Support for RP6502 Version 0.14 (#413)

* add RP6502 XREG helper macros

* RP6502 change to RIA.errno_ for macro safety

* settable codepage() on RP6502

* add xreg_ria_gamepad

* remove oserror from platform rp6502

* add rp6502 dir ops

* what's this?

* rp6502 dir inc

* code page

* getcwd

* f_getcwd

Author: rumbledethumps

mos-platform/common/include/unistd.h

@@ -72,6 +72,7 @@ typedef long int off_t;
 int write(int fd, const void* buf, unsigned count);
 int read(int fd, void* buf, unsigned count);
 off_t lseek(int fd, off_t offset, int whence);
+int syncfs (int fd);
 int unlink(const char* name);     /* Same as remove() */
 
 /* Directories */

mos-platform/rp6502/CMakeLists.txt

@@ -26,26 +26,44 @@ merge_libraries(rp6502-crt0
 
 add_platform_library(rp6502-c
   abort.c
+  chdir.c
   clock_getres.c
   clock_gettime.c
   clock_settime.c
   clock.c
   close.c
-  codepage.c
+  code_page.c
+  errno.s
+  f_chdrive.c
+  f_chmod.c
+  f_closedir.c
+  f_getcwd.c
+  f_getfree.c
+  f_getlabel.c
+  f_lseek.c
+  f_mkdir.c
+  f_opendir.c
+  f_readdir.c
+  f_rewinddir.c
+  f_seekdir.c
+  f_setlabel.c
+  f_stat.c
+  f_telldir.c
+  f_utime.c
   getchar.c
   lrand.c
   lseek.c
   open.c
-  oserror.s
   phi2.c
   putchar.c
   read_xram.c
   read_xstack.c
   read.c
+  remove.c
+  rename.c
   ria.s
   stdin_opt.c
-  sysremove.c
-  sysrename.c
+  syncfs.c
   write_xram.c
   write_xstack.c
   write.c

mos-platform/rp6502/chdir.c

@@ -0,0 +1,16 @@
+#include <errno.h>
+#include <rp6502.h>
+#include <string.h>
+#include <unistd.h>
+
+int chdir(const char *name) {
+  size_t namelen = strlen(name);
+  if (namelen > 255) {
+    errno = EINVAL;
+    return -1;
+  }
+  while (namelen) {
+    ria_push_char(name[--namelen]);
+  }
+  return ria_call_int(RIA_OP_CHDIR);
+}

mos-platform/rp6502/clock_gettimespec.c

@@ -3,7 +3,7 @@
 
 /* Internal method shared by clock_getres and clock_gettime. */
 int __clock_gettimespec(struct timespec *ts, unsigned char op) {
-  int ax = ria_call_int_errno(op);
+  int ax = ria_call_int(op);
   if (ax >= 0) {
     ts->tv_sec = ria_pop_long();
     ts->tv_nsec = ria_pop_long();

mos-platform/rp6502/clock_settime.c

@@ -5,5 +5,5 @@ int clock_settime(clockid_t clock_id, const struct timespec *tp) {
   ria_set_ax(clock_id);
   ria_push_long(tp->tv_nsec);
   ria_push_long(tp->tv_sec);
-  return ria_call_int_errno(RIA_OP_CLOCK_SETTIME);
+  return ria_call_int(RIA_OP_CLOCK_SETTIME);
 }

mos-platform/rp6502/close.c

@@ -3,5 +3,5 @@
 
 int close(int fd) {
   ria_set_ax(fd);
-  return ria_call_int_errno(RIA_OP_CLOSE);
+  return ria_call_int(RIA_OP_CLOSE);
 }

mos-platform/rp6502/code_page.c

@@ -0,0 +1,6 @@
+#include "rp6502.h"
+
+int code_page(int cp) {
+  ria_set_ax(cp);
+  return ria_call_int(RIA_OP_CODE_PAGE);
+}

mos-platform/rp6502/codepage.c

@@ -0,0 +1,16 @@
+.include "rp6502.inc"
+
+; The errno on the RP6502 RIA is the errno for llvm-mos.
+; There is no oserror and nothing calls __mappederrno.
+
+.global _errno
+.set _errno, RIA_ERRNO
+
+; Request the RIA use llvm-mos values for RIA_ERRNO
+
+.section .init.100,"ax",@progbits
+  lda #$02 ; 2 = llvm-mos
+  sta RIA_A
+  lda #RIA_OP_ERRNO_OPT
+  sta RIA_OP
+  jsr RIA_SPIN

mos-platform/rp6502/errno.s

@@ -0,0 +1,15 @@
+#include <errno.h>
+#include <rp6502.h>
+#include <string.h>
+
+int f_chdrive(const char *name) {
+  size_t namelen = strlen(name);
+  if (namelen > 255) {
+    errno = EINVAL;
+    return -1;
+  }
+  while (namelen) {
+    ria_push_char(name[--namelen]);
+  }
+  return ria_call_int(RIA_OP_CHDRIVE);
+}