Modify the linker script to move some code into flash, enable -mtext-section-literals

hardware/arduino/esp8266/cores/esp8266/abi.cpp

@@ -17,19 +17,39 @@
 */
 
 #include <stdlib.h>
+extern "C" {
+#include "ets_sys.h"
+#include "os_type.h"
+#include "osapi.h"
+#include "mem.h"
+#include "user_interface.h"
+}
+
+void *operator new(size_t size) {
+  return os_malloc(size);
+}
+
+void *operator new[](size_t size) {
+  return os_malloc(size);
+}
+
+void operator delete(void * ptr) {
+  os_free(ptr);
+}
+
+void operator delete[](void * ptr) {
+  os_free(ptr);
+}
 
 extern "C" void __cxa_pure_virtual(void) __attribute__ ((__noreturn__));
 extern "C" void __cxa_deleted_virtual(void) __attribute__ ((__noreturn__));
 
 void __cxa_pure_virtual(void) {
-  // We might want to write some diagnostics to uart in this case
-  //std::terminate();
   abort();
 }
 
 void __cxa_deleted_virtual(void) {
-  // We might want to write some diagnostics to uart in this case
-  //std::terminate();
   abort();
 }
 
+

hardware/arduino/esp8266/cores/esp8266/core_esp8266_wiring_digital.c

@@ -27,6 +27,7 @@
 #define ARDUINO_MAIN
 #include "wiring_private.h"
 #include "pins_arduino.h"
+#include "c_types.h"
 #include "eagle_soc.h"
 #include "gpio.h"
 
@@ -68,6 +69,12 @@ static const uint32_t g_pin_funcs[PINCOUNT] = {
 };
 
 
+enum PinFunction { GPIO, PWM };
+static uint32_t g_gpio_function[PINCOUNT] = {
+    GPIO
+};
+
+
 void pinMode(uint8_t pin, uint8_t mode)
 {
     uint32_t mux = g_pin_muxes[pin];

hardware/arduino/esp8266/cores/esp8266/new.cpp

@@ -1,43 +0,0 @@
-/*
-  Copyright (c) 2014 Arduino.  All right reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-  See the GNU Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-#include <stdlib.h>
-extern "C" {
-#include "ets_sys.h"
-#include "os_type.h"
-#include "osapi.h"
-#include "mem.h"
-#include "user_interface.h"
-}
-
-void *operator new(size_t size) {
-  return os_malloc(size);
-}
-
-void *operator new[](size_t size) {
-  return os_malloc(size);
-}
-
-void operator delete(void * ptr) {
-  os_free(ptr);
-}
-
-void operator delete[](void * ptr) {
-  os_free(ptr);
-}
-

hardware/arduino/esp8266/cores/esp8266/new.h

@@ -1,30 +0,0 @@
-/*
-  Copyright (c) 2014 Arduino.  All right reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-  See the GNU Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-#ifndef NEW_H
-#define NEW_H
-
-#include <stdlib.h>
-
-void * operator new(size_t size);
-void * operator new[](size_t size);
-void operator delete(void * ptr);
-void operator delete[](void * ptr);
-
-#endif
-

hardware/arduino/esp8266/platform.txt

@@ -15,7 +15,7 @@ compiler.sdk.path={compiler.tools.path}/sdk/
 compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -I{compiler.sdk.path}/include
 
 compiler.c.cmd=xtensa-lx106-elf-gcc
-compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -MMD -std=c99
+compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals -MMD -std=c99
 
 compiler.c.elf.ldscript=eagle.app.v6.ld
 compiler.c.elf.flags=-nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -L{compiler.sdk.path}/lib -L{compiler.sdk.path}/ld -T{compiler.c.elf.ldscript}
@@ -23,7 +23,7 @@ compiler.c.elf.cmd=xtensa-lx106-elf-gcc
 compiler.c.elf.libs=-lc -lgcc -lhal -lphy -lnet80211 -llwip -lwpa -lmain
 
 compiler.cpp.cmd=xtensa-lx106-elf-g++
-compiler.cpp.flags=-c -Os -mlongcalls -fno-exceptions -fno-rtti -std=c++11 -MMD 
+compiler.cpp.flags=-c -Os -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -std=c++11 -MMD 
 
 compiler.as.cmd=xtensa-lx106-elf-as
 

hardware/tools/esp8266/sdk/ld/eagle.app.v6.ld

@@ -148,6 +148,15 @@ SECTIONS
   } >dram0_0_seg :dram0_0_bss_phdr
 /* __stack = 0x3ffc8000; */
 
+  .irom0.text : ALIGN(4)
+  {
+    _irom0_text_start = ABSOLUTE(.);
+    *core_esp8266_*.o(.literal*, .text*)
+    *.cpp.o(.literal*, .text*)
+    *(.irom0.literal .irom.literal .irom.text.literal .irom0.text .irom.text)
+    _irom0_text_end = ABSOLUTE(.);
+  } >irom0_0_seg :irom0_0_phdr
+
   .text : ALIGN(4)
   {
     _stext = .;
@@ -172,12 +181,7 @@ SECTIONS
     _lit4_end = ABSOLUTE(.);
   } >iram1_0_seg :iram1_0_phdr
 
-  .irom0.text : ALIGN(4)
-  {
-    _irom0_text_start = ABSOLUTE(.);
-    *(.irom0.literal .irom.literal .irom.text.literal .irom0.text .irom.text)
-    _irom0_text_end = ABSOLUTE(.);
-  } >irom0_0_seg :irom0_0_phdr
+
 }
 
 /* get ROM code address */