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Merge pull request #504 from DiUS/loadnon32 

Move const data to ROM, freeing up ~16k of RAM
This commit is contained in:
Vowstar 2015-06-26 13:33:40 +08:00
parent 7d38687767 b0f9788a6d
commit 2c53149bee
8 changed files with 211 additions and 6 deletions
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2
app/Makefile
View File

@ -99,7 +99,7 @@ LINKFLAGS_eagle.app.v6 = \
-nostdlib \
-T$(LD_FILE) \
-Wl,--no-check-sections \
-u call_user_start \
-Wl,--wrap=_xtos_set_exception_handler \
-Wl,-static \
-Wl,--start-group \
-lc \

54
app/include/rom.h
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@ -37,3 +37,57 @@ extern unsigned char * base64_decode(const unsigned char *src, size_t len, size_
// initialized because it uses mem_malloc
extern void mem_init(void * start_addr);
// Hardware exception handling
struct exception_frame
{
uint32_t epc;
uint32_t ps;
uint32_t sar;
uint32_t unused;
union {
struct {
uint32_t a0;
// note: no a1 here!
uint32_t a2;
uint32_t a3;
uint32_t a4;
uint32_t a5;
uint32_t a6;
uint32_t a7;
uint32_t a8;
uint32_t a9;
uint32_t a10;
uint32_t a11;
uint32_t a12;
uint32_t a13;
uint32_t a14;
uint32_t a15;
};
uint32_t a_reg[15];
};
uint32_t cause;
};
/**
* C-level exception handler callback prototype.
*
* Does not need an RFE instruction - it is called through a wrapper which
* performs state capture & restore, as well as the actual RFE.
*
* @param ef An exception frame containing the relevant state from the
* exception triggering. This state may be manipulated and will
* be applied on return.
* @param cause The exception cause number.
*/
typedef void (*exception_handler_fn) (struct exception_frame *ef, uint32_t cause);
/**
* Sets the exception handler function for a particular exception cause.
* @param handler The exception handler to install.
* If NULL, reverts to the XTOS default handler.
* @returns The previous exception handler, or NULL if none existed prior.
*/
exception_handler_fn _xtos_set_exception_handler (uint32_t cause, exception_handler_fn handler);

112
app/user/user_exceptions.c Normal file
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@ -0,0 +1,112 @@
/*
* Copyright 2015 Dius Computing Pty Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
* - Neither the name of the copyright holders nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @author Johny Mattsson <jmattsson@dius.com.au>
*/
#include "user_exceptions.h"
#define LOAD_MASK 0x00f00fu
#define L8UI_MATCH 0x000002u
#define L16UI_MATCH 0x001002u
#define L16SI_MATCH 0x009002u
void load_non_32_wide_handler (struct exception_frame *ef, uint32_t cause)
{
/* If this is not EXCCAUSE_LOAD_STORE_ERROR you're doing it wrong! */
(void)cause;
uint32_t epc1 = ef->epc;
uint32_t excvaddr;
uint32_t insn;
asm (
"rsr %0, EXCVADDR;" /* read out the faulting address */
"movi a4, ~3;" /* prepare a mask for the EPC */
"and a4, a4, %2;" /* apply mask for 32bit aligned base */
"l32i a5, a4, 0;" /* load part 1 */
"l32i a6, a4, 4;" /* load part 2 */
"ssa8l %2;" /* set up shift register for src op */
"src %1, a6, a5;" /* right shift to get faulting instruction */
:"=r"(excvaddr), "=r"(insn)
:"r"(epc1)
:"a4", "a5", "a6"
);
uint32_t valmask = 0;
uint32_t what = insn & LOAD_MASK;
if (what == L8UI_MATCH)
valmask = 0xffu;
else if (what == L16UI_MATCH || what == L16SI_MATCH)
valmask = 0xffffu;
else
{
die:
/* Turns out we couldn't fix this, trigger a system break instead
* and hang if the break doesn't get handled. This is effectively
* what would happen if the default handler was installed. */
asm ("break 1, 1");
while (1) {}
}
/* Load, shift and mask down to correct size */
uint32_t val = (*(uint32_t *)(excvaddr & ~0x3));
val >>= (excvaddr & 0x3) * 8;
val &= valmask;
/* Sign-extend for L16SI, if applicable */
if (what == L16SI_MATCH && (val & 0x8000))
val |= 0xffff0000;
int regno = (insn & 0x0000f0u) >> 4;
if (regno == 1)
goto die; /* we can't support loading into a1, just die */
else if (regno != 0)
--regno; /* account for skipped a1 in exception_frame */
ef->a_reg[regno] = val; /* carry out the load */
ef->epc += 3; /* resume at following instruction */
}
/**
* The SDK's user_main function installs a debugging handler regardless
* of whether there's a proper handler installed for EXCCAUSE_LOAD_STORE_ERROR,
* which of course breaks everything if we allow that to go through. As such,
* we use the linker to wrap that call and stop the SDK from shooting itself in
* its proverbial foot.
*/
exception_handler_fn
__wrap__xtos_set_exception_handler (uint32_t cause, exception_handler_fn fn)
{
if (cause != EXCCAUSE_LOAD_STORE_ERROR)
__real__xtos_set_exception_handler (cause, fn);
}

5
app/user/user_exceptions.h Normal file
View File

@ -0,0 +1,5 @@
#include "c_types.h"
#include "rom.h"
#include <xtensa/corebits.h>
void load_non_32_wide_handler (struct exception_frame *ef, uint32_t cause) TEXT_SECTION_ATTR;

16
app/user/user_main.c
View File

@ -16,6 +16,7 @@
#include "flash_fs.h"
#include "user_interface.h"
#include "user_exceptions.h"
#include "ets_sys.h"
#include "driver/uart.h"
@ -25,6 +26,21 @@
#define TASK_QUEUE_LEN 4
os_event_t *taskQueue;
/* Note: the trampoline *must* be explicitly put into the .text segment, since
* by the time it is invoked the irom has not yet been mapped. This naturally
* also goes for anything the trampoline itself calls.
*/
void user_start_trampoline (void) TEXT_SECTION_ATTR;
void user_start_trampoline (void)
{
__real__xtos_set_exception_handler (
EXCCAUSE_LOAD_STORE_ERROR, load_non_32_wide_handler);
call_user_start ();
}
void task_lua(os_event_t *e){
char* lua_argv[] = { (char *)"lua", (char *)"-i", NULL };
NODE_DBG("Task task_lua started.\n");

3
include/c_types.h
View File

@ -84,6 +84,9 @@ typedef enum {
#define ICACHE_FLASH_ATTR
#endif /* ICACHE_FLASH */
#define TEXT_SECTION_ATTR __attribute__((section(".text")))
#define RAM_CONST_ATTR __attribute__((section(".text")))
#ifndef __cplusplus
typedef unsigned char bool;
#define BOOL bool

9
ld/eagle.app.v6.ld
View File

@ -19,7 +19,7 @@ PHDRS
/* Default entry point: */
ENTRY(call_user_start)
ENTRY(user_start_trampoline)
PROVIDE(_memmap_vecbase_reset = 0x40000000);
/* Various memory-map dependent cache attribute settings: */
_memmap_cacheattr_wb_base = 0x00000110;
@ -75,6 +75,10 @@ SECTIONS
/* put font and progmem data into irom0 */
*(.u8g_progmem.*)
/* Trade some performance for lots of ram. At the time of writing the
* available Lua heap went from 18248 to 34704. */
*(.rodata*)
_irom0_text_end = ABSOLUTE(.);
_flash_used_end = ABSOLUTE(.);
} >irom0_0_seg :irom0_0_phdr
@ -124,10 +128,7 @@ SECTIONS
.rodata : ALIGN(4)
{
_rodata_start = ABSOLUTE(.);
*(.rodata)
*(.rodata.*)
*(.gnu.linkonce.r.*)
*(.rodata1)
__XT_EXCEPTION_TABLE__ = ABSOLUTE(.);
*(.xt_except_table)
*(.gcc_except_table)

16
tools/esptool.py
View File

@ -360,6 +360,20 @@ class ELFFile:
self._fetch_symbols()
return self.symbols[sym]
def get_entry_point(self):
tool_readelf = "xtensa-lx106-elf-readelf"
if os.getenv('XTENSA_CORE')=='lx106':
tool_objcopy = "xt-readelf"
try:
proc = subprocess.Popen([tool_readelf, "-h", self.name], stdout=subprocess.PIPE)
except OSError:
print "Error calling "+tool_nm+", do you have Xtensa toolchain in PATH?"
sys.exit(1)
for l in proc.stdout:
fields = l.strip().split()
if fields[0] == "Entry":
return int(fields[3], 0);
def load_section(self, section):
tool_objcopy = "xtensa-lx106-elf-objcopy"
if os.getenv('XTENSA_CORE')=='lx106':
@ -586,7 +600,7 @@ if __name__ == '__main__':
args.output = args.input + '-'
e = ELFFile(args.input)
image = ESPFirmwareImage()
image.entrypoint = e.get_symbol_addr("call_user_start")
image.entrypoint = e.get_entry_point()
for section, start in ((".text", "_text_start"), (".data", "_data_start"), (".rodata", "_rodata_start")):
data = e.load_section(section)
image.add_segment(e.get_symbol_addr(start), data)