diff --git a/gcc/config/aarch64/aarch64-sys-regs.def b/gcc/config/aarch64/aarch64-sys-regs.def
index fffc35f72c8..6a948171d6e 100644
--- a/gcc/config/aarch64/aarch64-sys-regs.def
+++ b/gcc/config/aarch64/aarch64-sys-regs.def
@@ -54,6 +54,10 @@
   SYSREG ("amair_el12",		CPENC (3,5,10,3,0),	F_ARCHEXT,		AARCH64_FEATURE (V8_1A))
   SYSREG ("amair_el2",		CPENC (3,4,10,3,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("amair_el3",		CPENC (3,6,10,3,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("amair2_el1",		CPENC (3,0,10,3,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("amair2_el12",	CPENC (3,5,10,3,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("amair2_el2",		CPENC (3,4,10,3,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("amair2_el3",		CPENC (3,6,10,3,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
   SYSREG ("amcfgr_el0",		CPENC (3,3,13,2,1),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (V8_4A))
   SYSREG ("amcg1idr_el0",	CPENC (3,3,13,2,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (V8_6A))
   SYSREG ("amcgcr_el0",		CPENC (3,3,13,2,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (V8_4A))
@@ -400,6 +404,7 @@
   SYSREG ("erxaddr_el1",	CPENC (3,0,5,4,3),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
   SYSREG ("erxctlr_el1",	CPENC (3,0,5,4,1),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
   SYSREG ("erxfr_el1",		CPENC (3,0,5,4,0),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (RAS))
+  SYSREG ("erxgsr_el1",		CPENC (3,0,5,3,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (RASv2))
   SYSREG ("erxmisc0_el1",	CPENC (3,0,5,5,0),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
   SYSREG ("erxmisc1_el1",	CPENC (3,0,5,5,1),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
   SYSREG ("erxmisc2_el1",	CPENC (3,0,5,5,2),	F_ARCHEXT,		AARCH64_FEATURE (RAS))
@@ -438,10 +443,14 @@
   SYSREG ("hcr_el2",		CPENC (3,4,1,1,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("hcrx_el2",		CPENC (3,4,1,2,2),	F_ARCHEXT,		AARCH64_FEATURE (V8_7A))
   SYSREG ("hdfgrtr_el2",	CPENC (3,4,3,1,4),	F_ARCHEXT,		AARCH64_FEATURE (V8_6A))
+  SYSREG ("hdfgrtr2_el2",	CPENC (3,4,3,1,0),	F_ARCHEXT,		AARCH64_FEATURE (FGT2))
   SYSREG ("hdfgwtr_el2",	CPENC (3,4,3,1,5),	F_ARCHEXT,		AARCH64_FEATURE (V8_6A))
+  SYSREG ("hdfgwtr2_el2",	CPENC (3,4,3,1,1),	F_ARCHEXT,		AARCH64_FEATURE (FGT2))
   SYSREG ("hfgitr_el2",		CPENC (3,4,1,1,6),	F_ARCHEXT,		AARCH64_FEATURE (V8_6A))
   SYSREG ("hfgrtr_el2",		CPENC (3,4,1,1,4),	F_ARCHEXT,		AARCH64_FEATURE (V8_6A))
+  SYSREG ("hfgrtr2_el2",	CPENC (3,4,3,1,2),	F_ARCHEXT,		AARCH64_FEATURE (FGT2))
   SYSREG ("hfgwtr_el2",		CPENC (3,4,1,1,5),	F_ARCHEXT,		AARCH64_FEATURE (V8_6A))
+  SYSREG ("hfgwtr2_el2",	CPENC (3,4,3,1,3),	F_ARCHEXT,		AARCH64_FEATURE (FGT2))
   SYSREG ("hpfar_el2",		CPENC (3,4,6,0,4),	0,			AARCH64_NO_FEATURES)
   SYSREG ("hstr_el2",		CPENC (3,4,1,1,3),	0,			AARCH64_NO_FEATURES)
   SYSREG ("icc_ap0r0_el1",	CPENC (3,0,12,8,4),	0,			AARCH64_NO_FEATURES)
@@ -515,6 +524,8 @@
   SYSREG ("id_aa64mmfr0_el1",	CPENC (3,0,0,7,0),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("id_aa64mmfr1_el1",	CPENC (3,0,0,7,1),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("id_aa64mmfr2_el1",	CPENC (3,0,0,7,2),	F_REG_READ,		AARCH64_NO_FEATURES)
+  SYSREG ("id_aa64mmfr3_el1",	CPENC (3,0,0,7,3),	F_REG_READ,		AARCH64_NO_FEATURES)
+  SYSREG ("id_aa64mmfr4_el1",	CPENC (3,0,0,7,4),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("id_aa64pfr0_el1",	CPENC (3,0,0,4,0),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("id_aa64pfr1_el1",	CPENC (3,0,0,4,1),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("id_aa64smfr0_el1",	CPENC (3,0,0,4,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (SME))
@@ -549,12 +560,17 @@
   SYSREG ("mair_el12",		CPENC (3,5,10,2,0),	F_ARCHEXT,		AARCH64_FEATURE (V8_1A))
   SYSREG ("mair_el2",		CPENC (3,4,10,2,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mair_el3",		CPENC (3,6,10,2,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("mair2_el1",		CPENC (3,0,10,2,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("mair2_el12",		CPENC (3,5,10,2,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("mair2_el2",		CPENC (3,4,10,1,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
+  SYSREG ("mair2_el3",		CPENC (3,6,10,1,1),	F_ARCHEXT,		AARCH64_FEATURE (AIE))
   SYSREG ("mdccint_el1",	CPENC (2,0,0,2,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mdccsr_el0",		CPENC (2,3,0,1,0),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("mdcr_el2",		CPENC (3,4,1,1,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mdcr_el3",		CPENC (3,6,1,3,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mdrar_el1",		CPENC (2,0,1,0,0),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("mdscr_el1",		CPENC (2,0,0,2,2),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("mdselr_el1",		CPENC (2,0,0,4,2),	F_ARCHEXT,		AARCH64_FEATURE (DEBUGv8p9))
   SYSREG ("mecid_a0_el2",	CPENC (3,4,10,8,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mecid_a1_el2",	CPENC (3,4,10,8,3),	0,			AARCH64_NO_FEATURES)
   SYSREG ("mecid_p0_el2",	CPENC (3,4,10,8,0),	0,			AARCH64_NO_FEATURES)
@@ -593,19 +609,31 @@
   SYSREG ("oseccr_el1",		CPENC (2,0,0,6,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("oslar_el1",		CPENC (2,0,1,0,4),	F_REG_WRITE,		AARCH64_NO_FEATURES)
   SYSREG ("oslsr_el1",		CPENC (2,0,1,1,4),	F_REG_READ,		AARCH64_NO_FEATURES)
+  SYSREG ("pir_el1",		CPENC (3,0,10,2,3),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pir_el12",		CPENC (3,5,10,2,3),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pir_el2",		CPENC (3,4,10,2,3),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pir_el3",		CPENC (3,6,10,2,3),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pire0_el1",		CPENC (3,0,10,2,2),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pire0_el12",		CPENC (3,5,10,2,2),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
+  SYSREG ("pire0_el2",		CPENC (3,4,10,2,2),	F_ARCHEXT,		AARCH64_FEATURE (S1PIE))
   SYSREG ("pan",		CPENC (3,0,4,2,3),	F_ARCHEXT,		AARCH64_FEATURE (PAN))
   SYSREG ("par_el1",		CPENC (3,0,7,4,0),	F_REG_128,		AARCH64_NO_FEATURES)
+  SYSREG ("pfar_el1",		CPENC (3,0,6,0,5),      F_ARCHEXT,              AARCH64_FEATURE (PFAR))
+  SYSREG ("pfar_el12",		CPENC (3,5,6,0,5),      F_ARCHEXT,              AARCH64_FEATURE (PFAR))
+  SYSREG ("pfar_el2",		CPENC (3,4,6,0,5),      F_ARCHEXT,              AARCH64_FEATURE (PFAR))
   SYSREG ("pmbidr_el1",		CPENC (3,0,9,10,7),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PROFILE))
   SYSREG ("pmblimitr_el1",	CPENC (3,0,9,10,0),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmbptr_el1",		CPENC (3,0,9,10,1),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmbsr_el1",		CPENC (3,0,9,10,3),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmccfiltr_el0",	CPENC (3,3,14,15,7),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmccntr_el0",	CPENC (3,3,9,13,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("pmccntsvr_el1",	CPENC (2,0,14,11,7),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
   SYSREG ("pmceid0_el0",	CPENC (3,3,9,12,6),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("pmceid1_el0",	CPENC (3,3,9,12,7),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("pmcntenclr_el0",	CPENC (3,3,9,12,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmcntenset_el0",	CPENC (3,3,9,12,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmcr_el0",		CPENC (3,3,9,12,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("pmecr_el1",		CPENC (3,0,9,14,5),	F_ARCHEXT,		AARCH64_FEATURE (SEBEP))
   SYSREG ("pmevcntr0_el0",	CPENC (3,3,14,8,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevcntr10_el0",	CPENC (3,3,14,9,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevcntr11_el0",	CPENC (3,3,14,9,3),	0,			AARCH64_NO_FEATURES)
@@ -637,6 +665,37 @@
   SYSREG ("pmevcntr7_el0",	CPENC (3,3,14,8,7),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevcntr8_el0",	CPENC (3,3,14,9,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevcntr9_el0",	CPENC (3,3,14,9,1),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("pmevcntsvr0_el1",	CPENC (2,0,14,8,0),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr10_el1",	CPENC (2,0,14,9,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr11_el1",	CPENC (2,0,14,9,3),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr12_el1",	CPENC (2,0,14,9,4),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr13_el1",	CPENC (2,0,14,9,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr14_el1",	CPENC (2,0,14,9,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr15_el1",	CPENC (2,0,14,9,7),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr16_el1",	CPENC (2,0,14,10,0),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr17_el1",	CPENC (2,0,14,10,1),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr18_el1",	CPENC (2,0,14,10,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr19_el1",	CPENC (2,0,14,10,3),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr1_el1",	CPENC (2,0,14,8,1),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr20_el1",	CPENC (2,0,14,10,4),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr21_el1",	CPENC (2,0,14,10,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr22_el1",	CPENC (2,0,14,10,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr23_el1",	CPENC (2,0,14,10,7),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr24_el1",	CPENC (2,0,14,11,0),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr25_el1",	CPENC (2,0,14,11,1),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr26_el1",	CPENC (2,0,14,11,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr27_el1",	CPENC (2,0,14,11,3),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr28_el1",	CPENC (2,0,14,11,4),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr29_el1",	CPENC (2,0,14,11,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr2_el1",	CPENC (2,0,14,8,2),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr30_el1",	CPENC (2,0,14,11,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr3_el1",	CPENC (2,0,14,8,3),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr4_el1",	CPENC (2,0,14,8,4),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr5_el1",	CPENC (2,0,14,8,5),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr6_el1",	CPENC (2,0,14,8,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr7_el1",	CPENC (2,0,14,8,7),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr8_el1",	CPENC (2,0,14,9,0),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
+  SYSREG ("pmevcntsvr9_el1",	CPENC (2,0,14,9,1),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_SS))
   SYSREG ("pmevtyper0_el0",	CPENC (3,3,14,12,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevtyper10_el0",	CPENC (3,3,14,13,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevtyper11_el0",	CPENC (3,3,14,13,3),	0,			AARCH64_NO_FEATURES)
@@ -668,6 +727,10 @@
   SYSREG ("pmevtyper7_el0",	CPENC (3,3,14,12,7),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevtyper8_el0",	CPENC (3,3,14,13,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmevtyper9_el0",	CPENC (3,3,14,13,1),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("pmiar_el1",		CPENC (3,0,9,14,7),	F_ARCHEXT,		AARCH64_FEATURE (SEBEP))
+  SYSREG ("pmicfiltr_el0",	CPENC (3,3,9,6,0),	F_ARCHEXT,		AARCH64_FEATURE (PMUv3_ICNTR))
+  SYSREG ("pmicntr_el0",	CPENC (3,3,9,4,0),	F_ARCHEXT,		AARCH64_FEATURE (PMUv3_ICNTR))
+  SYSREG ("pmicntsvr_el1",	CPENC (2,0,14,12,0),	F_REG_READ|F_ARCHEXT,   AARCH64_FEATURE (PMUv3_SS))
   SYSREG ("pmintenclr_el1",	CPENC (3,0,9,14,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmintenset_el1",	CPENC (3,0,9,14,1),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmmir_el1",		CPENC (3,0,9,14,6),	F_REG_READ|F_ARCHEXT,	AARCH64_FEATURE (V8_4A))
@@ -676,6 +739,7 @@
   SYSREG ("pmscr_el1",		CPENC (3,0,9,9,0),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmscr_el12",		CPENC (3,5,9,9,0),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmscr_el2",		CPENC (3,4,9,9,0),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
+  SYSREG ("pmsdsfr_el1",	CPENC (3,4,9,10,4),	F_ARCHEXT,		AARCH64_FEATURE (SPE_FDS))
   SYSREG ("pmselr_el0",		CPENC (3,3,9,12,5),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmsevfr_el1",	CPENC (3,0,9,9,5),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmsfcr_el1",		CPENC (3,0,9,9,4),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
@@ -684,10 +748,18 @@
   SYSREG ("pmsirr_el1",		CPENC (3,0,9,9,3),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmslatfr_el1",	CPENC (3,0,9,9,6),	F_ARCHEXT,		AARCH64_FEATURE (PROFILE))
   SYSREG ("pmsnevfr_el1",	CPENC (3,0,9,9,1),	F_ARCHEXT,		AARCH64_FEATURE (V8_7A))
+  SYSREG ("pmsscr_el1",		CPENC (3,0,9,13,3),	F_ARCHEXT,		AARCH64_FEATURE (PMUv3_SS))
   SYSREG ("pmswinc_el0",	CPENC (3,3,9,12,4),	F_REG_WRITE,		AARCH64_NO_FEATURES)
+  SYSREG ("pmuacr_el1",		CPENC (3,0,9,14,4),	F_ARCHEXT,		AARCH64_FEATURE (PMUv3p9))
   SYSREG ("pmuserenr_el0",	CPENC (3,3,9,14,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmxevcntr_el0",	CPENC (3,3,9,13,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("pmxevtyper_el0",	CPENC (3,3,9,13,1),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("pmzr_el0",		CPENC (3,3,9,13,4),	F_REG_WRITE|F_ARCHEXT,	AARCH64_FEATURE (PMUv3_ICNTR))
+  SYSREG ("por_el0",		CPENC (3,3,10,2,4),	F_ARCHEXT,		AARCH64_FEATURE (S1POE))
+  SYSREG ("por_el1",		CPENC (3,0,10,2,4),	F_ARCHEXT,		AARCH64_FEATURE (S1POE))
+  SYSREG ("por_el12",		CPENC (3,5,10,2,4),	F_ARCHEXT,		AARCH64_FEATURE (S1POE))
+  SYSREG ("por_el2",		CPENC (3,4,10,2,4),	F_ARCHEXT,		AARCH64_FEATURE (S1POE))
+  SYSREG ("por_el3",		CPENC (3,6,10,2,4),	F_ARCHEXT,		AARCH64_FEATURE (S1POE))
   SYSREG ("prbar10_el1",	CPENC (3,0,6,13,0),	F_ARCHEXT,		AARCH64_FEATURE (V8R))
   SYSREG ("prbar10_el2",	CPENC (3,4,6,13,0),	F_ARCHEXT,		AARCH64_FEATURE (V8R))
   SYSREG ("prbar11_el1",	CPENC (3,0,6,13,4),	F_ARCHEXT,		AARCH64_FEATURE (V8R))
@@ -773,6 +845,10 @@
   SYSREG ("sctlr_el12",		CPENC (3,5,1,0,0),	F_ARCHEXT,		AARCH64_FEATURE (V8_1A))
   SYSREG ("sctlr_el2",		CPENC (3,4,1,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("sctlr_el3",		CPENC (3,6,1,0,0),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("sctlr2_el1",		CPENC (3,0,1,0,3),	F_ARCHEXT,		AARCH64_FEATURE (SCTLR2))
+  SYSREG ("sctlr2_el12",	CPENC (3,5,1,0,3),	F_ARCHEXT,		AARCH64_FEATURE (SCTLR2))
+  SYSREG ("sctlr2_el2",		CPENC (3,4,1,0,3),	F_ARCHEXT,		AARCH64_FEATURE (SCTLR2))
+  SYSREG ("sctlr2_el3",		CPENC (3,6,1,0,3),	F_ARCHEXT,		AARCH64_FEATURE (SCTLR2))
   SYSREG ("scxtnum_el0",	CPENC (3,3,13,0,7),	F_ARCHEXT,		AARCH64_FEATURE (SCXTNUM))
   SYSREG ("scxtnum_el1",	CPENC (3,0,13,0,7),	F_ARCHEXT,		AARCH64_FEATURE (SCXTNUM))
   SYSREG ("scxtnum_el12",	CPENC (3,5,13,0,7),	F_ARCHEXT,		AARCH64_FEATURE (SCXTNUM))
@@ -803,11 +879,16 @@
   SYSREG ("spsr_und",		CPENC (3,4,4,3,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("ssbs",		CPENC (3,3,4,2,6),	F_ARCHEXT,		AARCH64_FEATURE (SSBS))
   SYSREG ("svcr",		CPENC (3,3,4,2,2),	F_ARCHEXT,		AARCH64_FEATURE (SME))
+  SYSREG ("s2pir_el2",		CPENC (3,4,10,2,5),	F_ARCHEXT,		AARCH64_FEATURE (S2PIE))
+  SYSREG ("s2por_el1",		CPENC (3,0,10,2,5),	F_ARCHEXT,		AARCH64_FEATURE (S2POE))
   SYSREG ("tco",		CPENC (3,3,4,2,7),	F_ARCHEXT,		AARCH64_FEATURE (MEMTAG))
   SYSREG ("tcr_el1",		CPENC (3,0,2,0,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("tcr_el12",		CPENC (3,5,2,0,2),	F_ARCHEXT,		AARCH64_FEATURE (V8_1A))
   SYSREG ("tcr_el2",		CPENC (3,4,2,0,2),	0,			AARCH64_NO_FEATURES)
   SYSREG ("tcr_el3",		CPENC (3,6,2,0,2),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("tcr2_el1",		CPENC (3,0,2,0,3),	F_ARCHEXT,		AARCH64_FEATURE (TCR2))
+  SYSREG ("tcr2_el12",		CPENC (3,5,2,0,3),	F_ARCHEXT,		AARCH64_FEATURE (TCR2))
+  SYSREG ("tcr2_el2",		CPENC (3,4,2,0,3),	F_ARCHEXT,		AARCH64_FEATURE (TCR2))
   SYSREG ("teecr32_el1",	CPENC (2,2,0,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("teehbr32_el1",	CPENC (2,2,1,0,0),	0,			AARCH64_NO_FEATURES)
   SYSREG ("tfsr_el1",		CPENC (3,0,5,6,0),	F_ARCHEXT,		AARCH64_FEATURE (MEMTAG))
@@ -944,6 +1025,10 @@
   SYSREG ("trcimspec6",		CPENC (2,1,0,6,7),	0,			AARCH64_NO_FEATURES)
   SYSREG ("trcimspec7",		CPENC (2,1,0,7,7),	0,			AARCH64_NO_FEATURES)
   SYSREG ("trcitctrl",		CPENC (2,1,7,0,4),	0,			AARCH64_NO_FEATURES)
+  SYSREG ("trcitecr_el1",	CPENC (3,0,1,2,3),	F_ARCHEXT,		AARCH64_FEATURE (ITE))
+  SYSREG ("trcitecr_el12",	CPENC (3,5,1,2,3),	F_ARCHEXT,		AARCH64_FEATURE (ITE))
+  SYSREG ("trcitecr_el2",	CPENC (3,4,1,2,3),	F_ARCHEXT,		AARCH64_FEATURE (ITE))
+  SYSREG ("trciteedcr",		CPENC (2,1,0,2,1),	F_ARCHEXT,		AARCH64_FEATURE (ITE))
   SYSREG ("trclar",		CPENC (2,1,7,12,6),	F_REG_WRITE,		AARCH64_NO_FEATURES)
   SYSREG ("trclsr",		CPENC (2,1,7,13,6),	F_REG_READ,		AARCH64_NO_FEATURES)
   SYSREG ("trcoslar",		CPENC (2,1,1,0,4),	F_REG_WRITE,		AARCH64_NO_FEATURES)
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 157a0b9dfa5..45e901cda64 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -297,6 +297,26 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE = AARCH64_FL_SM_OFF;
 #define AARCH64_FL_SCXTNUM	   AARCH64_FL_V8_5A
 #define AARCH64_FL_ID_PFR2	   AARCH64_FL_V8_5A
 
+/* Armv8.9-A extension feature bits defined in Binutils but absent from GCC,
+   aliased to their base architecture.  */
+#define AARCH64_FL_AIE		   AARCH64_FL_V8_9A
+#define AARCH64_FL_DEBUGv8p9	   AARCH64_FL_V8_9A
+#define AARCH64_FL_FGT2	   AARCH64_FL_V8_9A
+#define AARCH64_FL_ITE		   AARCH64_FL_V8_9A
+#define AARCH64_FL_PFAR	   AARCH64_FL_V8_9A
+#define AARCH64_FL_PMUv3_ICNTR	   AARCH64_FL_V8_9A
+#define AARCH64_FL_PMUv3_SS	   AARCH64_FL_V8_9A
+#define AARCH64_FL_PMUv3p9	   AARCH64_FL_V8_9A
+#define AARCH64_FL_RASv2	   AARCH64_FL_V8_9A
+#define AARCH64_FL_S1PIE	   AARCH64_FL_V8_9A
+#define AARCH64_FL_S1POE	   AARCH64_FL_V8_9A
+#define AARCH64_FL_S2PIE	   AARCH64_FL_V8_9A
+#define AARCH64_FL_S2POE	   AARCH64_FL_V8_9A
+#define AARCH64_FL_SCTLR2	   AARCH64_FL_V8_9A
+#define AARCH64_FL_SEBEP	   AARCH64_FL_V8_9A
+#define AARCH64_FL_SPE_FDS	   AARCH64_FL_V8_9A
+#define AARCH64_FL_TCR2	   AARCH64_FL_V8_9A
+
 /* SHA2 is an optional extension to AdvSIMD.  */
 #define TARGET_SHA2 (AARCH64_ISA_SHA2)
 
diff --git a/gcc/testsuite/gcc.target/aarch64/acle/rwsr-armv8p9.c b/gcc/testsuite/gcc.target/aarch64/acle/rwsr-armv8p9.c
new file mode 100644
index 00000000000..e2f297bbeeb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/acle/rwsr-armv8p9.c
@@ -0,0 +1,99 @@
+/* Ensure support is present for all armv8.9-a system registers.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv8.9-a" } */
+#include <arm_acle.h>
+void
+readwrite_armv8p9a_sysregs ()
+{
+  long long int a;
+
+  /* Write-only system registers.  */
+  __arm_wsr64 ("pmzr_el0", a); /* { dg-final { scan-assembler "msr\ts3_3_c9_c13_4, x0" } } */
+
+  /* Read/write or write-only system registers.  */
+  a = __arm_rsr64 ("amair2_el1");		/* { { dg-final { scan-assembler "s3_0_c10_c3_1" } } */
+  a = __arm_rsr64 ("amair2_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c10_c3_1" } } */
+  a = __arm_rsr64 ("amair2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c3_1" } } */
+  a = __arm_rsr64 ("amair2_el3"); /* { { dg-final { scan-assembler "mrs\tx0, s3_6_c10_c3_1" } } */
+  a = __arm_rsr64 ("erxgsr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c5_c3_2" } } */
+  a = __arm_rsr64 ("hdfgrtr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c3_c1_0" } } */
+  a = __arm_rsr64 ("hdfgwtr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c3_c1_1" } } */
+  a = __arm_rsr64 ("hfgrtr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c3_c1_2" } } */
+  a = __arm_rsr64 ("hfgwtr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c3_c1_3" } } */
+  a = __arm_rsr64 ("id_aa64mmfr3_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c0_c7_3" } } */
+  a = __arm_rsr64 ("id_aa64mmfr4_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c0_c7_4" } } */
+  a = __arm_rsr64 ("mair2_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c10_c2_1" } } */
+  a = __arm_rsr64 ("mair2_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c10_c2_1" } } */
+  a = __arm_rsr64 ("mair2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c1_1" } } */
+  a = __arm_rsr64 ("mair2_el3"); /* { { dg-final { scan-assembler "mrs\tx0, s3_6_c10_c1_1" } } */
+  a = __arm_rsr64 ("mdselr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c0_c4_2" } } */
+  a = __arm_rsr64 ("pir_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c10_c2_3" } } */
+  a = __arm_rsr64 ("pir_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c10_c2_3" } } */
+  a = __arm_rsr64 ("pir_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c2_3" } } */
+  a = __arm_rsr64 ("pir_el3"); /* { { dg-final { scan-assembler "mrs\tx0, s3_6_c10_c2_3" } } */
+  a = __arm_rsr64 ("pire0_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c10_c2_2" } } */
+  a = __arm_rsr64 ("pire0_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c10_c2_2" } } */
+  a = __arm_rsr64 ("pire0_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c2_2" } } */
+  a = __arm_rsr64 ("pfar_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c6_c0_5" } } */
+  a = __arm_rsr64 ("pfar_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c6_c0_5" } } */
+  a = __arm_rsr64 ("pfar_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c6_c0_5" } } */
+  a = __arm_rsr64 ("pmccntsvr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_7" } } */
+  a = __arm_rsr64 ("pmecr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c9_c14_5" } } */
+  a = __arm_rsr64 ("pmevcntsvr0_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_0" } } */
+  a = __arm_rsr64 ("pmevcntsvr10_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_2" } } */
+  a = __arm_rsr64 ("pmevcntsvr11_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_3" } } */
+  a = __arm_rsr64 ("pmevcntsvr12_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_4" } } */
+  a = __arm_rsr64 ("pmevcntsvr13_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_5" } } */
+  a = __arm_rsr64 ("pmevcntsvr14_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_6" } } */
+  a = __arm_rsr64 ("pmevcntsvr15_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_7" } } */
+  a = __arm_rsr64 ("pmevcntsvr16_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_0" } } */
+  a = __arm_rsr64 ("pmevcntsvr17_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_1" } } */
+  a = __arm_rsr64 ("pmevcntsvr18_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_2" } } */
+  a = __arm_rsr64 ("pmevcntsvr19_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_3" } } */
+  a = __arm_rsr64 ("pmevcntsvr1_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_1" } } */
+  a = __arm_rsr64 ("pmevcntsvr20_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_4" } } */
+  a = __arm_rsr64 ("pmevcntsvr21_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_5" } } */
+  a = __arm_rsr64 ("pmevcntsvr22_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_6" } } */
+  a = __arm_rsr64 ("pmevcntsvr23_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c10_7" } } */
+  a = __arm_rsr64 ("pmevcntsvr24_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_0" } } */
+  a = __arm_rsr64 ("pmevcntsvr25_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_1" } } */
+  a = __arm_rsr64 ("pmevcntsvr26_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_2" } } */
+  a = __arm_rsr64 ("pmevcntsvr27_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_3" } } */
+  a = __arm_rsr64 ("pmevcntsvr28_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_4" } } */
+  a = __arm_rsr64 ("pmevcntsvr29_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_5" } } */
+  a = __arm_rsr64 ("pmevcntsvr2_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_2" } } */
+  a = __arm_rsr64 ("pmevcntsvr30_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c11_6" } } */
+  a = __arm_rsr64 ("pmevcntsvr3_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_3" } } */
+  a = __arm_rsr64 ("pmevcntsvr4_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_4" } } */
+  a = __arm_rsr64 ("pmevcntsvr5_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_5" } } */
+  a = __arm_rsr64 ("pmevcntsvr6_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_6" } } */
+  a = __arm_rsr64 ("pmevcntsvr7_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c8_7" } } */
+  a = __arm_rsr64 ("pmevcntsvr8_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_0" } } */
+  a = __arm_rsr64 ("pmevcntsvr9_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c9_1" } } */
+  a = __arm_rsr64 ("pmiar_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c9_c14_7" } } */
+  a = __arm_rsr64 ("pmicfiltr_el0"); /* { { dg-final { scan-assembler "mrs\tx0, s3_3_c9_c6_0" } } */
+  a = __arm_rsr64 ("pmicntr_el0"); /* { { dg-final { scan-assembler "mrs\tx0, s3_3_c9_c4_0" } } */
+  a = __arm_rsr64 ("pmicntsvr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s2_0_c14_c12_0" } } */
+  a = __arm_rsr64 ("pmsdsfr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c9_c10_4" } } */
+  a = __arm_rsr64 ("pmsscr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c9_c13_3" } } */
+  a = __arm_rsr64 ("pmuacr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c9_c14_4" } } */
+  a = __arm_rsr64 ("por_el0"); /* { { dg-final { scan-assembler "mrs\tx0, s3_3_c10_c2_4" } } */
+  a = __arm_rsr64 ("por_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c10_c2_4" } } */
+  a = __arm_rsr64 ("por_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c10_c2_4" } } */
+  a = __arm_rsr64 ("por_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c2_4" } } */
+  a = __arm_rsr64 ("por_el3"); /* { { dg-final { scan-assembler "mrs\tx0, s3_6_c10_c2_4" } } */
+  a = __arm_rsr64 ("sctlr2_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c1_c0_3" } } */
+  a = __arm_rsr64 ("sctlr2_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c1_c0_3" } } */
+  a = __arm_rsr64 ("sctlr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c1_c0_3" } } */
+  a = __arm_rsr64 ("sctlr2_el3"); /* { { dg-final { scan-assembler "mrs\tx0, s3_6_c1_c0_3" } } */
+  a = __arm_rsr64 ("s2pir_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c10_c2_5" } } */
+  a = __arm_rsr64 ("s2por_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c10_c2_5" } } */
+  a = __arm_rsr64 ("tcr2_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c2_c0_3" } } */
+  a = __arm_rsr64 ("tcr2_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c2_c0_3" } } */
+  a = __arm_rsr64 ("tcr2_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c2_c0_3" } } */
+  a = __arm_rsr64 ("trcitecr_el1"); /* { { dg-final { scan-assembler "mrs\tx0, s3_0_c1_c2_3" } } */
+  a = __arm_rsr64 ("trcitecr_el12"); /* { { dg-final { scan-assembler "mrs\tx0, s3_5_c1_c2_3" } } */
+  a = __arm_rsr64 ("trcitecr_el2"); /* { { dg-final { scan-assembler "mrs\tx0, s3_4_c1_c2_3" } } */
+  a = __arm_rsr64 ("trciteedcr"); /* { { dg-final { scan-assembler "mrs\tx0, s2_1_c0_c2_1" } } */
+}
+
