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.S

@@ -0,0 +1,41 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * tls access function
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Hubert Badocha
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+ /* NOTE:
+ * 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. */
+
+
+/* typedef struct {
+ *   unsigned long ti_moduleid;
+ *   unsigned long ti_tlsoffset;
+ * } TLS_index;
+ *
+ * void *__tls_get_addr(TLS_index *ti) */
+.globl __tls_get_addr;
+.type __tls_get_addr, %function;
+__tls_get_addr:
+	/* Access ti_tlsoffset. */
+    ldr r0, [r0, #4]
+	/* Get thread pointer. */
+	mrc p15, #0, r1, cr13, cr0, #3
+	/* GCC expects that TLS block has 8 byte TCB pointer at the begging. */
+	add r1, r1, #8
+	add r0, r0, r1
+	bx  lr
+.size __tls_get_addr, .-__tls_get_addr

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.S

@@ -0,0 +1,39 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * tls access function
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Hubert Badocha
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+/* NOTE:
+ * 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. */
+
+
+/* typedef struct {
+ *   unsigned long ti_moduleid;
+ *   unsigned long ti_tlsoffset;
+ * } TLS_index;
+ *
+ * void *__tls_get_addr(TLS_index *ti) */
+.globl __tls_get_addr;
+.type __tls_get_addr, %function;
+__tls_get_addr:
+	/* Access ti_tlsoffset. */
+    ld   a0, 8(a0)
+	/* GCC expects that Dynamic Thread Vector pointer points at TLS block start + 0x800  */
+	li   t0, 0x800
+    add  a0, a0, t0
+	add  a0, a0, tp
+	ret
+.size __tls_get_addr, .-__tls_get_addr