Cortex-M3: Add base support for Cortex-M3

This patch adds the base support for the Cortex-M3 processor (ARMv7-M
architecture). It consists of the corresponding arch/arm/mm/ files and
various #ifdef's around the kernel. Exception handling is implemented by
a subsequent patch.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 37 insertions, 1 deletions

diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index bbecccda76d0..1f7419c9fcc0 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -37,16 +37,25 @@
 #define FIQ26_MODE	0x00000001
 #define IRQ26_MODE	0x00000002
 #define SVC26_MODE	0x00000003
+#ifndef CONFIG_CPU_V7M
 #define USR_MODE	0x00000010
+#define SVC_MODE	0x00000013
+#else
+#define USR_MODE	0x00000000
+#define SVC_MODE	0x00000000
+#endif
 #define FIQ_MODE	0x00000011
 #define IRQ_MODE	0x00000012
-#define SVC_MODE	0x00000013
 #define ABT_MODE	0x00000017
 #define UND_MODE	0x0000001b
 #define SYSTEM_MODE	0x0000001f
 #define MODE32_BIT	0x00000010
 #define MODE_MASK	0x0000001f
+#ifndef CONFIG_CPU_V7M
 #define PSR_T_BIT	0x00000020
+#else
+#define PSR_T_BIT	0x01000000
+#endif
 #define PSR_F_BIT	0x00000040
 #define PSR_I_BIT	0x00000080
 #define PSR_A_BIT	0x00000100
@@ -101,6 +110,28 @@ struct pt_regs {
 	long uregs[18];
 };
 
+#ifdef CONFIG_CPU_V7M
+/* Automatically saved registers */
+#define ARM_cpsr	uregs[17]
+#define ARM_pc		uregs[16]
+#define ARM_lr		uregs[15]
+#define ARM_ip		uregs[14]
+#define ARM_r3		uregs[13]
+#define ARM_r2		uregs[12]
+#define ARM_r1		uregs[11]
+#define ARM_r0		uregs[10]
+/* saved by the exception entry code */
+#define ARM_EXC_lr	uregs[9]
+#define ARM_sp		uregs[8]
+#define ARM_fp		uregs[7]
+#define ARM_r10		uregs[6]
+#define ARM_r9		uregs[5]
+#define ARM_r8		uregs[4]
+#define ARM_r7		uregs[3]
+#define ARM_r6		uregs[2]
+#define ARM_r5		uregs[1]
+#define ARM_r4		uregs[0]
+#else
 #define ARM_cpsr	uregs[16]
 #define ARM_pc		uregs[15]
 #define ARM_lr		uregs[14]
@@ -119,6 +150,7 @@ struct pt_regs {
 #define ARM_r1		uregs[1]
 #define ARM_r0		uregs[0]
 #define ARM_ORIG_r0	uregs[17]
+#endif
 
 #ifdef __KERNEL__
 
@@ -150,6 +182,7 @@ struct pt_regs {
  */
 static inline int valid_user_regs(struct pt_regs *regs)
 {
+#ifndef CONFIG_CPU_V7M
 	if (user_mode(regs) && (regs->ARM_cpsr & PSR_I_BIT) == 0) {
 		regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
 		return 1;
@@ -163,6 +196,9 @@ static inline int valid_user_regs(struct pt_regs *regs)
 		regs->ARM_cpsr |= USR_MODE;
 
 	return 0;
+#else
+	return 1;
+#endif
 }
 
 #define instruction_pointer(regs)	(regs)->ARM_pc