--- webkitgtk-2.49.90/Source/bmalloc/bmalloc/BPlatform.h.~2~	2025-09-02 16:34:26.285424660 +0000
+++ webkitgtk-2.49.90/Source/bmalloc/bmalloc/BPlatform.h	2025-09-03 18:19:37.160688282 +0000
@@ -353,7 +353,7 @@
 
 /* BENABLE(LIBPAS) is enabling libpas build. But this does not mean we use libpas for bmalloc replacement. */
 #if !defined(BENABLE_LIBPAS)
-#if BCPU(ADDRESS64) && (BOS(DARWIN) || BOS(WINDOWS) || (BOS(LINUX) && (BCPU(X86_64) || BCPU(ARM64))) || BPLATFORM(PLAYSTATION))
+#if BCPU(ADDRESS64) && (BOS(DARWIN) || BOS(SOLARIS) || BOS(WINDOWS) || (BOS(LINUX) && (BCPU(X86_64) || BCPU(ARM64))) || BPLATFORM(PLAYSTATION))
 #define BENABLE_LIBPAS 1
 #ifndef PAS_BMALLOC
 #define PAS_BMALLOC 1
@@ -365,7 +365,7 @@
 
 /* BUSE(LIBPAS) is using libpas for bmalloc replacement. */
 #if !defined(BUSE_LIBPAS)
-#if defined(BENABLE_LIBPAS) && BENABLE_LIBPAS
+#if defined(BENABLE_LIBPAS) && BENABLE_LIBPAS && !BOS(SOLARIS)
 #define BUSE_LIBPAS 1
 #else
 #define BUSE_LIBPAS 0
--- webkit/Source/bmalloc/libpas/src/libpas/pas_platform.h~	2025-07-01 12:43:55.000000000 +0000
+++ webkit/Source/bmalloc/libpas/src/libpas/pas_platform.h	2025-07-01 15:58:59.097739710 +0000
@@ -140,6 +140,10 @@
 #define PAS_OS_FREEBSD 1
 #endif
 
+#if defined(__sun)
+#define PAS_OS_SOLARIS 1
+#endif
+
 #if defined(WIN32) || defined(_WIN32)
 #define PAS_OS_WINDOWS 1
 #endif
--- webkit/Source/bmalloc/libpas/src/libpas/pas_committed_pages_vector.h~	2025-07-01 12:43:55.000000000 +0000
+++ webkit/Source/bmalloc/libpas/src/libpas/pas_committed_pages_vector.h	2025-07-01 15:54:48.229643471 +0000
@@ -32,6 +32,21 @@
 #include <sys/mman.h>
 #endif
 
+#if PAS_OS(SOLARIS)
+#ifndef MINCORE_REFERENCED
+#define MINCORE_REFERENCED       0x1
+#endif
+#ifndef MINCORE_REFERENCED_OTHER
+#define MINCORE_REFERENCED_OTHER 0x1
+#endif
+#ifndef MINCORE_MODIFIED
+#define MINCORE_MODIFIED         0x0
+#endif
+#ifndef MINCORE_MODIFIED_OTHER
+#define MINCORE_MODIFIED_OTHER   0x0
+#endif
+#endif
+
 PAS_BEGIN_EXTERN_C;
 
 struct pas_allocation_config;
--- webkitgtk-2.49.90/Source/bmalloc/libpas/src/libpas/pas_monotonic_time.c.~1~	2025-08-08 10:17:56.292456200 +0000
+++ webkitgtk-2.49.90/Source/bmalloc/libpas/src/libpas/pas_monotonic_time.c	2025-09-07 15:28:31.473975261 +0000
@@ -40,6 +40,10 @@
 #include <time.h>
 #endif
 
+#if PAS_OS(SOLARIS)
+#include <sys/time.h>
+#endif
+
 #if PAS_OS(DARWIN)
 static mach_timebase_info_data_t timebase_info;
 static mach_timebase_info_data_t* timebase_info_ptr;
@@ -79,6 +83,15 @@
     return result;
 }
 
+#elif PAS_OS(SOLARIS)
+
+uint64_t pas_get_current_monotonic_time_nanoseconds(void)
+{
+    // this function is in a hotpath; gethrtime(3C) is a monotonic
+    // nanosecond clock that runs with no syscall overhead
+    return gethrtime();
+}
+
 #elif PAS_OS(LINUX)
 
 uint64_t pas_get_current_monotonic_time_nanoseconds(void)
--- webkit/Source/bmalloc/libpas/src/libpas/pas_page_malloc.c~	2025-07-01 12:43:55.000000000 +0000
+++ webkit/Source/bmalloc/libpas/src/libpas/pas_page_malloc.c	2025-07-02 17:35:13.694435809 +0000
@@ -325,6 +325,8 @@
     // We don't need to call madvise to map page.
 #elif PAS_OS(FREEBSD)
     PAS_SYSCALL(madvise(ptr, size, MADV_NORMAL));
+#elif PAS_OS(SOLARIS)
+    PAS_SYSCALL(posix_madvise(ptr, size, POSIX_MADV_NORMAL));
 #endif
 }
 
@@ -368,6 +370,8 @@
         PAS_SYSCALL(madvise(ptr, size, MADV_FREE_REUSABLE));
 #elif PAS_OS(FREEBSD)
     PAS_SYSCALL(madvise(ptr, size, MADV_FREE));
+#elif PAS_OS(SOLARIS)
+    PAS_SYSCALL(posix_madvise(ptr, size, POSIX_MADV_DONTNEED));
 #elif PAS_OS(LINUX)
     PAS_SYSCALL(madvise(ptr, size, MADV_DONTNEED));
     PAS_SYSCALL(madvise(ptr, size, MADV_DONTDUMP));