Rework the tests to run on pc86; lots of test fixes for the brk() test, which

was nearly useless; lots of fixes to qemuppc and pc86 sbrk(), which was broken;
change the pc86 console to echo output to the serial port (needed for running
tests on qemu).

.travis.yml

@@ -8,6 +8,7 @@ addons:
         packages:
         - ed
         - openbios-ppc
+        - qemu-system-i386
 
 git:
     depth: 10

build.lua

@@ -15,6 +15,7 @@ vars.plats = {
 }
 vars.plats_with_tests = {
 	"qemuppc",
+	"pc86",
 }
 
 local plat_packages = {}

plat/pc86/boot.s

@@ -23,7 +23,7 @@
 ! If you ever need to change the boot code, this needs adjusting. I recommend
 ! a hex editor.
 
-PADDING = 0xB7
+PADDING = 0xB3
 
 ! Some definitions.
 
@@ -271,9 +271,12 @@ finished:
 	
 	! Push standard parameters onto the stack and go.
 	
-	push envp               ! envp
-	push argv               ! argv
-	push 1                  ! argc
+	mov ax, envp
+	push ax
+	mov ax, argv
+	push ax
+	mov ax, 1
+	push ax
 	call __m_a_i_n
 	! fall through into the exit routine.
 	

plat/pc86/include/unistd.h

@@ -37,6 +37,7 @@ extern char** environ;
 
 extern void _exit(int);
 extern pid_t getpid(void);
+extern int brk(void* addr);
 extern void* sbrk(int increment);
 extern int isatty(int d);
 extern off_t lseek(int fildes, off_t offset, int whence);

plat/pc86/libsys/brk.c

@@ -22,7 +22,10 @@ int brk(void* newend)
 	
 	if ((p > (&dummy - STACK_BUFFER)) ||
 	    (p < _end))	
+	{
+		errno = ENOMEM;
 		return -1;
+	}
 		
 	current = p;
 	return 0;
@@ -31,13 +34,26 @@ int brk(void* newend)
 void* sbrk(int increment)
 {
 	char* old;
+	char* new;
 
 	if (increment == 0)
 		return current;
 		
 	old = current;
-	if (brk(old + increment) < 0)
-		return OUT_OF_MEMORY;
+
+	new = old + increment;
+
+	if ((increment > 0) && (new <= old))
+		goto out_of_memory;
+	else if ((increment < 0) && (new >= old))
+		goto out_of_memory;
+
+	if (brk(new) < 0)
+		goto out_of_memory;
 		
 	return old;
+
+out_of_memory:
+	errno = ENOMEM;
+	return OUT_OF_MEMORY;
 }

plat/pc86/tests/build.lua

@@ -0,0 +1,7 @@
+include("tests/plat/build.lua")
+
+plat_testsuite {
+    name = "tests",
+    plat = "pc86",
+    method = "qemu-system-i386"
+}

plat/qemuppc/libsys/brk.c

@@ -34,13 +34,26 @@ int brk(void* newend)
 void* sbrk(int increment)
 {
 	char* old;
+	char* new;
 	
 	if (increment == 0)
 		return current;
 		
 	old = current;
-	if (brk(old + increment) < 0)
-		return OUT_OF_MEMORY;
+
+	new = old + increment;
+
+	if ((increment > 0) && (new <= old))
+		goto out_of_memory;
+	else if ((increment < 0) && (new >= old))
+		goto out_of_memory;
+
+	if (brk(new) < 0)
+		goto out_of_memory;
 		
 	return old;
+
+out_of_memory:
+	errno = ENOMEM;
+	return OUT_OF_MEMORY;
 }

tests/plat/_dummy.c

@@ -6,3 +6,4 @@ void _m_a_i_n(void)
     ASSERT(0 == 0);
     finished();
 }
+

tests/plat/brk_c.c

@@ -7,9 +7,11 @@
 
 int main(int argc, const char* argv[])
 {
-    void* p;
+    char* o;
+    char* p;
 
-    ASSERT(-1 == (intptr_t)brk((void*)0xffffffff));
+    errno = 0;
+    ASSERT(-1 == brk((void*)-1));
     ASSERT(ENOMEM == errno);
 
     p = sbrk(0);
@@ -19,9 +21,29 @@ int main(int argc, const char* argv[])
     ASSERT(p != sbrk(-8));
     ASSERT(p == sbrk(0));
 
-    /* We assume the test environment has less than 2GB of RAM. */
-    ASSERT(-1 == (intptr_t)sbrk(INT_MAX));
-    ASSERT(-1 == (intptr_t)sbrk(INT_MIN));
+    errno = 0;
+    o = sbrk(INT_MAX);
+    if (o == (char*)-1)
+        ASSERT(ENOMEM == errno);
+    else
+    {
+        ASSERT(0 == errno);
+        p = sbrk(0);
+        ASSERT(p > o);
+        brk(o);
+    }
+
+    errno = 0;
+    o = sbrk(INT_MIN);
+    if (o == (char*)-1)
+        ASSERT(ENOMEM == errno);
+    else
+    {
+        ASSERT(0 == errno);
+        p = sbrk(0);
+        ASSERT(p < o);
+        brk(o);
+    }
 
     finished();
 }

tests/plat/build.lua

@@ -14,6 +14,13 @@ definerule("plat_testsuite",
 			"tests/plat/*.p"
 		)
 
+		acklibrary {
+			name = "lib",
+			srcs = { "tests/plat/lib/test.c" },
+			hdrs = { "tests/plat/lib/test.h" },
+			vars = { plat = e.plat },
+		}
+
 		local tests = {}
 		for _, f in ipairs(testfiles) do
 			local fs = replace(basename(f), "%..$", "")
@@ -25,7 +32,7 @@ definerule("plat_testsuite",
 			local bin = ackprogram {
 				name = fs.."_bin",
 				srcs = { f },
-				deps = { "tests/plat/lib+lib" },
+				deps = { "+lib" },
 				vars = {
 					plat = e.plat,
 					lang = lang,

tests/plat/from_d_to_si_e.c

@@ -1,11 +1,12 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
 double one = 1.0;
 double zero = 0.0;
 double minusone = -1.0;
-double big = 2147483647.0;
-double minusbig = -2147483648.0;
+double big = (double)INT_MAX;
+double minusbig = (double)INT_MIN;
 
 /* Bypasses the CRT, so there's no stdio or BSS initialisation. */
 void _m_a_i_n(void)
@@ -13,8 +14,8 @@ void _m_a_i_n(void)
     ASSERT((int)zero == 0);
     ASSERT((int)one == 1);
     ASSERT((int)minusone == -1);
-    ASSERT((int)big == 2147483647);
-    ASSERT((int)minusbig == -2147483648);
+    ASSERT((int)big == INT_MAX);
+    ASSERT((int)minusbig == INT_MIN);
 
     finished();
 }

tests/plat/from_d_to_ui_e.c

@@ -1,16 +1,17 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
 double one = 1.0;
 double zero = 0.0;
-double big = 4294967295.0;
+double big = (double)UINT_MAX;
 
 /* Bypasses the CRT, so there's no stdio or BSS initialisation. */
 void _m_a_i_n(void)
 {
     ASSERT((unsigned int)zero == 0);
     ASSERT((unsigned int)one == 1);
-    ASSERT((unsigned int)big == 4294967295);
+    ASSERT((unsigned int)big == UINT_MAX);
 
     finished();
 }

tests/plat/from_si_to_d_e.c

@@ -1,11 +1,12 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
 int one = 1;
 int zero = 0;
 int minusone = -1;
-int big = 0x7fffffff;
-int minusbig = -0x8000000;
+int big = INT_MAX;
+int minusbig = INT_MIN;
 
 /* Bypasses the CRT, so there's no stdio or BSS initialisation. */
 void _m_a_i_n(void)
@@ -13,8 +14,8 @@ void _m_a_i_n(void)
     ASSERT((double)zero == 0.0);
     ASSERT((double)one == 1.0);
     ASSERT((double)minusone == -1.0);
-    ASSERT((double)big == 2147483647.0);
-    /* ASSERT((double)minusbig == -2147483648.0); FIXME: fails for now */
+    ASSERT((double)big == (double)INT_MAX);
+    /* ASSERT((double)minusbig == (double)INT_MIN); FIXME: fails for now */
 
     finished();
 }

tests/plat/from_ui_to_d_e.c

@@ -1,16 +1,17 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
 unsigned int one_u = 1;
 unsigned int zero_u = 0;
-unsigned int big_u = 0xffffffff;
+unsigned int big_u = UINT_MAX;
 
 /* Bypasses the CRT, so there's no stdio or BSS initialisation. */
 void _m_a_i_n(void)
 {
     ASSERT((double)zero_u == 0.0);
     ASSERT((double)one_u == 1.0);
-    ASSERT((double)big_u == 4294967295.0);
+    ASSERT((double)big_u == (double)UINT_MAX);
 
     finished();
 }

tests/plat/inn_e.e

@@ -1,5 +1,5 @@
 #
-    mes 2, 4, 4
+    mes 2, EM_WSIZE, EM_PSIZE
 
     exp $_m_a_i_n
     pro $_m_a_i_n, 0
@@ -10,12 +10,12 @@
     rom 0I1, 0I1, 0I1, 0I1
     loe .1
     loc 1       /* bit number */
-    inn 4
+    inn EM_WSIZE
     zeq *1
 
     loc __LINE__
     cal $fail
-    ass 4
+    ass EM_WSIZE
 1
 
     /* Test existent bit */
@@ -24,12 +24,12 @@
     rom 2I1, 0I1, 0I1, 0I1
     loe .2
     loc 1       /* bit number */
-    inn 4
+    inn EM_WSIZE
     zne *2
 
     loc __LINE__
     cal $fail
-    ass 4
+    ass EM_WSIZE
 2
 
     /* Test non-existent high bit */
@@ -38,36 +38,44 @@
     rom 0I1, 0I1, 0I1, 0I1
     rom 0I1, 0I1, 0I1, 0I1
 .31
-    rom 33      /* to defeat constant folding */
+    rom (EM_WSIZE*8)+1      /* to defeat constant folding */
 
     lae .3
-    loi 8
+    loi EM_WSIZE*2
     loe .31     /* bit number */
-    inn 8
+    inn EM_WSIZE*2
     zeq *3
 
     loc __LINE__
     cal $fail
-    ass 4
+    ass EM_WSIZE
 3
 
     /* Test existent high bit */
 
 .4
+#if EM_WSIZE == 2
+    rom 0I1, 0I1
+    rom 2I1, 0I1
+#elif EM_WSIZE == 4
     rom 0I1, 0I1, 0I1, 0I1
     rom 2I1, 0I1, 0I1, 0I1
+#else
+    #error Unknown word size
+#endif
+
 .41
-    rom 33      /* to defeat constant folding */
+    rom (EM_WSIZE*8)+1      /* to defeat constant folding */
 
     lae .4
-    loi 8
+    loi EM_WSIZE*2
     loe .41     /* bit number */
-    inn 8
+    inn EM_WSIZE*2
     zne *4
 
     loc __LINE__
     cal $fail
-    ass 4
+    ass EM_WSIZE
 4
 
     cal $finished

tests/plat/intshift_e.c

@@ -1,3 +1,4 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
@@ -25,8 +26,8 @@ void _m_a_i_n(void)
 
     ASSERT(((unsigned int)one     >>(unsigned int)zero) == 1);
     ASSERT(((unsigned int)one     >>(unsigned int)one)  == 0);
-    ASSERT(((unsigned int)minusone>>(unsigned int)zero) == 0xffffffff);
-    ASSERT(((unsigned int)minusone>>(unsigned int)one)  == 0x7fffffff);
+    ASSERT(((unsigned int)minusone>>(unsigned int)zero) == UINT_MAX);
+    ASSERT(((unsigned int)minusone>>(unsigned int)one)  == (UINT_MAX>>1));
 
     ASSERT((one     <<0) == 1);
     ASSERT((one     <<1)  == 2);
@@ -45,8 +46,8 @@ void _m_a_i_n(void)
 
     ASSERT(((unsigned int)one     >>(unsigned int)0) == 1);
     ASSERT(((unsigned int)one     >>(unsigned int)1)  == 0);
-    ASSERT(((unsigned int)minusone>>(unsigned int)0) == 0xffffffff);
-    ASSERT(((unsigned int)minusone>>(unsigned int)1)  == 0x7fffffff);
+    ASSERT(((unsigned int)minusone>>(unsigned int)0) == UINT_MAX);
+    ASSERT(((unsigned int)minusone>>(unsigned int)1)  == (UINT_MAX>>1));
 
     finished();
 }

tests/plat/intsub_e.c

@@ -1,3 +1,4 @@
+#include <limits.h>
 #include "test.h"
 
 /* Constants in globals to defeat constant folding. */
@@ -19,13 +20,13 @@ void _m_a_i_n(void)
     ASSERT((1   - two) == -1);
 
     ASSERT(((unsigned int)two - (unsigned int)one) == 1);
-    ASSERT(((unsigned int)one - (unsigned int)two) == 0xffffffff);
+    ASSERT(((unsigned int)one - (unsigned int)two) == UINT_MAX);
 
     ASSERT(((unsigned int)two - (unsigned int)1) == 1);
-    ASSERT(((unsigned int)one - (unsigned int)2) == 0xffffffff);
+    ASSERT(((unsigned int)one - (unsigned int)2) == UINT_MAX);
 
     ASSERT(((unsigned int)2   - (unsigned int)one) == 1);
-    ASSERT(((unsigned int)1   - (unsigned int)two) == 0xffffffff);
+    ASSERT(((unsigned int)1   - (unsigned int)two) == UINT_MAX);
 
     finished();
 }

tests/plat/lib/build.lua

@@ -4,5 +4,4 @@ acklibrary {
 	name = "lib",
 	srcs = { "./test.c" },
 	hdrs = { "./test.h" },
-	vars = { plat = "qemuppc" }
 }

tests/plat/lib/test.c

@@ -25,7 +25,7 @@ void writehex(uint32_t code)
 
 void fail(uint32_t code)
 {
-    write(1, "@@FAIL on line 0x", 7);
+    write(1, "@@FAIL 0x", 10);
     writehex(code);
     write(1, "\n", 1);
 }

tests/plat/lib/test.h

@@ -9,6 +9,6 @@ extern void writehex(uint32_t code);
 extern void fail(uint32_t code);
 
 #define ASSERT(condition) \
-    if (!(condition)) fail(__LINE__)
+    do { if (!(condition)) fail(__LINE__); } while(0)
 
 #endif

tests/plat/testdriver.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-qemu=$1
+method=$1
 img=$2
 timeout=$3
 
@@ -13,10 +13,25 @@ trap "rm -f $result" EXIT
 pidfile=/tmp/$$.testdriver.pid
 trap "rm -f $pidfile" EXIT
 
-( $qemu -nographic -kernel $img 2>&1 & echo $! > $pidfile ) \
+case $method in
+    qemu-system-*)
+        if ! hash $method 2>/dev/null; then
+            echo "Warning: $method not installed, skipping test"
+            exit 0
+        fi
+
+        case $method in
+            qemu-system-i386) img="-drive file=$img,if=floppy,format=raw" ;;
+            qemu-system-ppc)  img="-kernel $img" ;;
+        esac
+
+        ( $method -nographic $img 2>&1 & echo $! > $pidfile ) \
             | tee $result \
             | ( timeout $timeout grep -l -q @@FINISHED ; echo ) \
             | ( read dummy && kill $(cat $pidfile) )
         
+        ;;
+esac
+
 ( grep -q @@FAIL $result || ! grep -q @@FINISHED $result ) && cat $result && exit 1
 exit 0