We're going to need PSR bit defines and pt_regs. We'll also need pt_regs offsets in assembly code. This patch adapts the linux kernel's ptrace.h and asm-offsets to this framework. Even though lib/arm/asm-offsets.h is a generated file, we still commit it, as it's unlikely to change. Also adapt cp15.h from the kernel, since we'll need bit defines from there too. Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx> --- config/config-arm.mak | 17 ++++++-- lib/arm/asm-offsets.h | 27 +++++++++++++ lib/arm/cp15.h | 36 +++++++++++++++++ lib/arm/ptrace.h | 100 ++++++++++++++++++++++++++++++++++++++++++++++ scripts/arm/asm-offsets.c | 40 +++++++++++++++++++ 5 files changed, 216 insertions(+), 4 deletions(-) create mode 100644 lib/arm/asm-offsets.h create mode 100644 lib/arm/cp15.h create mode 100644 lib/arm/ptrace.h create mode 100644 scripts/arm/asm-offsets.c diff --git a/config/config-arm.mak b/config/config-arm.mak index d0814186b279c..173e606fbe64c 100644 --- a/config/config-arm.mak +++ b/config/config-arm.mak @@ -1,3 +1,4 @@ +PROCESSOR = cortex-a15 mach = mach-virt iodevs = pl011 virtio_mmio phys_base = 0x40000000 @@ -30,8 +31,7 @@ $(libcflat) $(libeabi): CFLAGS += -ffreestanding -I lib CFLAGS += -Wextra CFLAGS += -marm -#CFLAGS += -mcpu=$(PROCESSOR) -CFLAGS += -mcpu=cortex-a15 +CFLAGS += -mcpu=$(PROCESSOR) CFLAGS += -O2 libgcc := $(shell $(CC) -m$(ARCH) --print-libgcc-file-name) @@ -55,7 +55,7 @@ tests_and_config = $(TEST_DIR)/*.flat $(TEST_DIR)/unittests.cfg test_cases: $(tests-common) $(tests) -$(TEST_DIR)/%.o: CFLAGS += -std=gnu99 -ffreestanding -I lib +$(TEST_DIR)/%.o scripts/arm/%.o: CFLAGS += -std=gnu99 -ffreestanding -I lib $(TEST_DIR)/boot.elf: $(cstart.o) $(TEST_DIR)/boot.o @@ -67,7 +67,16 @@ lib/$(TEST_DIR)/mach-virt.dts: $(QEMU_BIN) -kernel /dev/null -M virt -machine dumpdtb=$(dtb) fdtdump $(dtb) > $@ +.PHONY: asm-offsets + +asm-offsets: scripts/arm/asm-offsets.flat + $(QEMU_BIN) -device virtio-testdev -display none -serial stdio \ + -M virt -cpu $(PROCESSOR) \ + -kernel $^ > lib/arm/asm-offsets.h || true +scripts/arm/asm-offsets.elf: $(cstart.o) scripts/arm/asm-offsets.o + arch_clean: $(RM) $(TEST_DIR)/*.o $(TEST_DIR)/*.flat $(TEST_DIR)/*.elf \ $(libeabi) $(eabiobjs) $(TEST_DIR)/.*.d lib/arm/.*.d \ - lib/$(TEST_DIR)/iomaps.gen.c lib/$(TEST_DIR)/mach-virt.* + lib/$(TEST_DIR)/iomaps.gen.c lib/$(TEST_DIR)/mach-virt.* \ + scripts/arm/.*.d scripts/arm/*.o scripts/arm/*.flat scripts/arm/*.elf diff --git a/lib/arm/asm-offsets.h b/lib/arm/asm-offsets.h new file mode 100644 index 0000000000000..b43be20ef8377 --- /dev/null +++ b/lib/arm/asm-offsets.h @@ -0,0 +1,27 @@ +#ifndef _ARM_ASM_OFFSETS_H_ +#define _ARM_ASM_OFFSETS_H_ +/* + * Generated file. Regenerate with 'make asm-offsets' + */ + +#define S_R0 0x0 +#define S_R1 0x4 +#define S_R2 0x8 +#define S_R3 0xc +#define S_R4 0x10 +#define S_R5 0x14 +#define S_R6 0x18 +#define S_R7 0x1c +#define S_R8 0x20 +#define S_R9 0x24 +#define S_R10 0x28 +#define S_FP 0x2c +#define S_IP 0x30 +#define S_SP 0x34 +#define S_LR 0x38 +#define S_PC 0x3c +#define S_PSR 0x40 +#define S_OLD_R0 0x44 +#define S_FRAME_SIZE 0x48 + +#endif /* _ARM_ASM_OFFSETS_H_ */ diff --git a/lib/arm/cp15.h b/lib/arm/cp15.h new file mode 100644 index 0000000000000..6a8a29aadb008 --- /dev/null +++ b/lib/arm/cp15.h @@ -0,0 +1,36 @@ +#ifndef _ARM_CP15_H_ +#define _ARM_CP15_H_ +/* + * From Linux kernel arch/arm/include/asm/cp15.h + * + * CR1 bits (CP#15 CR1) + */ +#define CR_M (1 << 0) /* MMU enable */ +#define CR_A (1 << 1) /* Alignment abort enable */ +#define CR_C (1 << 2) /* Dcache enable */ +#define CR_W (1 << 3) /* Write buffer enable */ +#define CR_P (1 << 4) /* 32-bit exception handler */ +#define CR_D (1 << 5) /* 32-bit data address range */ +#define CR_L (1 << 6) /* Implementation defined */ +#define CR_B (1 << 7) /* Big endian */ +#define CR_S (1 << 8) /* System MMU protection */ +#define CR_R (1 << 9) /* ROM MMU protection */ +#define CR_F (1 << 10) /* Implementation defined */ +#define CR_Z (1 << 11) /* Implementation defined */ +#define CR_I (1 << 12) /* Icache enable */ +#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */ +#define CR_RR (1 << 14) /* Round Robin cache replacement */ +#define CR_L4 (1 << 15) /* LDR pc can set T bit */ +#define CR_DT (1 << 16) +#define CR_HA (1 << 17) /* Hardware management of Access Flag */ +#define CR_IT (1 << 18) +#define CR_ST (1 << 19) +#define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */ +#define CR_U (1 << 22) /* Unaligned access operation */ +#define CR_XP (1 << 23) /* Extended page tables */ +#define CR_VE (1 << 24) /* Vectored interrupts */ +#define CR_EE (1 << 25) /* Exception (Big) Endian */ +#define CR_TRE (1 << 28) /* TEX remap enable */ +#define CR_AFE (1 << 29) /* Access flag enable */ +#define CR_TE (1 << 30) /* Thumb exception enable */ +#endif diff --git a/lib/arm/ptrace.h b/lib/arm/ptrace.h new file mode 100644 index 0000000000000..3c8781508a72e --- /dev/null +++ b/lib/arm/ptrace.h @@ -0,0 +1,100 @@ +#ifndef _ARM_PTRACE_H_ +#define _ARM_PTRACE_H_ +/* + * Adapted from Linux kernel headers + * arch/arm/include/asm/ptrace.h + * arch/arm/include/uapi/asm/ptrace.h + */ + +/* + * PSR bits + */ +#define USR_MODE 0x00000010 +#define SVC_MODE 0x00000013 +#define FIQ_MODE 0x00000011 +#define IRQ_MODE 0x00000012 +#define ABT_MODE 0x00000017 +#define HYP_MODE 0x0000001a +#define UND_MODE 0x0000001b +#define SYSTEM_MODE 0x0000001f +#define MODE32_BIT 0x00000010 +#define MODE_MASK 0x0000001f + +#define PSR_T_BIT 0x00000020 /* >= V4T, but not V7M */ +#define PSR_F_BIT 0x00000040 /* >= V4, but not V7M */ +#define PSR_I_BIT 0x00000080 /* >= V4, but not V7M */ +#define PSR_A_BIT 0x00000100 /* >= V6, but not V7M */ +#define PSR_E_BIT 0x00000200 /* >= V6, but not V7M */ +#define PSR_J_BIT 0x01000000 /* >= V5J, but not V7M */ +#define PSR_Q_BIT 0x08000000 /* >= V5E, including V7M */ +#define PSR_V_BIT 0x10000000 +#define PSR_C_BIT 0x20000000 +#define PSR_Z_BIT 0x40000000 +#define PSR_N_BIT 0x80000000 + +/* + * Groups of PSR bits + */ +#define PSR_f 0xff000000 /* Flags */ +#define PSR_s 0x00ff0000 /* Status */ +#define PSR_x 0x0000ff00 /* Extension */ +#define PSR_c 0x000000ff /* Control */ + +/* + * ARMv7 groups of PSR bits + */ +#define APSR_MASK 0xf80f0000 /* N, Z, C, V, Q and GE flags */ +#define PSR_ISET_MASK 0x01000010 /* ISA state (J, T) mask */ +#define PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */ +#define PSR_ENDIAN_MASK 0x00000200 /* Endianness state mask */ + +#ifndef __ASSEMBLY__ +#include "libcflat.h" + +struct pt_regs { + unsigned long uregs[18]; +}; + +#define ARM_cpsr uregs[16] +#define ARM_pc uregs[15] +#define ARM_lr uregs[14] +#define ARM_sp uregs[13] +#define ARM_ip uregs[12] +#define ARM_fp uregs[11] +#define ARM_r10 uregs[10] +#define ARM_r9 uregs[9] +#define ARM_r8 uregs[8] +#define ARM_r7 uregs[7] +#define ARM_r6 uregs[6] +#define ARM_r5 uregs[5] +#define ARM_r4 uregs[4] +#define ARM_r3 uregs[3] +#define ARM_r2 uregs[2] +#define ARM_r1 uregs[1] +#define ARM_r0 uregs[0] +#define ARM_ORIG_r0 uregs[17] + +#define user_mode(regs) \ + (((regs)->ARM_cpsr & 0xf) == 0) + +#define processor_mode(regs) \ + ((regs)->ARM_cpsr & MODE_MASK) + +#define interrupts_enabled(regs) \ + (!((regs)->ARM_cpsr & PSR_I_BIT)) + +#define fast_interrupts_enabled(regs) \ + (!((regs)->ARM_cpsr & PSR_F_BIT)) + +#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0)) + +static inline unsigned long regs_get_register(struct pt_regs *regs, + unsigned int offset) +{ + if (offset > MAX_REG_OFFSET) + return 0; + return *(unsigned long *)((unsigned long)regs + offset); +} + +#endif /* __ASSEMBLY__ */ +#endif /* _ARM_PTRACE_H_ */ diff --git a/scripts/arm/asm-offsets.c b/scripts/arm/asm-offsets.c new file mode 100644 index 0000000000000..03b22da907d58 --- /dev/null +++ b/scripts/arm/asm-offsets.c @@ -0,0 +1,40 @@ +/* + * Adapted from arch/arm/kernel/asm-offsets.c + */ +#include "libcflat.h" +#include "arm/ptrace.h" + +#define P(sym, val) \ + printf("#define " #sym "\t0x%x\n", val) + +int main(void) +{ + printf("#ifndef _ARM_ASM_OFFSETS_H_\n"); + printf("#define _ARM_ASM_OFFSETS_H_\n"); + printf("/*\n"); + printf(" * Generated file. Regenerate with 'make asm-offsets'\n"); + printf(" */\n"); + printf("\n"); + P(S_R0, offsetof(struct pt_regs, ARM_r0)); + P(S_R1, offsetof(struct pt_regs, ARM_r1)); + P(S_R2, offsetof(struct pt_regs, ARM_r2)); + P(S_R3, offsetof(struct pt_regs, ARM_r3)); + P(S_R4, offsetof(struct pt_regs, ARM_r4)); + P(S_R5, offsetof(struct pt_regs, ARM_r5)); + P(S_R6, offsetof(struct pt_regs, ARM_r6)); + P(S_R7, offsetof(struct pt_regs, ARM_r7)); + P(S_R8, offsetof(struct pt_regs, ARM_r8)); + P(S_R9, offsetof(struct pt_regs, ARM_r9)); + P(S_R10, offsetof(struct pt_regs, ARM_r10)); + P(S_FP, offsetof(struct pt_regs, ARM_fp)); + P(S_IP, offsetof(struct pt_regs, ARM_ip)); + P(S_SP, offsetof(struct pt_regs, ARM_sp)); + P(S_LR, offsetof(struct pt_regs, ARM_lr)); + P(S_PC, offsetof(struct pt_regs, ARM_pc)); + P(S_PSR, offsetof(struct pt_regs, ARM_cpsr)); + P(S_OLD_R0, offsetof(struct pt_regs, ARM_ORIG_r0)); + P(S_FRAME_SIZE, sizeof(struct pt_regs)); + printf("\n"); + printf("#endif /* _ARM_ASM_OFFSETS_H_ */\n"); + return 0; +} -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html