From: Alan Cox <alan@linux.intel.com>
Date: Fri, 16 Jan 2015 13:36:58 +0000 (+0000)
Subject: syscall_exec: handle R2L and L2R stacking compilers
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=54068d4c384f699fbadaffaa60256684046b792d;p=FUZIX.git

syscall_exec: handle R2L and L2R stacking compilers
---

diff --git a/Kernel/platform-tgl6502/config.h b/Kernel/platform-tgl6502/config.h
index cabfc8c3..bac8e9d7 100644
--- a/Kernel/platform-tgl6502/config.h
+++ b/Kernel/platform-tgl6502/config.h
@@ -12,6 +12,8 @@
 #undef CONFIG_SINGLETASK
 #define CONFIG_BANKS	2
 
+#define CONFIG_CALL_R2L		/* Runtime stacks arguments backwards */
+
 /* For now used BANK_FIXED as we don't yet have sane swap with 16K maps */
 #define CONFIG_BANK_FIXED
 #define MAX_MAPS 2
diff --git a/Kernel/syscall_exec.c b/Kernel/syscall_exec.c
index d0b5f59d..79683866 100644
--- a/Kernel/syscall_exec.c
+++ b/Kernel/syscall_exec.c
@@ -54,7 +54,6 @@ int16_t _execve(void)
 {
 	staticfast inoptr ino, emu_ino;
 	staticfast unsigned char *buf;
-	staticfast blkno_t blk;
 	char **nargv;		/* In user space */
 	char **nenvp;		/* In user space */
 	staticfast struct s_argblk *abuf, *ebuf;
@@ -256,8 +255,13 @@ int16_t _execve(void)
 	brelse(ebuf);
 
 	// Shove argc and the address of argv just below envp
+#ifdef CONFIG_CALL_R2L	/* Arguments are stacked the 'wrong' way around */
 	uputw((uint16_t) nargv, nenvp - 1);
 	uputw((uint16_t) argc, nenvp - 2);
+#else
+	uputw((uint16_t) nargv, nenvp - 1);
+	uputw((uint16_t) argc, nenvp - 2);
+#endif
 
 	// Set stack pointer for the program
 	udata.u_isp = nenvp - 2;