From: Luis Machado Date: Mon, 15 Jun 2020 16:52:27 +0000 (-0300) Subject: AArch64: Add target description/feature for MTE registers X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c1bd443b4d86e12f2a97856270e40df24c7f3df7;p=binutils-gdb.git AArch64: Add target description/feature for MTE registers This patch adds a target description and feature "mte" for aarch64. It includes one new register, tag_ctl, that can be used to configure the tag generation rules and sync/async modes. It is 64-bit in size. The patch also adjusts the code that creates the target descriptions at runtime based on CPU feature checks. gdb/ChangeLog: 2021-03-24 Luis Machado * aarch64-linux-nat.c (aarch64_linux_nat_target::read_description): Take MTE flag into account. Slight refactor to hwcap flag checking. * aarch64-linux-tdep.c (aarch64_linux_core_read_description): Likewise. * aarch64-tdep.c (tdesc_aarch64_list): Add one more dimension for MTE. (aarch64_read_description): Add mte_p parameter and update to use it. Update the documentation. (aarch64_gdbarch_init): Update call to aarch64_read_description. * aarch64-tdep.h (aarch64_read_description): Add mte_p parameter. * arch/aarch64.c: Include ../features/aarch64-mte.c. (aarch64_create_target_description): Add mte_p parameter and update the code to use it. * arch/aarch64.h (aarch64_create_target_description): Add mte_p parameter. * features/Makefile (FEATURE_XMLFILES): Add aarch64-mte.xml. * features/aarch64-mte.c: New file, generated. * features/aarch64-mte.xml: New file. gdbserver/ChangeLog: 2021-03-24 Luis Machado * linux-aarch64-ipa.cc (get_ipa_tdesc): Update call to aarch64_linux_read_description. (initialize_low_tracepoint): Likewise. * linux-aarch64-low.cc (aarch64_target::low_arch_setup): Take MTE flag into account. * linux-aarch64-tdesc.cc (tdesc_aarch64_list): Add one more dimension for MTE. (aarch64_linux_read_description): Add mte_p parameter and update to use it. * linux-aarch64-tdesc.h (aarch64_linux_read_description): Add mte_p parameter. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index a7d89022010..33a58cb06d9 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,26 @@ +2021-03-24 Luis Machado + + * aarch64-linux-nat.c + (aarch64_linux_nat_target::read_description): Take MTE flag into + account. + Slight refactor to hwcap flag checking. + * aarch64-linux-tdep.c + (aarch64_linux_core_read_description): Likewise. + * aarch64-tdep.c (tdesc_aarch64_list): Add one more dimension for + MTE. + (aarch64_read_description): Add mte_p parameter and update to use it. + Update the documentation. + (aarch64_gdbarch_init): Update call to aarch64_read_description. + * aarch64-tdep.h (aarch64_read_description): Add mte_p parameter. + * arch/aarch64.c: Include ../features/aarch64-mte.c. + (aarch64_create_target_description): Add mte_p parameter and update + the code to use it. + * arch/aarch64.h (aarch64_create_target_description): Add mte_p + parameter. + * features/Makefile (FEATURE_XMLFILES): Add aarch64-mte.xml. + * features/aarch64-mte.c: New file, generated. + * features/aarch64-mte.xml: New file. + 2021-03-24 Luis Machado * Makefile.in (HFILES_NO_SRCDIR): Add arch/aarch64-mte-linux.h. diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c index 424e616b042..c56880e33d7 100644 --- a/gdb/aarch64-linux-nat.c +++ b/gdb/aarch64-linux-nat.c @@ -653,9 +653,12 @@ aarch64_linux_nat_target::read_description () return aarch32_read_description (); CORE_ADDR hwcap = linux_get_hwcap (this); + CORE_ADDR hwcap2 = linux_get_hwcap2 (this); - return aarch64_read_description (aarch64_sve_get_vq (tid), - hwcap & AARCH64_HWCAP_PACA); + bool pauth_p = hwcap & AARCH64_HWCAP_PACA; + bool mte_p = hwcap2 & HWCAP2_MTE; + + return aarch64_read_description (aarch64_sve_get_vq (tid), pauth_p, mte_p); } /* Convert a native/host siginfo object, into/from the siginfo in the diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c index a6044ead49f..1c45770a287 100644 --- a/gdb/aarch64-linux-tdep.c +++ b/gdb/aarch64-linux-tdep.c @@ -731,9 +731,12 @@ aarch64_linux_core_read_description (struct gdbarch *gdbarch, struct target_ops *target, bfd *abfd) { CORE_ADDR hwcap = linux_get_hwcap (target); + CORE_ADDR hwcap2 = linux_get_hwcap2 (target); + bool pauth_p = hwcap & AARCH64_HWCAP_PACA; + bool mte_p = hwcap2 & HWCAP2_MTE; return aarch64_read_description (aarch64_linux_core_read_vq (gdbarch, abfd), - hwcap & AARCH64_HWCAP_PACA); + pauth_p, mte_p); } /* Implementation of `gdbarch_stap_is_single_operand', as defined in diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c index 3ac0564dd9a..685c50b84da 100644 --- a/gdb/aarch64-tdep.c +++ b/gdb/aarch64-tdep.c @@ -58,7 +58,7 @@ #define HA_MAX_NUM_FLDS 4 /* All possible aarch64 target descriptors. */ -static target_desc *tdesc_aarch64_list[AARCH64_MAX_SVE_VQ + 1][2/*pauth*/]; +static target_desc *tdesc_aarch64_list[AARCH64_MAX_SVE_VQ + 1][2/*pauth*/][2 /* mte */]; /* The standard register names, and all the valid aliases for them. */ static const struct @@ -3260,21 +3260,23 @@ aarch64_displaced_step_hw_singlestep (struct gdbarch *gdbarch) /* Get the correct target description for the given VQ value. If VQ is zero then it is assumed SVE is not supported. - (It is not possible to set VQ to zero on an SVE system). */ + (It is not possible to set VQ to zero on an SVE system). + + MTE_P indicates the presence of the Memory Tagging Extension feature. */ const target_desc * -aarch64_read_description (uint64_t vq, bool pauth_p) +aarch64_read_description (uint64_t vq, bool pauth_p, bool mte_p) { if (vq > AARCH64_MAX_SVE_VQ) error (_("VQ is %" PRIu64 ", maximum supported value is %d"), vq, AARCH64_MAX_SVE_VQ); - struct target_desc *tdesc = tdesc_aarch64_list[vq][pauth_p]; + struct target_desc *tdesc = tdesc_aarch64_list[vq][pauth_p][mte_p]; if (tdesc == NULL) { - tdesc = aarch64_create_target_description (vq, pauth_p); - tdesc_aarch64_list[vq][pauth_p] = tdesc; + tdesc = aarch64_create_target_description (vq, pauth_p, mte_p); + tdesc_aarch64_list[vq][pauth_p][mte_p] = tdesc; } return tdesc; @@ -3374,7 +3376,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) value. */ const struct target_desc *tdesc = info.target_desc; if (!tdesc_has_registers (tdesc) || vq != aarch64_get_tdesc_vq (tdesc)) - tdesc = aarch64_read_description (vq, false); + tdesc = aarch64_read_description (vq, false, false); gdb_assert (tdesc); feature_core = tdesc_find_feature (tdesc,"org.gnu.gdb.aarch64.core"); diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h index 3783f5cd5e1..f6d24292f84 100644 --- a/gdb/aarch64-tdep.h +++ b/gdb/aarch64-tdep.h @@ -102,7 +102,8 @@ struct gdbarch_tdep } }; -const target_desc *aarch64_read_description (uint64_t vq, bool pauth_p); +const target_desc *aarch64_read_description (uint64_t vq, bool pauth_p, + bool mte_p); extern int aarch64_process_record (struct gdbarch *gdbarch, struct regcache *regcache, CORE_ADDR addr); diff --git a/gdb/arch/aarch64.c b/gdb/arch/aarch64.c index d243116be46..c38f8312c90 100644 --- a/gdb/arch/aarch64.c +++ b/gdb/arch/aarch64.c @@ -23,11 +23,12 @@ #include "../features/aarch64-fpu.c" #include "../features/aarch64-sve.c" #include "../features/aarch64-pauth.c" +#include "../features/aarch64-mte.c" /* See arch/aarch64.h. */ target_desc * -aarch64_create_target_description (uint64_t vq, bool pauth_p) +aarch64_create_target_description (uint64_t vq, bool pauth_p, bool mte_p) { target_desc_up tdesc = allocate_target_description (); @@ -47,5 +48,9 @@ aarch64_create_target_description (uint64_t vq, bool pauth_p) if (pauth_p) regnum = create_feature_aarch64_pauth (tdesc.get (), regnum); + /* Memory tagging extension registers. */ + if (mte_p) + regnum = create_feature_aarch64_mte (tdesc.get (), regnum); + return tdesc.release (); } diff --git a/gdb/arch/aarch64.h b/gdb/arch/aarch64.h index 6c98d5fa379..0eb702c5b5e 100644 --- a/gdb/arch/aarch64.h +++ b/gdb/arch/aarch64.h @@ -25,9 +25,12 @@ /* Create the aarch64 target description. A non zero VQ value indicates both the presence of SVE and the Vector Quotient - the number of 128bit chunks in an SVE Z register. HAS_PAUTH_P indicates the presence of the PAUTH - feature. */ + feature. -target_desc *aarch64_create_target_description (uint64_t vq, bool has_pauth_p); + MTE_P indicates the presence of the Memory Tagging Extension feature. */ + +target_desc *aarch64_create_target_description (uint64_t vq, bool has_pauth_p, + bool mte_p); /* Register numbers of various important registers. Note that on SVE, the Z registers reuse the V register numbers and the V diff --git a/gdb/features/Makefile b/gdb/features/Makefile index 5049b88d3ea..522ad58aab0 100644 --- a/gdb/features/Makefile +++ b/gdb/features/Makefile @@ -202,6 +202,7 @@ $(outdir)/%.dat: %.xml number-regs.xsl sort-regs.xsl gdbserver-regs.xsl FEATURE_XMLFILES = aarch64-core.xml \ aarch64-fpu.xml \ aarch64-pauth.xml \ + aarch64-mte.xml \ arc/v1-core.xml \ arc/v1-aux.xml \ arc/v2-core.xml \ diff --git a/gdb/features/aarch64-mte.c b/gdb/features/aarch64-mte.c new file mode 100644 index 00000000000..883b19cd152 --- /dev/null +++ b/gdb/features/aarch64-mte.c @@ -0,0 +1,14 @@ +/* THIS FILE IS GENERATED. -*- buffer-read-only: t -*- vi:set ro: + Original: aarch64-mte.xml */ + +#include "gdbsupport/tdesc.h" + +static int +create_feature_aarch64_mte (struct target_desc *result, long regnum) +{ + struct tdesc_feature *feature; + + feature = tdesc_create_feature (result, "org.gnu.gdb.aarch64.mte"); + tdesc_create_reg (feature, "tag_ctl", regnum++, 0, "system", 64, "uint64"); + return regnum; +} diff --git a/gdb/features/aarch64-mte.xml b/gdb/features/aarch64-mte.xml new file mode 100644 index 00000000000..da6c7bfd2f6 --- /dev/null +++ b/gdb/features/aarch64-mte.xml @@ -0,0 +1,11 @@ + + + + + + + diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog index 51c059caf08..db906600b28 100644 --- a/gdbserver/ChangeLog +++ b/gdbserver/ChangeLog @@ -1,3 +1,17 @@ +2021-03-24 Luis Machado + + * linux-aarch64-ipa.cc (get_ipa_tdesc): Update call to + aarch64_linux_read_description. + (initialize_low_tracepoint): Likewise. + * linux-aarch64-low.cc (aarch64_target::low_arch_setup): Take MTE flag + into account. + * linux-aarch64-tdesc.cc (tdesc_aarch64_list): Add one more dimension + for MTE. + (aarch64_linux_read_description): Add mte_p parameter and update to + use it. + * linux-aarch64-tdesc.h (aarch64_linux_read_description): Add mte_p + parameter. + 2021-03-24 Luis Machado * linux-aarch64-low.cc: Include arch/aarch64-mte-linux.h. diff --git a/gdbserver/linux-aarch64-ipa.cc b/gdbserver/linux-aarch64-ipa.cc index 24211df5586..ebf017ed114 100644 --- a/gdbserver/linux-aarch64-ipa.cc +++ b/gdbserver/linux-aarch64-ipa.cc @@ -147,12 +147,12 @@ get_raw_reg (const unsigned char *raw_regs, int regnum) /* Return target_desc to use for IPA, given the tdesc index passed by gdbserver. Index is ignored, since we have only one tdesc - at the moment. SVE and pauth not yet supported. */ + at the moment. SVE, pauth and MTE not yet supported. */ const struct target_desc * get_ipa_tdesc (int idx) { - return aarch64_linux_read_description (0, false); + return aarch64_linux_read_description (0, false, false); } /* Allocate buffer for the jump pads. The branch instruction has a reach @@ -204,6 +204,6 @@ alloc_jump_pad_buffer (size_t size) void initialize_low_tracepoint (void) { - /* SVE and pauth not yet supported. */ - aarch64_linux_read_description (0, false); + /* SVE, pauth and MTE not yet supported. */ + aarch64_linux_read_description (0, false, false); } diff --git a/gdbserver/linux-aarch64-low.cc b/gdbserver/linux-aarch64-low.cc index 7d7da87fdc2..14493c1fbe7 100644 --- a/gdbserver/linux-aarch64-low.cc +++ b/gdbserver/linux-aarch64-low.cc @@ -664,9 +664,13 @@ aarch64_target::low_arch_setup () { uint64_t vq = aarch64_sve_get_vq (tid); unsigned long hwcap = linux_get_hwcap (8); + unsigned long hwcap2 = linux_get_hwcap2 (8); bool pauth_p = hwcap & AARCH64_HWCAP_PACA; + /* MTE is AArch64-only. */ + bool mte_p = hwcap2 & HWCAP2_MTE; - current_process ()->tdesc = aarch64_linux_read_description (vq, pauth_p); + current_process ()->tdesc + = aarch64_linux_read_description (vq, pauth_p, mte_p); } else current_process ()->tdesc = aarch32_linux_read_description (); diff --git a/gdbserver/linux-aarch64-tdesc.cc b/gdbserver/linux-aarch64-tdesc.cc index a7f728ecda6..ee005b8ea18 100644 --- a/gdbserver/linux-aarch64-tdesc.cc +++ b/gdbserver/linux-aarch64-tdesc.cc @@ -27,22 +27,22 @@ #include /* All possible aarch64 target descriptors. */ -struct target_desc *tdesc_aarch64_list[AARCH64_MAX_SVE_VQ + 1][2/*pauth*/]; +struct target_desc *tdesc_aarch64_list[AARCH64_MAX_SVE_VQ + 1][2/*pauth*/][2 /* mte */]; /* Create the aarch64 target description. */ const target_desc * -aarch64_linux_read_description (uint64_t vq, bool pauth_p) +aarch64_linux_read_description (uint64_t vq, bool pauth_p, bool mte_p) { if (vq > AARCH64_MAX_SVE_VQ) error (_("VQ is %" PRIu64 ", maximum supported value is %d"), vq, AARCH64_MAX_SVE_VQ); - struct target_desc *tdesc = tdesc_aarch64_list[vq][pauth_p]; + struct target_desc *tdesc = tdesc_aarch64_list[vq][pauth_p][mte_p]; if (tdesc == NULL) { - tdesc = aarch64_create_target_description (vq, pauth_p); + tdesc = aarch64_create_target_description (vq, pauth_p, mte_p); static const char *expedite_regs_aarch64[] = { "x29", "sp", "pc", NULL }; static const char *expedite_regs_aarch64_sve[] = { "x29", "sp", "pc", @@ -53,7 +53,7 @@ aarch64_linux_read_description (uint64_t vq, bool pauth_p) else init_target_desc (tdesc, expedite_regs_aarch64_sve); - tdesc_aarch64_list[vq][pauth_p] = tdesc; + tdesc_aarch64_list[vq][pauth_p][mte_p] = tdesc; } return tdesc; diff --git a/gdbserver/linux-aarch64-tdesc.h b/gdbserver/linux-aarch64-tdesc.h index 95f115c2de9..8319ca7d68b 100644 --- a/gdbserver/linux-aarch64-tdesc.h +++ b/gdbserver/linux-aarch64-tdesc.h @@ -20,6 +20,7 @@ #ifndef GDBSERVER_LINUX_AARCH64_TDESC_H #define GDBSERVER_LINUX_AARCH64_TDESC_H -const target_desc * aarch64_linux_read_description (uint64_t vq, bool pauth_p); +const target_desc * aarch64_linux_read_description (uint64_t vq, bool pauth_p, + bool mte_p); #endif /* GDBSERVER_LINUX_AARCH64_TDESC_H */