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reduce static user RAM footprint for mono targets

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* Make INTC data const (it should've always been)
* Introduce GRODATA3/.gint.rodata.sh3 for that purpose
* Dynamically allocate file descriptor table
This commit is contained in:
Lephe 2023-01-01 19:22:41 +01:00
parent 478fdaea76
commit 736b58f205
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GPG key ID: 1BBA026E13FC0495
6 changed files with 21 additions and 10 deletions
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1
fx9860g.ld
View file

@ -109,6 +109,7 @@ SECTIONS
*(.rodata.4) *(.rodata.4)
*(.rodata .rodata.*) *(.rodata .rodata.*)
*(.gint.rodata.sh3)
} > rom } > rom

2
fxcg50.ld
View file

@ -175,7 +175,7 @@ SECTIONS
/DISCARD/ : { /DISCARD/ : {
/* SH3-only data sections */ /* SH3-only data sections */
*(.gint.data.sh3 .gint.bss.sh3) *(.gint.rodata.sh3 .gint.data.sh3 .gint.bss.sh3)
/* Java class registration (why are they even here?!) */ /* Java class registration (why are they even here?!) */
*(.jcr) *(.jcr)
/* Asynchronous unwind tables: no C++ exception handling */ /* Asynchronous unwind tables: no C++ exception handling */

1
include/gint/defs/attributes.h
View file

@ -10,6 +10,7 @@
/* Objects from the gint's uninitialized BSS section */ /* Objects from the gint's uninitialized BSS section */
#define GBSS __attribute__((section(".gint.bss"))) #define GBSS __attribute__((section(".gint.bss")))
/* Additional sections that are only needed on SH3 */ /* Additional sections that are only needed on SH3 */
#define GRODATA3 __attribute__((section(".gint.rodata.sh3")))
#define GDATA3 __attribute__((section(".gint.data.sh3"))) #define GDATA3 __attribute__((section(".gint.data.sh3")))
#define GBSS3 __attribute__((section(".gint.bss.sh3"))) #define GBSS3 __attribute__((section(".gint.bss.sh3")))
/* Objects for the ILRAM, XRAM and YRAM regions */ /* Objects for the ILRAM, XRAM and YRAM regions */

4
include/gint/mpu/intc.h
View file

@ -298,8 +298,8 @@ typedef struct
//--- //---
/* Provided by intc/intc.c */ /* Provided by intc/intc.c */
extern sh7705_intc_t SH7705_INTC; extern sh7705_intc_t const SH7705_INTC;
extern sh7305_intc_t SH7305_INTC; extern sh7305_intc_t const SH7305_INTC;
#ifdef __cplusplus #ifdef __cplusplus
} }

19
src/fs/fs.c
View file

@ -2,13 +2,14 @@
#include <gint/defs/attributes.h> #include <gint/defs/attributes.h>
#include <unistd.h> #include <unistd.h>
#include <errno.h> #include <errno.h>
#include <stdlib.h>
/* File descriptor table */ /* File descriptor table */
static fs_descriptor_t fdtable[FS_FD_MAX] = { 0 }; static fs_descriptor_t *fdtable;
fs_descriptor_t const *fs_get_descriptor(int fd) fs_descriptor_t const *fs_get_descriptor(int fd)
{ {
if((unsigned)fd >= FS_FD_MAX) if(!fdtable || (unsigned)fd >= FS_FD_MAX)
return NULL; return NULL;
if(fdtable[fd].type == NULL) if(fdtable[fd].type == NULL)
return NULL; return NULL;
@ -18,7 +19,7 @@ fs_descriptor_t const *fs_get_descriptor(int fd)
int fs_create_descriptor(fs_descriptor_t const *data) int fs_create_descriptor(fs_descriptor_t const *data)
{ {
if(data->type == NULL) if(!fdtable || data->type == NULL)
return -1; return -1;
/* Leave 0/1/2 for stdin, stdout and stderr */ /* Leave 0/1/2 for stdin, stdout and stderr */
@ -34,7 +35,7 @@ int fs_create_descriptor(fs_descriptor_t const *data)
void fs_free_descriptor(int fd) void fs_free_descriptor(int fd)
{ {
if((unsigned)fd >= FS_FD_MAX) if(!fdtable || (unsigned)fd >= FS_FD_MAX)
return; return;
fdtable[fd].type = NULL; fdtable[fd].type = NULL;
@ -43,6 +44,10 @@ void fs_free_descriptor(int fd)
int open_generic(fs_descriptor_type_t *type, void *data, int fd) int open_generic(fs_descriptor_type_t *type, void *data, int fd)
{ {
if(!fdtable) {
errno = ENOMEM;
return -1;
}
if(!type) { if(!type) {
errno = EINVAL; errno = EINVAL;
return -1; return -1;
@ -81,8 +86,12 @@ static fs_descriptor_type_t devnull = {
.close = NULL, .close = NULL,
}; };
GCONSTRUCTOR static void init_standard_streams(void) GCONSTRUCTOR static void init_fs(void)
{ {
fdtable = malloc(FS_FD_MAX * sizeof *fdtable);
if(!fdtable)
return;
fdtable[STDIN_FILENO].type = &devnull; fdtable[STDIN_FILENO].type = &devnull;
fdtable[STDIN_FILENO].data = NULL; fdtable[STDIN_FILENO].data = NULL;

4
src/intc/intc.c
View file

@ -12,7 +12,7 @@
// Interrupt controllers // Interrupt controllers
//--- //---
GDATA3 sh7705_intc_t SH7705_INTC = { GRODATA3 sh7705_intc_t const SH7705_INTC = {
.IPR = { .IPR = {
(void *)0xfffffee2, (void *)0xfffffee4, (void *)0xfffffee2, (void *)0xfffffee4,
(void *)0xa4000016, (void *)0xa4000018, (void *)0xa400001a, (void *)0xa4000016, (void *)0xa4000018, (void *)0xa400001a,
@ -21,7 +21,7 @@ GDATA3 sh7705_intc_t SH7705_INTC = {
.ICR1 = (void *)0xa4000010, .ICR1 = (void *)0xa4000010,
}; };
sh7305_intc_t SH7305_INTC = { sh7305_intc_t const SH7305_INTC = {
.IPR = (void *)0xa4080000, .IPR = (void *)0xa4080000,
.MSK = (void *)0xa4080080, .MSK = (void *)0xa4080080,
.MSKCLR = (void *)0xa40800c0, .MSKCLR = (void *)0xa40800c0,