arch: add armv8m

arch/armv8m/Makefile

@@ -0,0 +1,9 @@
+#
+# Makefile for libphoenix/arch/armv8
+#
+# Copyright 2024 Phoenix Systems
+# Author: Damian Loewnau
+#
+
+OBJS += $(addprefix $(PREFIX_O)arch/armv8m/, syscalls.o jmp.o signal.o string.o reboot.o tls.o)
+CRT0_OBJS += $(addprefix $(PREFIX_O)arch/armv8m/, crt0.o)

arch/armv8m/crt0.S

@@ -0,0 +1,27 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * Entrypoint (armv8m)
+ *
+ * Copyright 2018, 2023, 2024 Phoenix Systems
+ * Author: Aleksander Kaminski, Hubert Badocha, Damian Loewnau
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#define __ASSEMBLY__
+
+.text
+.thumb
+.syntax unified
+
+.globl _start
+.type _start, %function
+_start:
+	pop {r0-r3}
+	b   _startc
+.size _start, .-_start

arch/armv8m/jmp.S

@@ -0,0 +1,121 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ *
+ * _setjmp, _longjmp, setjmp, sigsetjmp
+ *
+ * Copyright 2018, 2019, 2024 Phoenix Systems
+ * Author: Kamil Amanowicz, Aleksander Kaminski, Jakub Sarzyński, Damian Loewnau
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+ /* setjmp env buffer description
+  * Offset  Description
+  * 0       Signal mask flag - if != 0 then next value stores a signal mask
+  * 4       Signal mask
+  * 8       SP register
+  * 12-43   r4-r11 registers
+  * 44      LR register
+  * 48-79   d8-d15 registers
+  * 80      fpscr register
+  */
+
+#define __ASSEMBLY__
+
+.thumb
+.syntax unified
+
+.text
+.align 2
+
+
+.globl sigsetjmp
+.type sigsetjmp, %function
+.align 2
+sigsetjmp:
+	/* Store signal mask if savesigs != 0 */
+	movs r2, #0
+	cbz r1, 1f
+
+	/* Get signal mask */
+	/* Stack must be aligned to 8 bytes */
+	push {r0, r1, r3, lr}
+	movs r0, #0
+	mov r1, r0
+	bl signalMask
+	mov r2, r0
+	pop {r0, r1, r3, lr}
+
+1:
+	/* Store mask (fake or real) and general registers */
+	mov r3, sp
+	stmia r0!, {r1-r11, lr}
+
+#ifndef __SOFTFP__
+	/* Store fpu registers */
+	vstm r0!, {d8-d15}
+	vmrs r2, fpscr
+	str r2, [r0], #4
+#endif
+
+	movs r0, #0
+	bx lr
+.size sigsetjmp, .-sigsetjmp
+
+
+.globl _setjmp
+.type _setjmp, %function
+.align 2
+_setjmp:
+	movs r1, #0
+	b sigsetjmp
+.size _setjmp, .-_setjmp
+
+
+.globl setjmp
+.type setjmp, %function
+.align 2
+setjmp:
+	movs r1, #1
+	b sigsetjmp
+.size setjmp, .-setjmp
+
+
+.globl _longjmp
+.type _longjmp, %function
+.align 2
+_longjmp:
+	/* Check for signal mask in env buffer, if it's saved restore it */
+	ldmia r0!, {r2-r3}
+	cbz r2, 1f
+
+	/* Restore mask */
+	push {r0, r1}
+	mov r0, r3
+	mvn r1, #0
+	bl signalMask
+	pop {r0, r1}
+
+1:
+	/* Restore general registers */
+	ldmia r0!, {r2, r4-r11, lr}
+	mov sp, r2
+
+#ifndef __SOFTFP__
+	/* Restore fpu registers */
+	vldm r0!, {d8-d15}
+	ldr r2, [r0], #4
+	vmsr fpscr, r2
+#endif
+
+	/* Set return value */
+	movs r0, r1
+	it eq
+	moveq r0, #1
+	bx lr
+.size _longjmp, .-_longjmp

arch/armv8m/reboot.c

@@ -0,0 +1,51 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * reboot.c
+ *
+ * Copyright 2019, 2024 Phoenix Systems
+ * Author: Jan Sikorski, Damian Loewnau
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#include <sys/reboot.h>
+#include <sys/platform.h>
+
+#if defined(__CPU_NRF9160)
+#include <phoenix/arch/armv8m/nrf/91/nrf9160.h>
+#endif
+
+
+int reboot(int magic)
+{
+	platformctl_t pctl = {
+		.action = pctl_set,
+		.type = pctl_reboot,
+		.reboot = {
+			.magic = magic }
+	};
+
+	return platformctl(&pctl);
+}
+
+
+int reboot_reason(uint32_t *val)
+{
+	platformctl_t pctl = {
+		.action = pctl_get,
+		.type = pctl_reboot,
+	};
+
+	*val = 0;
+	if (platformctl(&pctl) < 0) {
+		return -1;
+	}
+
+	*val = pctl.reboot.reason;
+	return 0;
+}

arch/armv8m/signal.S

@@ -0,0 +1,31 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * Signal trampoline (armv8)
+ *
+ * Copyright 2019, 2024 Phoenix Systems
+ * Author: Jan Sikorski, Damian Loewnau
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#define __ASSEMBLY__
+
+.text
+.globl _signal_trampoline
+.type _signal_trampoline, %function
+_signal_trampoline:
+	/* Signal number, cpu_context * */
+	pop {r0,r4}
+	blx _signal_handler
+
+	/* Old signal mask in r0 */
+	mov r1, r4
+	pop {r2,r3} /* pc, sp */
+	/* psr on stack */
+	bl sigreturn
+.size _signal_trampoline, .-_signal_trampoline