From: Andreas Arnez Date: Tue, 5 Nov 2013 17:43:50 +0000 (+0100) Subject: S390: Fix TDB regset recognition X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6682d9595ed8d9b9bba5470bfd7fd1ccd378f19a;p=binutils-gdb.git S390: Fix TDB regset recognition When checking for the presence of the TDB regset, the current code interprets ENODATA from PTRACE_GETREGSET as an indication that the TDB regset *could* occur on this system, but the inferior stopped outside a transaction. However, the Linux kernel actually reports ENODATA even on systems without the transactional execution facility. Thus the logic is now changed to check the TE field in the HWCAP as well. This version also checks the existence of the TDB regset -- just to be on the safe side when running on TE-enabled hardware with a kernel that does not offer the TDB regset for some reason. gdb/ * s390-linux-nat.c (s390_read_description): Consider the TE field in the HWCAP for determining 'have_regset_tdb'. gdbserver/ * linux-s390-low.c (HWCAP_S390_TE): New define. (s390_arch_setup): Consider the TE field in the HWCAP for determining 'have_regset_tdb'. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 45f92e8210e..a282b82bb21 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2013-11-06 Andreas Arnez + + * s390-linux-nat.c (s390_read_description): Consider the TE field + in the HWCAP for determining 'have_regset_tdb'. + 2013-11-06 Will Newton PR gdb/12866 diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 4f15cfb2cf6..9d514e5e6aa 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,9 @@ +2013-11-06 Andreas Arnez + + * linux-s390-low.c (HWCAP_S390_TE): New define. + (s390_arch_setup): Consider the TE field in the HWCAP for + determining 'have_regset_tdb'. + 2013-10-16 Sergio Durigan Junior PR gdb/16014 diff --git a/gdb/gdbserver/linux-s390-low.c b/gdb/gdbserver/linux-s390-low.c index a2df03736cf..ae8204bd61e 100644 --- a/gdb/gdbserver/linux-s390-low.c +++ b/gdb/gdbserver/linux-s390-low.c @@ -32,6 +32,10 @@ #define HWCAP_S390_HIGH_GPRS 512 #endif +#ifndef HWCAP_S390_TE +#define HWCAP_S390_TE 1024 +#endif + #ifndef PTRACE_GETREGSET #define PTRACE_GETREGSET 0x4204 #endif @@ -425,23 +429,6 @@ s390_arch_setup (void) = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4); int have_regset_tdb = s390_check_regset (pid, NT_S390_TDB, 256); - /* Update target_regsets according to available register sets. */ - for (regset = s390_regsets; regset->fill_function != NULL; regset++) - if (regset->get_request == PTRACE_GETREGSET) - switch (regset->nt_type) - { - case NT_S390_LAST_BREAK: - regset->size = have_regset_last_break? 8 : 0; - break; - case NT_S390_SYSTEM_CALL: - regset->size = have_regset_system_call? 4 : 0; - break; - case NT_S390_TDB: - regset->size = have_regset_tdb ? 256 : 0; - default: - break; - } - /* Assume 31-bit inferior process. */ if (have_regset_system_call) tdesc = tdesc_s390_linux32v2; @@ -456,15 +443,20 @@ s390_arch_setup (void) { unsigned int pswm; struct regcache *regcache = new_register_cache (tdesc); + fetch_inferior_registers (regcache, find_regno (tdesc, "pswm")); collect_register_by_name (regcache, "pswm", &pswm); free_register_cache (regcache); if (pswm & 1) { + if (have_regset_tdb) + have_regset_tdb = + (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_TE) != 0; + if (have_regset_tdb) tdesc = tdesc_s390x_te_linux64; - if (have_regset_system_call) + else if (have_regset_system_call) tdesc = tdesc_s390x_linux64v2; else if (have_regset_last_break) tdesc = tdesc_s390x_linux64v1; @@ -477,6 +469,8 @@ s390_arch_setup (void) else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS) { have_hwcap_s390_high_gprs = 1; + if (have_regset_tdb) + have_regset_tdb = (s390_get_hwcap (tdesc) & HWCAP_S390_TE) != 0; if (have_regset_tdb) tdesc = tdesc_s390_te_linux64; @@ -489,6 +483,24 @@ s390_arch_setup (void) } } #endif + + /* Update target_regsets according to available register sets. */ + for (regset = s390_regsets; regset->fill_function != NULL; regset++) + if (regset->get_request == PTRACE_GETREGSET) + switch (regset->nt_type) + { + case NT_S390_LAST_BREAK: + regset->size = have_regset_last_break? 8 : 0; + break; + case NT_S390_SYSTEM_CALL: + regset->size = have_regset_system_call? 4 : 0; + break; + case NT_S390_TDB: + regset->size = have_regset_tdb ? 256 : 0; + default: + break; + } + current_process ()->tdesc = tdesc; } diff --git a/gdb/s390-linux-nat.c b/gdb/s390-linux-nat.c index 67f97f9a05b..cf3f7d7c828 100644 --- a/gdb/s390-linux-nat.c +++ b/gdb/s390-linux-nat.c @@ -632,8 +632,6 @@ s390_read_description (struct target_ops *ops) = check_regset (tid, NT_S390_LAST_BREAK, 8); have_regset_system_call = check_regset (tid, NT_S390_SYSTEM_CALL, 4); - have_regset_tdb - = check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset); #ifdef __s390x__ /* If GDB itself is compiled as 64-bit, we are running on a machine in @@ -642,6 +640,9 @@ s390_read_description (struct target_ops *ops) addressing mode, but the kernel supports using 64-bit registers in that mode, report s390 architecture with 64-bit GPRs. */ + have_regset_tdb = (s390_get_hwcap () & HWCAP_S390_TE) ? + check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset) : 0; + if (s390_target_wordsize () == 8) return (have_regset_tdb ? tdesc_s390x_te_linux64 : have_regset_system_call? tdesc_s390x_linux64v2 :