From 68354f444728ef99bb51bb4d86e8f1b40853a898 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Thu, 6 Nov 2025 00:42:02 +0100
Subject: Allow mcode allocations outside of the jump range to the support
 code.

Thank you for your patience. #285
---
 src/lib_jit.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'src/lib_jit.c')

diff --git a/src/lib_jit.c b/src/lib_jit.c
index fd8e585b..1b74d957 100644
--- a/src/lib_jit.c
+++ b/src/lib_jit.c
@@ -479,12 +479,21 @@ static int jitopt_param(jit_State *J, const char *str)
     size_t len = *(const uint8_t *)lst;
     lj_assertJ(len != 0, "bad JIT_P_STRING");
     if (strncmp(str, lst+1, len) == 0 && str[len] == '=') {
-      int32_t n = 0;
+      uint32_t n = 0;
       const char *p = &str[len+1];
       while (*p >= '0' && *p <= '9')
 	n = n*10 + (*p++ - '0');
-      if (*p) return 0;  /* Malformed number. */
-      J->param[i] = n;
+      if (*p || (int32_t)n < 0) return 0;  /* Malformed number. */
+      if (i == JIT_P_sizemcode) {  /* Adjust to required range here. */
+#if LJ_TARGET_JUMPRANGE
+	uint32_t maxkb = ((1 << (LJ_TARGET_JUMPRANGE - 10)) - 64);
+#else
+	uint32_t maxkb = ((1 << (31 - 10)) - 64);
+#endif
+	n = (n + (LJ_PAGESIZE >> 10) - 1) & ~((LJ_PAGESIZE >> 10) - 1);
+	if (n > maxkb) n = maxkb;
+      }
+      J->param[i] = (int32_t)n;
       if (i == JIT_P_hotloop)
 	lj_dispatch_init_hotcount(J2G(J));
       return 1;  /* Ok. */
-- 
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