From patchwork Fri Feb 28 19:19:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Terekhov, Mikhail via Gdb-patches" X-Patchwork-Id: 38354 Received: (qmail 4043 invoked by alias); 28 Feb 2020 19:19:12 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 4031 invoked by uid 89); 28 Feb 2020 19:19:12 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-21.4 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.1 spammy= X-HELO: mail-pg1-f202.google.com Received: from mail-pg1-f202.google.com (HELO mail-pg1-f202.google.com) (209.85.215.202) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 28 Feb 2020 19:19:10 +0000 Received: by mail-pg1-f202.google.com with SMTP id 71so2322604pgg.23 for ; Fri, 28 Feb 2020 11:19:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=RoOrAzCwJsDrfo/HNlg1FFXICoPGySbQ9CTGXrDatYA=; b=BdnwANaFJXfUo2cQub/nlpVQ5+JhD//2cMXWyIvnuNdss/B27zNPI1oWgW3qTIpmsK TLuQ0ChxN/0BsZNpYUujnXSsf/Q9+YiKDiAUQWyl9D2w5C+z9wsjMmJ8v0upvKcxgRfa 1IJsOo8X5RFBSzJRZMG5V7ODnSa55+51HIAN7SHjMhV46PEnKoEAcCdsEKvx9aK35NWI Zb7sgN2yVeb/QmtF/YrBcMcEixMvDk316RxXfClgsU2q4bBqgujgU4E4VqHTF7mFAGG2 nybHXDGfUpsHTGK5uE1o3wgOjaYkhNZ7ZTmE9x8lA9vJ21wodQtWqmt5vkiWg7DH69f4 rLQQ== Date: Fri, 28 Feb 2020 13:19:05 -0600 In-Reply-To: Message-Id: <20200228191905.30413-1-cbiesinger@google.com> Mime-Version: 1.0 References: Subject: [PATCH v3] Fix arm-netbsd build error: convert from FPA to VFP X-Patchwork-Original-From: "Christian Biesinger via gdb-patches" From: "Terekhov, Mikhail via Gdb-patches" Reply-To: Christian Biesinger To: gdb-patches@sourceware.org Cc: Christian Biesinger X-IsSubscribed: yes Hi Alan, there is already a num_vfp_registers field in tdep, so I thought it easiest to just use that. Does that look good? See below. Thanks, Christian ---- The floating point register interface has changed to this: https://github.com/NetBSD/src/blob/trunk/sys/arch/arm/include/reg.h It now uses VFP instead of FPA registers. This patch updates arm-nbsd-nat.c accordingly. Also implements read_description so that these registers are correctly printed by "info registers" et al. Tested by compiling & running on arm-netbsd on qemu. gdb/ChangeLog: 2020-02-11 Christian Biesinger * arm-nbsd-nat.c (arm_supply_fparegset): Rename to... (arm_supply_vfpregset): ...this, and update to use VFP registers. (fetch_fp_register): Update. (fetch_fp_regs): Update. (store_fp_register): Update. (store_fp_regs): Update. (arm_netbsd_nat_target::read_description): New function. (fetch_elfcore_registers): Update. --- gdb/arm-nbsd-nat.c | 121 +++++++++++++++++++++++++-------------------- 1 file changed, 68 insertions(+), 53 deletions(-) diff --git a/gdb/arm-nbsd-nat.c b/gdb/arm-nbsd-nat.c index 11afc289c3..cee7917db2 100644 --- a/gdb/arm-nbsd-nat.c +++ b/gdb/arm-nbsd-nat.c @@ -26,10 +26,12 @@ #include "target.h" #include #include +#include #include #include #include "arm-tdep.h" +#include "aarch32-tdep.h" #include "inf-ptrace.h" class arm_netbsd_nat_target final : public inf_ptrace_target @@ -38,6 +40,7 @@ public: /* Add our register access methods. */ void fetch_registers (struct regcache *, int) override; void store_registers (struct regcache *, int) override; + const struct target_desc *read_description () override; }; static arm_netbsd_nat_target the_arm_netbsd_nat_target; @@ -65,15 +68,17 @@ arm_supply_gregset (struct regcache *regcache, struct reg *gregset) } static void -arm_supply_fparegset (struct regcache *regcache, struct fpreg *fparegset) +arm_supply_vfpregset (struct regcache *regcache, struct fpreg *fpregset) { - int regno; + struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); + if (tdep->vfp_register_count == 0) + return; - for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) - regcache->raw_supply (regno, - (char *) &fparegset->fpr[regno - ARM_F0_REGNUM]); + struct vfpreg &vfp = fpregset->fpr_vfp; + for (int regno = 0; regno <= tdep->vfp_register_count; regno++) + regcache->raw_supply (regno + ARM_D0_REGNUM, (char *) &vfp.vfp_regs[regno]); - regcache->raw_supply (ARM_FPS_REGNUM, (char *) &fparegset->fpr_fpsr); + regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); } static void @@ -147,10 +152,10 @@ static void fetch_fp_register (struct regcache *regcache, int regno) { struct fpreg inferior_fp_registers; - int ret; + int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), + (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); - ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), - (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); + struct vfpreg &vfp = inferior_fp_registers.fpr_vfp; if (ret < 0) { @@ -158,18 +163,17 @@ fetch_fp_register (struct regcache *regcache, int regno) return; } - switch (regno) + struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); + if (regno == ARM_FPSCR_REGNUM) + regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); + else if (regno >= ARM_D0_REGNUM + && regno <= ARM_D0_REGNUM + tdep->vfp_register_count) { - case ARM_FPS_REGNUM: - regcache->raw_supply (ARM_FPS_REGNUM, - (char *) &inferior_fp_registers.fpr_fpsr); - break; - - default: - regcache->raw_supply - (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]); - break; + regcache->raw_supply (regno, + (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]); } + else + warning (_("Invalid register number.")); } static void @@ -188,7 +192,7 @@ fetch_fp_regs (struct regcache *regcache) return; } - arm_supply_fparegset (regcache, &inferior_fp_registers); + arm_supply_vfpregset (regcache, &inferior_fp_registers); } void @@ -327,10 +331,9 @@ static void store_fp_register (const struct regcache *regcache, int regno) { struct fpreg inferior_fp_registers; - int ret; - - ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), - (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); + int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), + (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); + struct vfpreg &vfp = inferior_fp_registers.fpr_vfp; if (ret < 0) { @@ -338,18 +341,17 @@ store_fp_register (const struct regcache *regcache, int regno) return; } - switch (regno) + struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); + if (regno == ARM_FPSCR_REGNUM) + regcache->raw_collect (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); + else if (regno >= ARM_D0_REGNUM + && regno <= ARM_D0_REGNUM + tdep->vfp_register_count) { - case ARM_FPS_REGNUM: - regcache->raw_collect (ARM_FPS_REGNUM, - (char *) &inferior_fp_registers.fpr_fpsr); - break; - - default: - regcache->raw_collect - (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]); - break; + regcache->raw_collect (regno, + (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]); } + else + warning (_("Invalid register number.")); ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (), (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); @@ -361,20 +363,20 @@ store_fp_register (const struct regcache *regcache, int regno) static void store_fp_regs (const struct regcache *regcache) { - struct fpreg inferior_fp_registers; - int ret; - int regno; - + struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); + if (tdep->vfp_register_count == 0) + return; - for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) + struct fpreg fpregs; + for (int regno = 0; regno <= tdep->vfp_register_count; regno++) regcache->raw_collect - (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]); + (regno + ARM_D0_REGNUM, (char *) &fpregs.fpr_vfp.vfp_regs[regno]); - regcache->raw_collect (ARM_FPS_REGNUM, - (char *) &inferior_fp_registers.fpr_fpsr); + regcache->raw_collect (ARM_FPSCR_REGNUM, + (char *) &fpregs.fpr_vfp.vfp_fpscr); - ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (), - (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0); + int ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (), + (PTRACE_TYPE_ARG3) &fpregs, 0); if (ret < 0) warning (_("unable to store floating-point registers")); @@ -397,6 +399,23 @@ arm_netbsd_nat_target::store_registers (struct regcache *regcache, int regno) } } +const struct target_desc * +arm_netbsd_nat_target::read_description () +{ + int flag; + size_t len = sizeof (flag); + + if (sysctlbyname("machdep.fpu_present", &flag, &len, NULL, 0) != 0 + || !flag) + return arm_read_description (ARM_FP_TYPE_NONE); + + len = sizeof(flag); + if (sysctlbyname("machdep.neon_present", &flag, &len, NULL, 0) == 0 && flag) + return aarch32_read_description (); + + return arm_read_description (ARM_FP_TYPE_VFPV3); +} + static void fetch_elfcore_registers (struct regcache *regcache, gdb_byte *core_reg_sect, unsigned core_reg_size, @@ -420,15 +439,11 @@ fetch_elfcore_registers (struct regcache *regcache, break; case 2: - if (core_reg_size != sizeof (struct fpreg)) - warning (_("wrong size of FPA register set in core file")); - else - { - /* The memcpy may be unnecessary, but we can't really be sure - of the alignment of the data in the core file. */ - memcpy (&fparegset, core_reg_sect, sizeof (fparegset)); - arm_supply_fparegset (regcache, &fparegset); - } + /* cbiesinger/2020-02-12 -- as far as I can tell, ARM/NetBSD does + not write any floating point registers into the core file (tested + with NetBSD 9.1_RC1). When it does, this block will need to read them, + and the arm-netbsd gdbarch will need a core_read_description function + to return the right description for them. */ break; default: