rt: Add armhf support

Author: Wallbraker

rt/battery.toml

@@ -16,9 +16,13 @@ isTheRT = true
 libraries = ["pthread", "dl", "rt"]
 
 # For Linux or OSX
-[cfg.'(osx || linux) && !aarch64']
+[cfg.'(osx || linux) && !armhf && !aarch64']
 asmFiles = ["src/vrt/gc/save_regs.asm", "src/vrt/os/eh.asm"]
 
+# ARMHF has its own special assembly.
+[cfg.armhf]
+sFiles = ["src/vrt/armhf.s"]
+
 # AArch has its own special assembly.
 [cfg.aarch64]
 sFiles = ["src/vrt/aarch64.s"]

rt/src/core/c/posix/fcntl.volt

@@ -191,7 +191,7 @@ version (Linux) {
         enum O_DSYNC        = 0x1000;   // octal   010000
         enum O_RSYNC        = O_SYNC;
 
-    } else version (ARM) {
+    } else version (ARMHF) {
 
         enum O_CREAT        = 0x40;     // octal     0100
         enum O_EXCL         = 0x80;     // octal     0200

rt/src/core/c/posix/spawn.volt

@@ -33,6 +33,11 @@ version (Linux) {
 		struct posix_spawn_file_actions { __data: void[80]; }
 		struct posix_spawnattr { __data: void[336]; }
 
+	} else version (ARMHF) {
+
+		struct posix_spawn_file_actions { __data: void[76]; }
+		struct posix_spawnattr { __data: void[336]; }
+
 	} else version (AArch64) {
 
 		struct posix_spawn_file_actions { __data: void[80]; }

rt/src/core/c/posix/sys/socket.volt

@@ -396,7 +396,7 @@ version (Linux) {
             SO_TYPE         = 3
         }
 
-    } else version (AArch64) {
+    } else version (ARMHF) {
 
         enum
         {
@@ -430,7 +430,7 @@ version (Linux) {
             SO_TYPE         = 3
         }
 
-    } else version (ARM) {
+    } else version (AArch64) {
 
         enum
         {

rt/src/core/c/posix/sys/stat.volt

@@ -159,6 +159,33 @@ version (Linux) {
 			__unused: slong_t[3];
 		}
 
+	} else version (ARMHF) {
+
+		struct stat_t
+		{
+			st_dev: dev_t;
+			__pad0: u16;
+			st_ino: ino_t;
+			st_mode: mode_t;
+			st_nlink: nlink_t;
+			st_uid: uid_t;
+			st_gid: gid_t;
+			st_rdev: dev_t;
+			__pad1: u32;
+			st_size: off_t;
+			st_blksize: blksize_t;
+			st_blocks: blkcnt_t;
+			//{
+				st_atime: time_t;
+				st_atimensec: c_ulong;
+				st_mtime: time_t;
+				st_mtimensec: c_ulong;
+				st_ctime: time_t;
+				st_ctimensec: c_ulong;
+			//}
+			__unused: i32[1];
+		}
+
 	} else version (AArch64) {
 
 		struct stat_t

rt/src/vrt/armhf.s

@@ -0,0 +1,43 @@
+	.arch armv7-a
+	.text
+	.fpu	vfpv3-d16
+
+#
+# fn vrt_eh_personality_v0(...)
+#
+# This function is needed to work around the compiler getting confused
+# about the prototype of vrt_eh_personality_v0, and acient fixed LLD bug.
+#
+	.p2align 2
+	.global	vrt_eh_personality_v0
+	.type	vrt_eh_personality_v0, %function
+	.code	32
+vrt_eh_personality_v0:
+	.fnstart
+	b vrt_eh_personality_v0_real
+.Lfunc_end0:
+	.size	vrt_eh_personality_v0, .Lfunc_end0-vrt_eh_personality_v0
+	.fnend
+
+
+#
+# fn __vrt_push_registers(cb: dg())
+#
+# Pushes all useful registers to the stack and calls the given delegate.
+#
+	.p2align 2
+	.globl	__vrt_push_registers
+	.type	__vrt_push_registers, %function
+	.code	32
+__vrt_push_registers:
+	.fnstart
+	.save	{r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
+	push	{r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
+	.setfp	r11, sp, #40
+	add	r11, sp, #40
+	blx	r1
+	sub	sp, r11, #40
+	pop	{r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, pc}
+.Lfunc_end1:
+	.size	__vrt_push_registers, .Lfunc_end1-__vrt_push_registers
+	.fnend

rt/src/vrt/os/eh/stub.volt

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: BSL-1.0
 module vrt.os.eh.stub;
 
-version (!Linux && !OSX && !MinGW && !Windows):
+version ((!Linux && !OSX && !MinGW && !Windows) || ARMHF):
 
 import core.exception: Throwable, Error, AssertError, KeyNotFoundException;
 import core.rt.misc: vrt_panic;

rt/src/vrt/os/eh/unwind.volt

@@ -3,7 +3,7 @@
 //! Exception handling using libunwind and DWARF.
 module vrt.os.eh.unwind;
 
-version (Linux || OSX || MinGW):
+version ((Linux || OSX || MinGW) && !ARMHF):
 
 import core.rt.misc: vrt_panic, vrt_handle_cast;
 import core.typeinfo: TypeInfo;
@@ -28,6 +28,11 @@ version (X86) {
 	enum vrt_eh_return_0 = 0;
 	enum vrt_eh_return_1 = 1;
 
+} else version (ARMHF) {
+
+	enum vrt_eh_return_0 = 0;
+	enum vrt_eh_return_1 = 1;
+
 } else version (AArch64) {
 
 	enum vrt_eh_return_0 = 0;