Date: Wed, 30 Oct 2019 13:45:40 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r354178 - in head/sys/arm64: arm64 include Message-ID: <201910301345.x9UDjei2032524@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: andrew Date: Wed Oct 30 13:45:40 2019 New Revision: 354178 URL: https://svnweb.freebsd.org/changeset/base/354178 Log: Allow the userspace ID register fields to be read from the kernel To allow consistent values to be used in both the kernel and userspace create a function for these to be read from the kernel. They use a newly created macro with the name of the ID register to read. For now there is redundant information in the user_regs array as it still holds the CRm and Op2 values, however this will be fixed in a later change. This will be used by ptrace to allow hardware breakpoints in userspace. Sponsored by: DARPA, AFRL Modified: head/sys/arm64/arm64/identcpu.c head/sys/arm64/include/armreg.h head/sys/arm64/include/undefined.h Modified: head/sys/arm64/arm64/identcpu.c ============================================================================== --- head/sys/arm64/arm64/identcpu.c Wed Oct 30 12:47:00 2019 (r354177) +++ head/sys/arm64/arm64/identcpu.c Wed Oct 30 13:45:40 2019 (r354178) @@ -710,6 +710,7 @@ static struct mrs_field id_aa64pfr1_fields[] = { }; struct mrs_user_reg { + u_int reg; u_int CRm; u_int Op2; size_t offset; @@ -718,24 +719,28 @@ struct mrs_user_reg { static struct mrs_user_reg user_regs[] = { { /* id_aa64isar0_el1 */ + .reg = ID_AA64ISAR0_EL1, .CRm = 6, .Op2 = 0, .offset = __offsetof(struct cpu_desc, id_aa64isar0), .fields = id_aa64isar0_fields, }, { /* id_aa64isar1_el1 */ + .reg = ID_AA64ISAR1_EL1, .CRm = 6, .Op2 = 1, .offset = __offsetof(struct cpu_desc, id_aa64isar1), .fields = id_aa64isar1_fields, }, { /* id_aa64pfr0_el1 */ + .reg = ID_AA64PFR0_EL1, .CRm = 4, .Op2 = 0, .offset = __offsetof(struct cpu_desc, id_aa64pfr0), .fields = id_aa64pfr0_fields, }, { /* id_aa64dfr0_el1 */ + .reg = ID_AA64DFR0_EL1, .CRm = 5, .Op2 = 0, .offset = __offsetof(struct cpu_desc, id_aa64dfr0), @@ -816,6 +821,23 @@ user_mrs_handler(vm_offset_t va, uint32_t insn, struct frame->tf_lr = value; return (1); +} + +bool +extract_user_id_field(u_int reg, u_int field_shift, uint8_t *val) +{ + uint64_t value; + int i; + + for (i = 0; i < nitems(user_regs); i++) { + if (user_regs[i].reg == reg) { + value = CPU_DESC_FIELD(user_cpu_desc, i); + *val = value >> field_shift; + return (true); + } + } + + return (false); } static void Modified: head/sys/arm64/include/armreg.h ============================================================================== --- head/sys/arm64/include/armreg.h Wed Oct 30 12:47:00 2019 (r354177) +++ head/sys/arm64/include/armreg.h Wed Oct 30 13:45:40 2019 (r354178) @@ -51,6 +51,10 @@ #define MRS_Op2_MASK 0x000000e0 #define MRS_Rt_SHIFT 0 #define MRS_Rt_MASK 0x0000001f +#define MRS_REG(op0, op1, crn, crm, op2) \ + (((op0) << MRS_Op0_SHIFT) | ((op1) << MRS_Op1_SHIFT) | \ + ((crn) << MRS_CRn_SHIFT) | ((crm) << MRS_CRm_SHIFT) | \ + ((op2) << MRS_Op2_SHIFT)) #define READ_SPECIALREG(reg) \ ({ uint64_t _val; \ @@ -193,6 +197,7 @@ #define ICC_SRE_EL2_EN (1U << 3) /* ID_AA64DFR0_EL1 */ +#define ID_AA64DFR0_EL1 MRS_REG(3, 0, 0, 5, 0) #define ID_AA64DFR0_DebugVer_SHIFT 0 #define ID_AA64DFR0_DebugVer_MASK (UL(0xf) << ID_AA64DFR0_DebugVer_SHIFT) #define ID_AA64DFR0_DebugVer_VAL(x) ((x) & ID_AA64DFR0_DebugVer_MASK) @@ -230,6 +235,7 @@ #define ID_AA64DFR0_PMSVer_V1 (UL(0x1) << ID_AA64DFR0_PMSVer_SHIFT) /* ID_AA64ISAR0_EL1 */ +#define ID_AA64ISAR0_EL1 MRS_REG(3, 0, 0, 6, 0) #define ID_AA64ISAR0_AES_SHIFT 4 #define ID_AA64ISAR0_AES_MASK (UL(0xf) << ID_AA64ISAR0_AES_SHIFT) #define ID_AA64ISAR0_AES_VAL(x) ((x) & ID_AA64ISAR0_AES_MASK) @@ -284,6 +290,7 @@ #define ID_AA64ISAR0_DP_IMPL (UL(0x1) << ID_AA64ISAR0_DP_SHIFT) /* ID_AA64ISAR1_EL1 */ +#define ID_AA64ISAR1_EL1 MRS_REG(3, 0, 0, 6, 1) #define ID_AA64ISAR1_DPB_SHIFT 0 #define ID_AA64ISAR1_DPB_MASK (UL(0xf) << ID_AA64ISAR1_DPB_SHIFT) #define ID_AA64ISAR1_DPB_VAL(x) ((x) & ID_AA64ISAR1_DPB_MASK) @@ -326,6 +333,7 @@ #define ID_AA64ISAR1_GPI_IMPL (UL(0x1) << ID_AA64ISAR1_GPI_SHIFT) /* ID_AA64MMFR0_EL1 */ +#define ID_AA64MMFR0_EL1 MRS_REG(3, 0, 0, 7, 0) #define ID_AA64MMFR0_PARange_SHIFT 0 #define ID_AA64MMFR0_PARange_MASK (UL(0xf) << ID_AA64MMFR0_PARange_SHIFT) #define ID_AA64MMFR0_PARange_VAL(x) ((x) & ID_AA64MMFR0_PARange_MASK) @@ -373,6 +381,7 @@ #define ID_AA64MMFR0_TGran4_NONE (UL(0xf) << ID_AA64MMFR0_TGran4_SHIFT) /* ID_AA64MMFR1_EL1 */ +#define ID_AA64MMFR1_EL1 MRS_REG(3, 0, 0, 7, 1) #define ID_AA64MMFR1_HAFDBS_SHIFT 0 #define ID_AA64MMFR1_HAFDBS_MASK (UL(0xf) << ID_AA64MMFR1_HAFDBS_SHIFT) #define ID_AA64MMFR1_HAFDBS_VAL(x) ((x) & ID_AA64MMFR1_HAFDBS_MASK) @@ -418,7 +427,7 @@ #define ID_AA64MMFR1_XNX_IMPL (UL(0x1) << ID_AA64MMFR1_XNX_SHIFT) /* ID_AA64MMFR2_EL1 */ -#define ID_AA64MMFR2_EL1 S3_0_C0_C7_2 +#define ID_AA64MMFR2_EL1 MRS_REG(3, 0, 0, 7, 2) #define ID_AA64MMFR2_CnP_SHIFT 0 #define ID_AA64MMFR2_CnP_MASK (UL(0xf) << ID_AA64MMFR2_CnP_SHIFT) #define ID_AA64MMFR2_CnP_VAL(x) ((x) & ID_AA64MMFR2_CnP_MASK) @@ -456,6 +465,7 @@ #define ID_AA64MMFR2_NV_IMPL (UL(0x1) << ID_AA64MMFR2_NV_SHIFT) /* ID_AA64PFR0_EL1 */ +#define ID_AA64PFR0_EL1 MRS_REG(3, 0, 0, 4, 0) #define ID_AA64PFR0_EL0_SHIFT 0 #define ID_AA64PFR0_EL0_MASK (UL(0xf) << ID_AA64PFR0_EL0_SHIFT) #define ID_AA64PFR0_EL0_VAL(x) ((x) & ID_AA64PFR0_EL0_MASK) Modified: head/sys/arm64/include/undefined.h ============================================================================== --- head/sys/arm64/include/undefined.h Wed Oct 30 12:47:00 2019 (r354177) +++ head/sys/arm64/include/undefined.h Wed Oct 30 13:45:40 2019 (r354178) @@ -33,6 +33,8 @@ #ifndef _MACHINE__UNDEFINED_H_ #define _MACHINE__UNDEFINED_H_ +#ifdef _KERNEL + typedef int (*undef_handler_t)(vm_offset_t, uint32_t, struct trapframe *, uint32_t); @@ -60,5 +62,8 @@ void undef_init(void); void *install_undef_handler(bool, undef_handler_t); void remove_undef_handler(void *); int undef_insn(u_int, struct trapframe *); +bool extract_user_id_field(u_int, u_int, uint8_t *); + +#endif /* _KERNEL */ #endif
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201910301345.x9UDjei2032524>