAM memory region. The macro _NOINIT
can be used as attribute to place data into this section.
See the esp_attr.h file for more information.
*/
.noinit (NOLOAD):
{
. = ALIGN(4);
_noinit_start = ABSOLUTE(.);
*(.noinit .noinit.*)
. = ALIGN(4) ;
_noinit_end = ABSOLUTE(.);
} > dram0_0_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
@@ -147,8 +175,9 @@ SECTIONS
*(COMMON)
. = ALIGN (8);
_bss_end = ABSOLUTE(.);
/* The heap starts right after end of this section */
_heap_start = ABSOLUTE(.);
} >dram0_0_seg
} > dram0_0_seg
.flash.rodata :
{