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Commit 1944bf8e authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Catalin Marinas
Browse files

arm64: debug: Treat the BRPs/WRPs as unsigned 



IDAA64DFR0_EL1: BRPs and WRPs are unsigned values. Use
the appropriate helpers to extract those fields.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reported-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 4f0a606b

arch/arm64/include/asm/hw_breakpoint.h

+4 −2
Original line number Diff line number Diff line
@@ -138,16 +138,18 @@ extern struct pmu perf_ops_bp; 
/* Determine number of BRP registers available. */

static inline int get_num_brps(void)

{

	u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);

	return 1 +

		cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),

		cpuid_feature_extract_unsigned_field(dfr0,

						ID_AA64DFR0_BRPS_SHIFT);

}



/* Determine number of WRP registers available. */

static inline int get_num_wrps(void)

{

	u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);

	return 1 +

		cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),

		cpuid_feature_extract_unsigned_field(dfr0,

						ID_AA64DFR0_WRPS_SHIFT);

}