From: Candle Sun <[email protected]> When ARMv8.1/ARMv8.2 cores are used in AArch32 mode, arch_hw_breakpoint_init() in arch/arm/kernel/hw_breakpoint.c will be used.
>From ARMv8 specification, different debug architecture versions defined: * 0110 ARMv8, v8 Debug architecture. * 0111 ARMv8.1, v8 Debug architecture, with Virtualization Host Extensions. * 1000 ARMv8.2, v8.2 Debug architecture. So missing ARMv8.1/ARMv8.2 cases will cause enable_monitor_mode() function returns -ENODEV, and arch_hw_breakpoint_init() will fail. Signed-off-by: Candle Sun <[email protected]> Signed-off-by: Nianfu Bai <[email protected]> --- arch/arm/include/asm/hw_breakpoint.h | 2 ++ arch/arm/kernel/hw_breakpoint.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/arm/include/asm/hw_breakpoint.h b/arch/arm/include/asm/hw_breakpoint.h index ac54c06..9137ef6 100644 --- a/arch/arm/include/asm/hw_breakpoint.h +++ b/arch/arm/include/asm/hw_breakpoint.h @@ -53,6 +53,8 @@ static inline void decode_ctrl_reg(u32 reg, #define ARM_DEBUG_ARCH_V7_MM 4 #define ARM_DEBUG_ARCH_V7_1 5 #define ARM_DEBUG_ARCH_V8 6 +#define ARM_DEBUG_ARCH_V8_1 7 +#define ARM_DEBUG_ARCH_V8_2 8 /* Breakpoint */ #define ARM_BREAKPOINT_EXECUTE 0 diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c index b0c195e..cb99612 100644 --- a/arch/arm/kernel/hw_breakpoint.c +++ b/arch/arm/kernel/hw_breakpoint.c @@ -246,6 +246,8 @@ static int enable_monitor_mode(void) case ARM_DEBUG_ARCH_V7_ECP14: case ARM_DEBUG_ARCH_V7_1: case ARM_DEBUG_ARCH_V8: + case ARM_DEBUG_ARCH_V8_1: + case ARM_DEBUG_ARCH_V8_2: ARM_DBG_WRITE(c0, c2, 2, (dscr | ARM_DSCR_MDBGEN)); isb(); break; -- 2.7.4
