BSD: arm support

Support OpenBSD/FreeBSD/NetBSD on asm.

move PAGESIZE to tcc.h and use _SC_PAGESIZE (netbsd/arm has 8192 pagesize)

arm:
- fix cmp instruction for qemu (raspberry pi works without patch?)
- increase start address/size
- use large plt size
- add return R_ARM_PREL31
- add R_ARM_TARGET1 to prepare_dynamic_rel
- add gcc_s to FreeBSD (unwind code)
- do not use __clear_cache on bsd (sometimes bad system call)
- do stack unwinding on bsd
- test/tcctest.c: use %lld %llu on bsd

arm-gen.c

@@ -1674,8 +1674,12 @@ void gen_opi(int op)
 	uint32_t x;
 	x=stuff_const(opc|0x2000000|(c<<16),vtop->c.i);
 	if(x) {
+	  if ((x & 0xfff00000) == 0xe3500000)   // cmp rx,#c
+	    o(x);
+	  else {
 	    r=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
 	    o(x|(r<<12));
+	  }
 	  goto done;
 	}
       }
@@ -1685,8 +1689,12 @@ void gen_opi(int op)
         c=intr(gv(RC_INT));
         vswap();
       }
+      if ((opc & 0xfff00000) == 0xe1500000) // cmp rx,ry
+	o(opc|(c<<16)|fr);
+      else {
         r=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
         o(opc|(c<<16)|(r<<12)|fr);
+      }
 done:
       vtop--;
       if (op >= TOK_ULT && op <= TOK_GT)

arm-link.c

@@ -12,8 +12,8 @@
 
 #define R_NUM       R_ARM_NUM
 
-#define ELF_START_ADDR 0x00008000
-#define ELF_PAGE_SIZE  0x1000
+#define ELF_START_ADDR 0x00010000
+#define ELF_PAGE_SIZE  0x10000
 
 #define PCRELATIVE_DLLPLT 1
 #define RELOCATE_DLLPLT 1
@@ -127,7 +127,7 @@ ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_
         write32le(p,   0x4778); /* bx pc */
         write32le(p+2, 0x46c0); /* nop   */
     }
-    p = section_ptr_add(plt, 12);
+    p = section_ptr_add(plt, 16);
     /* save GOT offset for relocate_plt */
     write32le(p + 4, got_offset);
     return plt_offset;
@@ -153,10 +153,11 @@ ST_FUNC void relocate_plt(TCCState *s1)
 	    unsigned off = x  + read32le(p + 4) + (s1->plt->data - p) + 4;
             if (read32le(p) == 0x46c04778) /* PLT Thumb stub present */
                 p += 4;
-            write32le(p, 0xe28fc600 | ((off >> 20) & 0xff));     // add ip, pc, #0xNN00000
-            write32le(p + 4, 0xe28cca00 | ((off >> 12) & 0xff)); // add ip, ip, #0xNN000
-            write32le(p + 8, 0xe5bcf000 | (off & 0xfff));	 // ldr pc, [ip, #0xNNN]!
-            p += 12;
+            write32le(p, 0xe28fc200 | ((off >> 28) & 0xf));      // add ip, pc, #0xN0000000
+            write32le(p + 4, 0xe28cc600 | ((off >> 20) & 0xff)); // add ip, pc, #0xNN00000
+            write32le(p + 8, 0xe28cca00 | ((off >> 12) & 0xff)); // add ip, ip, #0xNN000
+            write32le(p + 12, 0xe5bcf000 | (off & 0xfff));	 // ldr pc, [ip, #0xNNN]!
+            p += 16;
         }
     }
 }
@@ -346,6 +347,7 @@ void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t
                     tcc_error("can't relocate value at %x,%d",addr, type);
                 (*(int *)ptr) |= x & 0x7fffffff;
             }
+            return;
         case R_ARM_ABS32:
      // case R_ARM_TARGET1: /* ??? as seen on NetBSD - FIXME! */
             if (s1->output_type == TCC_OUTPUT_DLL) {

tcc.h

@@ -86,6 +86,14 @@ extern long double strtold (const char *__nptr, char **__endptr);
 # undef CONFIG_TCC_STATIC
 #endif
 
+#ifndef PAGESIZE
+# ifdef _SC_PAGESIZE
+#   define PAGESIZE sysconf(_SC_PAGESIZE)
+# else
+#   define PAGESIZE 4096
+# endif
+#endif
+
 #ifndef O_BINARY
 # define O_BINARY 0
 #endif

tccelf.c

@@ -1055,6 +1055,7 @@ static int prepare_dynamic_rel(TCCState *s1, Section *sr)
         case R_X86_64_64:
 #elif defined(TCC_TARGET_ARM)
         case R_ARM_ABS32:
+        case R_ARM_TARGET1:
 #elif defined(TCC_TARGET_ARM64)
         case R_AARCH64_ABS32:
         case R_AARCH64_ABS64:
@@ -1445,6 +1446,9 @@ ST_FUNC void tcc_add_runtime(TCCState *s1)
                 tcc_add_dll(s1, TCC_LIBGCC, 0);
         }
 #endif
+#if defined(TCC_TARGET_ARM) && defined(TARGETOS_FreeBSD)
+        tcc_add_library_err(s1, "gcc_s"); // unwind code
+#endif
 #ifdef CONFIG_TCC_BCHECK
         if (s1->do_bounds_check && s1->output_type != TCC_OUTPUT_DLL) {
             tcc_add_library_err(s1, "pthread");

tccrun.c

@@ -352,7 +352,10 @@ static void set_pages_executable(TCCState *s1, void *ptr, unsigned long length)
     if (mprotect((void *)start, end - start, PROT_READ | PROT_EXEC))
         tcc_error("mprotect failed: did you mean to configure --with-selinux?");
 # endif
-# if defined TCC_TARGET_ARM || defined TCC_TARGET_ARM64
+/* XXX: BSD sometimes dump core with bad system call */
+# if (defined(TCC_TARGET_ARM) && \
+      !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)) || \
+     defined(TCC_TARGET_ARM64)
 #  ifdef __APPLE__
     sys_icache_invalidate(ptr, length);
     sys_dcache_flush(ptr, length);
@@ -691,6 +694,12 @@ static void rt_getcontext(ucontext_t *uc, rt_context *rc)
 # if defined(__APPLE__)
     rc->ip = uc->uc_mcontext->__ss.__pc;
     rc->fp = uc->uc_mcontext->__ss.__r[11];
+# elif defined(__FreeBSD__) || defined(__NetBSD__)
+    rc->ip = uc->uc_mcontext.__gregs[_REG_PC];
+    rc->fp = uc->uc_mcontext.__gregs[_REG_FP];
+# elif defined(__OpenBSD__)
+    rc->ip = uc->sc_pc;
+    rc->fp = uc->sc_fpreg[29];
 # elif defined(__QNX__)
     rc->ip = uc->uc_mcontext.cpu.gpr[15];
     rc->fp = uc->uc_mcontext.cpu.gpr[11];
@@ -860,8 +869,9 @@ static int rt_get_caller_pc(addr_t *paddr, rt_context *rc, int level)
 #elif defined(__arm__)
 static int rt_get_caller_pc(addr_t *paddr, rt_context *rc, int level)
 {
-    /* XXX: only supports linux */
-#if !defined(__linux__)
+    /* XXX: only supports linux/bsd */
+#if !defined(__linux__) && \
+    !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
     return -1;
 #else
     if (level == 0) {

tests/tcctest.c

@@ -21,7 +21,9 @@
 typedef __SIZE_TYPE__ uintptr_t;
 #endif
 
-#if defined(_WIN32)
+#if defined(_WIN32) || \
+    (defined(__arm__) && \
+     (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)))
 #define LONG_LONG_FORMAT "%lld"
 #define ULONG_LONG_FORMAT "%llu"
 #else