From 84051eb54834ff805fee1c2e0f573d4433a254c2 Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Thu, 24 Oct 2024 15:26:16 -0600
Subject: use #if __unix__

---
 cmd/srv9p/static9p.c |  2 +-
 libcr/coroutine.c    | 87 ++++++++++++++++++++++++++++------------------------
 2 files changed, 48 insertions(+), 41 deletions(-)

diff --git a/cmd/srv9p/static9p.c b/cmd/srv9p/static9p.c
index 47c07be..a5b4492 100644
--- a/cmd/srv9p/static9p.c
+++ b/cmd/srv9p/static9p.c
@@ -168,7 +168,7 @@ struct lib9p_srv_file_vtable static_dir_vtable = {
 static inline size_t static_file_size(struct static_file *file) {
 	assert(file);
 
-#if __x86_64__
+#if __unix__
 	assert(file->data_start);
 #endif
 	if (!file->data_end)
diff --git a/libcr/coroutine.c b/libcr/coroutine.c
index 37a5b1f..568de4e 100644
--- a/libcr/coroutine.c
+++ b/libcr/coroutine.c
@@ -130,20 +130,48 @@
 #if 0
 { /* bracket to get Emacs indentation to work how I want */
 #endif
-#if __arm__ /*======================================================*/
-	/* Assume bare metal ARMv6-M.  */
 
-	#define CR_PLAT_STACK_GROWS_DOWNWARD 1
-
-	/* Wrappers for setjmp()/longjmp() that do *not* save the
-	 * interrupt mask.
-	 *
-	 * newlib does not have sigsetjmp()/sigsetlongjmp(), but
+/*====================================================================
+ * Wrappers for setjmp()/longjmp() that do *not* save the
+ * interrupt mask.  */
+#if __unix__
+	/* On a *NIX OS, we use signals as interrupts.  POSIX leaves
+	 * it implementation-defined whether setjmp()/longjmp() save
+	 * the signal mask; while glibc does not save it, let's not
+	 * rely on that.  */
+	#define cr_plat_setjmp(env)             sigsetjmp(env, 0)
+	#define cr_plat_longjmp(env, val)       siglongjmp(env, val)
+#elif __NEWLIB__
+	/* newlib does not have sigsetjmp()/sigsetlongjmp(), but
 	 * setjmp()/longjmp() do not save the interrupt mask, * so we
 	 * can use them directly.  */
 	#define cr_plat_setjmp(env)             setjmp(env)
 	#define cr_plat_longjmp(env, val)       longjmp(env, val)
+#else
+	#error unsupported platform (not __unix__, not __NEWLIB__)
+#endif
+
+/*====================================================================
+ * Interrupt management routines.  */
+#if __unix__
+	#include <signal.h> /* for sig*, SIG_* */
+	#include <unistd.h> /* for pause() */
 
+	static inline void cr_plat_wait_for_interrupt(void) {
+		pause();
+	}
+	void _cr_plat_disable_interrupts(void) {
+		sigset_t all;
+		sigfillset(&all);
+		sigprocmask(SIG_BLOCK, &all, NULL);
+	}
+	void _cr_plat_enable_interrupts(void) {
+		sigset_t all;
+		sigfillset(&all);
+		sigprocmask(SIG_UNBLOCK, &all, NULL);
+	}
+#elif __arm__
+	/* Assume bare-metal if !__unix__.  */
 	static ALWAYS_INLINE void cr_plat_wait_for_interrupt(void) {
 		asm volatile ("wfi":::"memory");
 	}
@@ -153,6 +181,14 @@
 	void _cr_plat_enable_interrupts(void) {
 		asm volatile ("cpsie i":::"memory");
 	}
+#else
+	#error unsupported platform (not __unix__, not bare-metal __arm__)
+#endif
+
+/*====================================================================
+ * Stack management routines.  */
+#if __arm__
+	#define CR_PLAT_STACK_GROWS_DOWNWARD 1
 
 	#if CONFIG_COROUTINE_MEASURE_STACK
 	static ALWAYS_INLINE uintptr_t cr_plat_get_sp(void) {
@@ -183,37 +219,9 @@
 		              : "r0"
 		              );
 	}
-
-#elif __x86_64__ /*=================================================*/
-	/* Assume POSIX. */
-	#include <signal.h> /* for sig*, SIG_* */
-	#include <unistd.h> /* for pause() */
-
+#elif __x86_64__
 	#define CR_PLAT_STACK_GROWS_DOWNWARD 1
 
-	/* Wrappers for setjmp()/longjmp() that do *not* save the
-	 * interrupt mask.
-	 *
-	 * POSIX leaves it implementation-defined whether they save
-	 * the signal mask; while glibc does not save it, let's not
-	 * rely on that.  */
-	#define cr_plat_setjmp(env)             sigsetjmp(env, 0)
-	#define cr_plat_longjmp(env, val)       siglongjmp(env, val)
-
-	static inline void cr_plat_wait_for_interrupt(void) {
-		pause();
-	}
-	void _cr_plat_disable_interrupts(void) {
-		sigset_t all;
-		sigfillset(&all);
-		sigprocmask(SIG_BLOCK, &all, NULL);
-	}
-	void _cr_plat_enable_interrupts(void) {
-		sigset_t all;
-		sigfillset(&all);
-		sigprocmask(SIG_UNBLOCK, &all, NULL);
-	}
-
 	#if CONFIG_COROUTINE_MEASURE_STACK
 	static ALWAYS_INLINE uintptr_t cr_plat_get_sp(void)  {
 		uintptr_t sp;
@@ -238,11 +246,10 @@
 		              : "rdi"
 		              );
 	}
-
 #else
-	#error unsupported platform
-
+	#error unsupported platform (not __arm__, not __x86__)
 #endif
+
 #if 0
 }
 #endif
-- 
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