Allow "Run in gdb" action to launch linux-baremetal builds in QEMU

.gitignore

@@ -6,3 +6,4 @@
 /db.conf
 /fail/bin/resultbrowser/app/__pycache__
 /fail/bin/VisualFAIL/CONFIGURATION.php
+/qemu.log

flake.nix

@@ -284,6 +284,7 @@ rec {
           wamrc
           fail-bin
           php
+          qemu_kvm
 
           # perl
 

scripts/build.pl

@@ -219,7 +219,6 @@ if ( grep { $_ eq "fail" } @selected_targets ) {
 # Build everything
 # ========================================================================================= #
 
-# TODO: linux-baremetal target is broken
 system( "mkdir", "-p", "$local_builds_dir" );
 foreach my $experiment (@selected_experiments) {
     foreach my $target (@selected_targets) {

scripts/compile.pl

@@ -123,8 +123,7 @@ my @cross_ldflags_base = (
 my @linux_ldflags_base     = ( '-Wl,--build-id=none', '-m32', '-lm' );
 my @baremetal_ldflags_base = (
     '-Wl,--build-id=none', '-static', '-nostdlib', '-m32',
-    '-lc',                 '-lgcc',   '-lm',       '--entry',
+    '-lc', '-lgcc', '-lm'
-    'main'
 );
 my @cross_ldflags_nowasm = (
     '-Wl,--build-id=none', '-static', '-nostdlib', '-m32',
@@ -192,13 +191,15 @@ sub build {
         compile_c_module( $module, $bd, $target );
         compile_c_host( $module, $bd, $target );
         compile_startup( $module, $bd, $target );
+        compile_syscalls( $module, $bd, $target );
         link_c( $module, $bd, $target );
     }
     else {
         die "Unknown mode '$mode'; expected: aot, interp, c\n";
     }
 
-    build_iso( $module, $bd );
+    build_iso( $module, $bd )
+      if $target eq 'fail' || $target eq 'linux-baremetal';
 }
 
 # ========================================================================================= #
@@ -264,16 +265,17 @@ sub compile_wasm_module {
     if ( Util::module_is_tacle($module) ) {
         my ( $srcs, $inc ) = Util::find_tacle_sources($module);
         Util::run(
-            "$wasi_root/bin/clang",            @wasi_cflags,
+            "$wasi_root/bin/clang",       @wasi_cflags,
-            "-Dmain=tacle_main_bullshit",      "-I$inc",
+            "-Dmain=tacle_main_bullshit", "-DTARGET_WASM",
-            "targets/wasm-module/$module.cpp", @$srcs,
+            "-I$inc",                     "targets/wasm-module/$module.cpp",
-            '-o',                              "$bd/wasm_module.wasm"
+            @$srcs,                       '-o',
+            "$bd/wasm_module.wasm"
         );
     }
     else {
         Util::run( "$wasi_root/bin/clang", @wasi_cflags,
-            "targets/wasm-module/$module.cpp",
+            "-DTARGET_WASM", "targets/wasm-module/$module.cpp",
-            '-o', "$bd/wasm_module.wasm" );
+            '-o',            "$bd/wasm_module.wasm" );
 
     }
 }
@@ -371,9 +373,10 @@ sub compile_wasm_host {
 sub compile_c_module {
     my ( $module, $bd, $target ) = @_;
     my ( $cc, @flags ) =
-        ( $target eq 'linux' )
+        ( $target eq 'linux' ) ? ( $linux_cc, @linux_cflags, '-DTARGET_LINUX' )
-      ? ( $linux_cc, @linux_cflags )
+      : ( $target eq 'linux-baremetal' )
-      : ( $cross_cc, @cross_cflags );
+      ? ( $cross_cc, @linux_baremetal_cflags, '-DTARGET_LINUX_BAREMETAL' )
+      : ( $cross_cc, @cross_cflags, '-DTARGET_FAIL' );
 
     if ( Util::module_is_tacle($module) ) {
         my ( $srcs, $inc ) = Util::find_tacle_sources($module);
@@ -402,8 +405,9 @@ sub compile_c_module {
 sub compile_c_host {
     my ( $module, $bd, $target ) = @_;
     my ( $cc, @flags ) =
-        ( $target eq 'linux' )
+        ( $target eq 'linux' ) ? ( $linux_cc, @linux_cflags, '-DTARGET_LINUX' )
-      ? ( $linux_cc, @linux_cflags, '-DTARGET_LINUX' )
+      : ( $target eq 'linux-baremetal' )
+      ? ( $cross_cc, @linux_baremetal_cflags, '-DTARGET_LINUX_BAREMETAL' )
       : ( $cross_cc, @cross_cflags, '-DTARGET_FAIL' );
     Util::run( $cc, @flags, '-c', 'targets/c-host/c_host.c', '-o',
         "$bd/c_host.o" );
@@ -412,7 +416,7 @@ sub compile_c_host {
 
 sub compile_startup {
     my ( $module, $bd, $target ) = @_;
-    return unless $target eq 'fail';
+    return unless $target eq 'fail' || $target eq 'linux-baremetal';
     Util::run( $cross_cc, 'targets/startup.s', '-I./targets/wasm-host',
         @cross_cflags, '-c', '-o', "$bd/startup.o" );
 }
@@ -448,8 +452,13 @@ sub link_wasm {
             @linux_ldflags_base, '-o', "$bd/system.elf" );
     }
     elsif ( $target eq 'linux-baremetal' ) {
-        Util::run( $cross_cc, "$bd/system.o", "$bd/syscalls.o",
+        Util::run(
-            "$bd/libiwasm.a", @baremetal_ldflags_base, '-o', "$bd/system.elf" );
+            $cross_cc,           '-Wl,-T',
+            'targets/linker.ld', "$bd/system.o",
+            "$bd/startup.o",     "$bd/syscalls.o",
+            "$bd/libiwasm.a",    @baremetal_ldflags_base,
+            '-o',                "$bd/system.elf"
+        );
     }
     else {
         die "Unknown target '$target'\n";
@@ -462,17 +471,28 @@ sub link_c {
       Util::module_is_tacle($module) ? glob("$bd/tacle_*.o") : ();
     if ( $target eq 'fail' ) {
         Util::run(
-            $cross_cc,           '-Wl,-T',
+            $cross_cc,             '-Wl,-T',
-            'targets/linker.ld', "$bd/c_host.o",
+            'targets/linker.ld',   "$bd/c_host.o",
-            "$bd/startup.o",     "$bd/c_module.o",
+            "$bd/startup.o",       "$bd/syscalls.o",
-            @tacle_objs,         @cross_ldflags_nowasm,
+            "$bd/c_module.o",      @tacle_objs,
-            '-o',                "$bd/system.elf"
+            @cross_ldflags_nowasm, '-o',
+            "$bd/system.elf"
         );
     }
     elsif ( $target eq 'linux' ) {
         Util::run( $linux_cc, "$bd/c_host.o", "$bd/c_module.o", @tacle_objs,
             @linux_ldflags_nowasm, '-o', "$bd/system.elf" );
     }
+    elsif ( $target eq 'linux-baremetal' ) {
+        Util::run(
+            $cross_cc,               '-Wl,-T',
+            'targets/linker.ld',     "$bd/c_host.o",
+            "$bd/startup.o",         "$bd/syscalls.o",
+            "$bd/c_module.o",        @tacle_objs,
+            @baremetal_ldflags_base, '-o',
+            "$bd/system.elf"
+        );
+    }
     else {
         die "C mode is not supported for target '$target'\n";
     }

scripts/menu.pl

@@ -33,6 +33,7 @@ my $local_db_conf         = "$local_root/db.conf";
 
 my $resultbrowser_port = '5000';
 my $resultbrowser      = 'resultbrowser.py';
+my $qemu_gdb_port      = '9000';
 
 my $remote_root       = '/home/lab/smchurla/Documents/failnix';
 my $remote_builds_dir = "$remote_root/builds";
@@ -521,13 +522,46 @@ my %handlers = (
         die "No build selected" unless @selected_builds;
         my $selected_build = $selected_builds[0];
 
-        my $build_dir  = "$local_builds_dir/$selected_build";
+        my $build_dir    = "$local_builds_dir/$selected_build";
-        my $build_name = $selected_build =~ s/.*?_.*?_(.*?)_.*$/$1/r;
+        my $build_name   = $selected_build =~ s/.*?_.*?_(.*?)_.*$/$1/r;
+        my $is_baremetal = $selected_build =~ /linux-baremetal$/;
+        my $is_wasm      = $build_name eq 'aot' || $build_name eq 'interp';
 
         say "$build_name";
 
-        system(
+        # Baremetal builds boot the iso in qemu and attach gdb
-            'gdb',
+        my $qemu_pid;
+        if ($is_baremetal) {
+            say "Forking...";
+            $qemu_pid = fork();
+            die "fork failed: $!\n" unless defined $qemu_pid;
+
+            if ( $qemu_pid == 0 ) {
+
+                # child -> qemu.
+                exec(
+                    'qemu-system-i386',
+                    '-drive',
+                    "file=$build_dir/system.iso,media=cdrom",
+                    '-boot',
+                    'd',
+                    '-m',
+                    '32',
+                    '-D',
+                    "$local_root/qemu.log",
+                    '-d',
+                    "int,cpu_reset",
+                    '-no-reboot',
+                    '-no-shutdown',
+                    '-S',
+                    '-gdb',
+                    "tcp::$qemu_gdb_port",
+                ) or die "failed to exec qemu: $!\n";
+            }
+        }
+
+        # Shared gdb args
+        my @gdb_args = (
             '--tui',
             '-q',
             "$build_dir/system.elf",
@@ -537,29 +571,52 @@ my %handlers = (
             "set substitute-path 'build-$build_name' '$build_dir'",
             '-ex',
             "set substitute-path '/build/source/core' '$local_wamr/core'",
-            '-ex',
-            'break main',
-            '-ex',
-            'break fail_start_trace',
-            '-ex',
-            'break fail_stop_trace',
-            '-ex',
-            'break fail_marker_positive',
-            '-ex',
-            'break fail_marker_detected',
-            '-ex',
-            'break fail_marker_negative',
-            '-ex',
-            'break fail_marker_group1',
-            '-ex',
-            'break os_mmap',
-            '-ex',
-            'break wamr_malloc',
-            '-ex',
-            'break wamr_realloc',
-            '-ex',
-            'break wamr_free',
         );
+
+        # Specific gdb args
+        if ($is_baremetal) {
+            push @gdb_args,
+              '-ex', "target remote localhost:$qemu_gdb_port",
+              '-ex', 'break os_main';
+        }
+        else {
+            push @gdb_args, '-ex', 'break main';
+        }
+
+        # Shared breakpoints
+        my @shared_breakpoints = (
+            'fail_start_trace',     'fail_stop_trace',
+            'fail_marker_positive', 'fail_marker_detected',
+            'fail_marker_negative',
+        );
+
+        # Breakpoints for native C
+        my @c_breakpoints = ();
+
+        # Breakpoints for Wasm
+        my @wasm_breakpoints = (
+            'fail_marker_group1',
+
+            # 'os_mmap',
+            # 'wamr_malloc',
+            # 'wamr_realloc',
+            # 'wamr_free',
+        );
+        my @breakpoints = (
+            @shared_breakpoints, $is_wasm ? @wasm_breakpoints : @c_breakpoints,
+        );
+        push @gdb_args, '-ex', "break $_" for @breakpoints;
+
+        # Autostart execution
+        push @gdb_args, '-ex', ( $is_baremetal ? 'continue' : 'run' );
+
+        system( 'gdb', @gdb_args );
+
+        if ($is_baremetal) {
+            say "Killing qemu with pid $qemu_pid...";
+            kill 'TERM', $qemu_pid;
+            waitpid( $qemu_pid, 0 );
+        }
     },
 
     '30. Plot Results' => sub {

targets/lib.h

@@ -10,30 +10,36 @@
 #define IMPORT(fnct) __attribute__((import_module("env"), import_name(fnct)))
 
 #if !defined(TARGET_FAIL) && !defined(TARGET_LINUX_BAREMETAL) &&               \
-    !defined(TARGET_LINUX)
+    !defined(TARGET_LINUX) && !defined(TARGET_WASM)
 // Set to linux while editing to prevent lsp errors
 #define TARGET_LINUX
 #endif
 
+// Both the wasm wrapper and the wasm module use lib.h
+// TARGET_WASM is for the wasm module...
+#ifdef TARGET_WASM
+#define PRINT(fmt, ...) print(fmt)
+#endif
+
+// ...the rest is for the wasm wrapper
 #ifdef TARGET_FAIL
 #define MAIN void os_main(void)
 #define PRINT(fmt, ...)
 #define PRINT_ERROR(fmt, ...)
 #define PRINT_SUCCESS(fmt, ...)
-#define HOST_PRINT(msg)
 #define RET(val) return
 #endif
 
 #ifdef TARGET_LINUX_BAREMETAL
-#define MAIN int main(int argc, char *argv[])
+#define MAIN void os_main(void)
 #define PRINT(fmt, ...)
 #define PRINT_ERROR(fmt, ...)
 #define PRINT_SUCCESS(fmt, ...)
-#define HOST_PRINT(msg)
 #define RET(val) return
 #endif
 
 #ifdef TARGET_LINUX
+#include "stdio.h"
 #define MAIN int main(int argc, char *argv[])
 #define PRINT(fmt, ...) fprintf(stdout, fmt, ##__VA_ARGS__)
 #define PRINT_ERROR(fmt, ...)                                                  \
@@ -42,8 +48,7 @@
 #define PRINT_SUCCESS(fmt, ...)                                                \
   fprintf(stdout, "[Success] ");                                               \
   fprintf(stdout, fmt, ##__VA_ARGS__)
-#define HOST_PRINT(msg) print(msg)
+#define RET(val) return val
-#define RET(val) return val;
 #endif
 
 typedef uint16_t enc_t;

targets/wasm-module/matrix0.cpp

@@ -52,11 +52,11 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
   };
 
   if (cmp(Calculated, Expected)) {
-    HOST_PRINT("result correct.\n");
+    PRINT("result correct.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("result incorrect.\n");
+    PRINT("result incorrect.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/sum0.cpp

@@ -25,11 +25,11 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
   fail_stop_trace();
 
   if (X == 5) {
-    HOST_PRINT("result correct.\n");
+    PRINT("result correct.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("result incorrect.\n");
+    PRINT("result incorrect.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/sum1-voter.cpp

@@ -17,7 +17,7 @@ static void naive_vote(void) {
   } else if (YC == ZC) {
     vote_res = YC;
   } else {
-    HOST_PRINT("all replicas differ.\n");
+    PRINT("all replicas differ.\n");
     fail_marker_detected();
   }
 }
@@ -50,11 +50,11 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
   fail_stop_trace();
 
   if (vote_res == 5) {
-    HOST_PRINT("vote success.\n");
+    PRINT("vote success.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("undetected error.\n");
+    PRINT("undetected error.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/sum2-cored.cpp

@@ -27,7 +27,7 @@ static enc_t sum_out[REPLICA_COUNT];
 
 static INLINE enc_t apply(enc_t vc, sign_t bdyn) {
   if (bdyn > SIG_MAX) {
-    HOST_PRINT("signature overflow.\n");
+    PRINT("signature overflow.\n");
     fail_marker_detected();
   }
   return vc + bdyn;
@@ -49,7 +49,7 @@ static sign_t cored_vote(void) {
     cored_res = apply(XC, (XC - ZC));
     return SIG_s_XZ;
   } else {
-    HOST_PRINT("all replicas differ.\n");
+    PRINT("all replicas differ.\n");
     fail_marker_detected();
     return 0;
   }
@@ -93,7 +93,7 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
     vote_result_sig = SIG_Y;
     break;
   default:
-    HOST_PRINT("unknown static_sig.\n");
+    PRINT("unknown static_sig.\n");
     break;
   }
 
@@ -102,18 +102,18 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
 
   /* Validate Vote result */
   if (!check(cored_res, THE_A, vote_result_sig)) {
-    HOST_PRINT("voted result invalid.\n");
+    PRINT("voted result invalid.\n");
     fail_marker_detected();
     return 2;
   }
 
   plain_t res = decode(cored_res, THE_A, vote_result_sig);
   if (res == 5) {
-    HOST_PRINT("cored success.\n");
+    PRINT("cored success.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("undetected error.\n");
+    PRINT("undetected error.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/sum3-repl-voter.cpp

@@ -17,7 +17,7 @@ static void naive_vote(void) {
   } else if (YC == ZC) {
     vote_res = YC;
   } else {
-    HOST_PRINT("all replicas differ.\n");
+    PRINT("all replicas differ.\n");
     fail_marker_detected();
   }
 }
@@ -50,11 +50,11 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
   fail_stop_trace();
 
   if (vote_res == 5) {
-    HOST_PRINT("vote success.\n");
+    PRINT("vote success.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("undetected error.\n");
+    PRINT("undetected error.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/sum4-repl-cored.cpp

@@ -27,7 +27,7 @@ static enc_t sum_out[REPLICA_COUNT];
 
 static INLINE enc_t apply(enc_t vc, sign_t bdyn) {
   if (bdyn > SIG_MAX) {
-    HOST_PRINT("signature overflow.\n");
+    PRINT("signature overflow.\n");
     fail_marker_detected();
   }
   return vc + bdyn;
@@ -49,7 +49,7 @@ static sign_t cored_vote(void) {
     cored_res = apply(XC, (XC - ZC));
     return SIG_s_XZ;
   } else {
-    HOST_PRINT("all replicas differ.\n");
+    PRINT("all replicas differ.\n");
     fail_marker_detected();
     return 0;
   }
@@ -93,7 +93,7 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
     vote_result_sig = SIG_Y;
     break;
   default:
-    HOST_PRINT("unknown static_sig.\n");
+    PRINT("unknown static_sig.\n");
     break;
   }
 
@@ -102,18 +102,18 @@ extern "C" EXPORT("wasm_module") int wasm_module(void) {
 
   /* Validate Vote result */
   if (!check(cored_res, THE_A, vote_result_sig)) {
-    HOST_PRINT("voted result invalid.\n");
+    PRINT("voted result invalid.\n");
     fail_marker_detected();
     return 2;
   }
 
   plain_t res = decode(cored_res, THE_A, vote_result_sig);
   if (res == 5) {
-    HOST_PRINT("cored success.\n");
+    PRINT("cored success.\n");
     fail_marker_positive();
     return 0;
   } else {
-    HOST_PRINT("undetected error.\n");
+    PRINT("undetected error.\n");
     fail_marker_negative();
     return 1;
   }

targets/wasm-module/tacle-kernel-binarysearch.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = binarysearch_return() - (-1);
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-bsort.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = bsort_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-complex_updates.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = complex_updates_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-countnegative.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = countnegative_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-fft.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = fft_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-matrix1.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = matrix1_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-md5.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = md5_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-quicksort.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = (quicksort_return() - 1527923179 != 0);
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-recursion.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = recursion_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-module/tacle-kernel-sha.cpp

@@ -16,8 +16,10 @@ EXPORT("wasm_module") int wasm_module(void) {
 
   int ret = sha_return();
   if (ret == 0) {
+    PRINT("result correct.\n");
     fail_marker_positive();
   } else {
+    PRINT("result incorrect.\n");
     fail_marker_negative();
   }
   return ret;

targets/wasm-tacle/kernel/countnegative/generated/modified_sources/default/countnegative.c

@@ -28,7 +28,7 @@
 __attribute__((import_module("__pragma"), import_name("loopbound"))) extern void
 __pragma_loopbound(unsigned int min_bound, unsigned int max_bound);
 
-#define MAXSIZE 20
+#define MAXSIZE 8
 
 /*
   Type definition for the matrix

targets/wasm-tacle/kernel/fft/generated/modified_sources/default/fft.c

@@ -71,7 +71,7 @@
 __attribute__((import_module("__pragma"), import_name("loopbound"))) extern void
 __pragma_loopbound(unsigned int min_bound, unsigned int max_bound);
 
-#define N_FFT          1024
+#define N_FFT          16
 #define NUMBER_OF_BITS 13 /* fract format 1.NUMBER_OF_BITS = 1.13 */
 
 #define BITS_PER_TWID 13            /* bits per twiddle coefficient */

targets/wasm-tacle/kernel/recursion/generated/modified_sources/default/recursion.c

@@ -37,7 +37,7 @@ __attribute__((noinline)) __attribute__((export_name("main"))) int main(void);
 
 void
 recursion_init() {
-    int volatile temp_input = 10;
+    int volatile temp_input = 7;
     recursion_input = temp_input;
 }
 
@@ -53,7 +53,7 @@ recursion_fib(int i) {
 
 int
 recursion_return() {
-    return (recursion_result + (-89)) != 0;
+    return (recursion_result + (-21)) != 0;
 }
 
 __attribute__((noinline)) __attribute__((export_name("entrypoint"))) void