)]}' { "commit": "08106042d9f5fdff60c129bf33190639f1a98b2a", "tree": "4921381e92dc6ef37a41a82b82c989f532f435cf", "parents": [ "602707187fa54572a0addd5049d135f20a5b592b" ], "author": { "name": "Andrew Burgess", "email": "aburgess@redhat.com", "time": "Thu May 19 13:20:17 2022 +0100" }, "committer": { "name": "Andrew Burgess", "email": "aburgess@redhat.com", "time": "Thu Jul 21 15:19:42 2022 +0100" }, "message": "gdb: move the type cast into gdbarch_tdep\n\nI built GDB for all targets on a x86-64/GNU-Linux system, and\nthen (accidentally) passed GDB a RISC-V binary, and asked GDB to \"run\"\nthe binary on the native target. I got this error:\n\n (gdb) show architecture\n The target architecture is set to \"auto\" (currently \"i386\").\n (gdb) file /tmp/hello.rv32.exe\n Reading symbols from /tmp/hello.rv32.exe...\n (gdb) show architecture\n The target architecture is set to \"auto\" (currently \"riscv:rv32\").\n (gdb) run\n Starting program: /tmp/hello.rv32.exe\n ../../src/gdb/i387-tdep.c:596: internal-error: i387_supply_fxsave: Assertion `tdep-\u003est0_regnum \u003e\u003d I386_ST0_REGNUM\u0027 failed.\n\nWhat\u0027s going on here is this; initially the architecture is i386, this\nis based on the default architecture, which is set based on the native\ntarget. After loading the RISC-V executable the architecture of the\ncurrent inferior is updated based on the architecture of the\nexecutable.\n\nWhen we \"run\", GDB does a fork \u0026 exec, with the inferior being\ncontrolled through ptrace. GDB sees an initial stop from the inferior\nas soon as the inferior comes to life. In response to this stop GDB\nends up calling save_stop_reason (linux-nat.c), which ends up trying\nto read register from the inferior, to do this we end up calling\ntarget_ops::fetch_registers, which, for the x86-64 native target,\ncalls amd64_linux_nat_target::fetch_registers.\n\nAfter this I eventually end up in i387_supply_fxsave, different x86\nbased targets will end in different functions to fetch registers, but\nit doesn\u0027t really matter which function we end up in, the problem is\nthis line, which is repeated in many places:\n\n i386_gdbarch_tdep *tdep \u003d (i386_gdbarch_tdep *) gdbarch_tdep (arch);\n\nThe problem here is that the ARCH in this line comes from the current\ninferior, which, as we discussed above, will be a RISC-V gdbarch, the\ntdep field will actually be of type riscv_gdbarch_tdep, not\ni386_gdbarch_tdep. After this cast we are relying on undefined\nbehaviour, in my case I happen to trigger an assert, but this might\nnot always be the case.\n\nThe thing I tried that exposed this problem was of course, trying to\nstart an executable of the wrong architecture on a native target. I\ndon\u0027t think that the correct solution for this problem is to detect,\nat the point of cast, that the gdbarch_tdep object is of the wrong\ntype, but, I did wonder, is there a way that we could protect\nourselves from incorrectly casting the gdbarch_tdep object?\n\nI think that there is something we can do here, and this commit is the\nfirst step in that direction, though no actual check is added by this\ncommit.\n\nThis commit can be split into two parts:\n\n (1) In gdbarch.h and arch-utils.c. In these files I have modified\n gdbarch_tdep (the function) so that it now takes a template argument,\n like this:\n\n template\u003ctypename TDepType\u003e\n static inline TDepType *\n gdbarch_tdep (struct gdbarch *gdbarch)\n {\n struct gdbarch_tdep *tdep \u003d gdbarch_tdep_1 (gdbarch);\n return static_cast\u003cTDepType *\u003e (tdep);\n }\n\n After this change we are no better protected, but the cast is now\n done within the gdbarch_tdep function rather than at the call sites,\n this leads to the second, much larger change in this commit,\n\n (2) Everywhere gdbarch_tdep is called, we make changes like this:\n\n - i386_gdbarch_tdep *tdep \u003d (i386_gdbarch_tdep *) gdbarch_tdep (arch);\n + i386_gdbarch_tdep *tdep \u003d gdbarch_tdep\u003ci386_gdbarch_tdep\u003e (arch);\n\nThere should be no functional change after this commit.\n\nIn the next commit I will build on this change to add an assertion in\ngdbarch_tdep that checks we are casting to the correct type.\n", "tree_diff": [ { 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