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esp32: Provision to redirect .bss to external ram through linker fragments

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Include external ram section in the linker template to process it
through linker script generation mechanism. This enables redirection of .bss section to external memory using linker fragments

libnet80211, libpp, libbt, liblwip: Redirect .bss through fragments
This commit is contained in:
Sachin Parekh
2020-07-31 12:26:29 +05:30
committed by bot
parent 9fd5138ce2
commit be5563207d
11 changed files with 61 additions and 46 deletions
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6
components/esp32/CMakeLists.txt
View File

@@ -42,12 +42,6 @@ else()
target_linker_script(${COMPONENT_LIB} INTERFACE "${CMAKE_CURRENT_BINARY_DIR}/esp32_out.ld")
if(CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY)
# This has to be linked before esp32.project.ld
target_linker_script(${COMPONENT_LIB} INTERFACE "ld/esp32.extram.bss.ld")
endif()
# Process the template file through the linker script generation mechanism, and use the output for linking the
# final binary
target_linker_script(${COMPONENT_LIB} INTERFACE "${CMAKE_CURRENT_LIST_DIR}/ld/esp32.project.ld.in"

5
components/esp32/component.mk
View File

@@ -4,11 +4,6 @@
COMPONENT_SRCDIRS := .
ifdef CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
# This linker script must come before esp32.project.ld
LINKER_SCRIPTS += esp32.extram.bss.ld
endif
#Linker scripts used to link the final application.
#Warning: These linker scripts are only used when the normal app is compiled; the bootloader
#specifies its own scripts.

18
components/esp32/ld/esp32.extram.bss.ld
View File

@@ -1,18 +0,0 @@
/* This section is only included if CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
is set, to link some sections to BSS in PSRAM */
SECTIONS
{
/* external memory bss, from any global variable with EXT_RAM_ATTR attribute*/
.ext_ram.bss (NOLOAD) :
{
_ext_ram_bss_start = ABSOLUTE(.);
*(.ext_ram.bss*)
*libnet80211.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
*libpp.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
*liblwip.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
*libbt.a:(EXCLUDE_FILE (libbtdm_app.a) .dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
. = ALIGN(4);
_ext_ram_bss_end = ABSOLUTE(.);
} > extern_ram_seg
}

24
components/esp32/ld/esp32.project.ld.in
View File

@@ -232,12 +232,22 @@ SECTIONS
_noinit_end = ABSOLUTE(.);
} > dram0_0_seg
/* external memory bss, from any global variable with EXT_RAM_ATTR attribute*/
.ext_ram.bss (NOLOAD) :
{
_ext_ram_bss_start = ABSOLUTE(.);
mapping[extern_ram]
. = ALIGN(4);
_ext_ram_bss_end = ABSOLUTE(.);
} > extern_ram_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
{
. = ALIGN (8);
_bss_start = ABSOLUTE(.);
*(.ext_ram.bss*)
_bt_bss_start = ABSOLUTE(.);
*libbt.a:(.bss .bss.* COMMON)
. = ALIGN (4);
@@ -253,18 +263,6 @@ SECTIONS
mapping[dram0_bss]
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.sb.*)
*(.scommon)
*(.sbss2)
*(.sbss2.*)
*(.gnu.linkonce.sb2.*)
*(.dynbss)
*(.share.mem)
*(.gnu.linkonce.b.*)
. = ALIGN (8);
_bss_end = ABSOLUTE(.);
} > dram0_0_seg

26
components/esp32/ld/esp32_fragments.lf
View File

@@ -15,6 +15,18 @@ entries:
entries:
COMMON
[sections:legacy_bss]
entries:
.dynsbss
.sbss+
.gnu.linkonce.sb+
.scommon
.sbss2+
.gnu.linkonce.sb2+
.dynbss
.share.mem
.gnu.linkonce.b+
[sections:rodata]
entries:
.rodata+
@@ -64,6 +76,10 @@ entries:
entries:
.iram.bss+
[sections:extram_bss]
entries:
.ext_ram.bss+
[sections:dram]
entries:
.dram1+
@@ -87,6 +103,11 @@ entries:
data -> dram0_data
bss -> dram0_bss
common -> dram0_bss
if SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY = y:
extram_bss -> extern_ram
else:
extram_bss -> dram0_bss
legacy_bss -> dram0_bss
iram -> iram0_text
iram_data -> iram0_data
iram_bss -> iram0_bss
@@ -130,3 +151,8 @@ entries:
[scheme:wifi_rx_iram]
entries:
wifi_rx_iram -> iram0_text
[scheme:extram_bss]
entries:
bss -> extern_ram
common -> extern_ram