libphoenix: compile with FPIC by default

JIRA: RTOS-664

Makefile

@@ -25,6 +25,9 @@ endif
 
 CFLAGS += -Iinclude -fno-builtin-malloc
 
+ifneq ($(LIBPHOENIX_NOPIC), y)
+CFLAGS += -fpic
+endif
 
 OBJS :=
 # crt0.o should have all necessary initialization + call to main()

arch/armv7a/Makefile

@@ -5,5 +5,5 @@
 # Author: Pawel Pisarczyk
 #
 
-OBJS += $(addprefix $(PREFIX_O)arch/armv7a/, syscalls.o jmp.o signal.o string.o reboot.o)
+OBJS += $(addprefix $(PREFIX_O)arch/armv7a/, syscalls.o jmp.o signal.o string.o reboot.o tls.o)
 CRT0_OBJS += $(addprefix $(PREFIX_O)arch/armv7a/, _start.o)

arch/armv7a/tls.c

@@ -0,0 +1,36 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * tls access function
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Hubert Badocha
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+#define TLS_TCB_SIZE 8
+
+
+typedef struct {
+	unsigned long ti_moduleid;
+	unsigned long ti_tlsoffset;
+} TLS_index;
+
+
+/* When libphoenix is compiled as a PIC, even when linked into a static NOPIC binary,
+ * compiler generates accesses to TLS as calls to this function.
+ * This functions is simple version just for static binaries purposes,
+ * in dynamic binaries dynamic linker handles TLS accesses. */
+void *__tls_get_addr(TLS_index *ti)
+{
+	void *ptr;
+	__asm__ volatile ("mrc p15, 0, %0, cr13, cr0, 3"
+					  : "=r"(ptr));
+	return ((char *)ptr) + TLS_TCB_SIZE + ti->ti_tlsoffset;
+}

arch/riscv64/Makefile

@@ -5,5 +5,5 @@
 # Author: Pawel Pisarczyk
 #
 
-OBJS += $(addprefix $(PREFIX_O)arch/riscv64/, syscalls.o string.o signal.o reboot.o jmp.o)
+OBJS += $(addprefix $(PREFIX_O)arch/riscv64/, syscalls.o string.o signal.o reboot.o jmp.o tls.o)
 CRT0_OBJS += $(addprefix $(PREFIX_O)arch/riscv64/, _start.o)

arch/riscv64/tls.c

@@ -0,0 +1,34 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * tls access function
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Hubert Badocha
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+typedef struct {
+	unsigned long ti_moduleid;
+	unsigned long ti_tlsoffset;
+} TLS_index;
+
+
+/* When libphoenix is compiled as a PIC, even when linked into a static NOPIC binary,
+ * compiler generates accesses to TLS as calls to this function.
+ * This functions is simple version just for static binaries purposes,
+ * in dynamic binaries dynamic linker handles TLS accesses. */
+void *__tls_get_addr(TLS_index *ti)
+{
+	void *ptr;
+	__asm__ volatile ("mv %0, tp"
+					  : "=r"(ptr));
+	/* GCC expects that Dynamic Thread Vector pointer points at TLS block start + 0x800  */
+	return ((char *)ptr) + ti->ti_tlsoffset + 0x800;
+}