--- **[tickets:#441] arm: invalid register list when attaching in FIQ state** **Status:** new **Milestone:** 0.10.0 **Created:** Sun Nov 17, 2024 01:49 AM UTC by Alexey Karyakin **Last Updated:** Sun Nov 17, 2024 01:49 AM UTC **Owner:** OpenOCD-Gerrit gdb-multiarch 10.1 cannot attach to an arm-v5 target when it's in the FIQ state. The "target.xml" architecture description sent from OpenOCD contains an invalid register list (see below). I did not debug gdb but it apparently expects a certain set of registers https://www.sourceware.org/gdb/current/onlinedocs/gdb.html/ARM-Features.html. At least, R8-R12 are missing from the "org.gnu.gdb.arm.core" feature. The "(r8-r12)fiq" are also duplicated in the "banked" feature. This seems to happen because the register list is created using state-dependent mapping. Note that arm-v7m does not map registers at all, even it has banked MSP/PSP. I believe register mapping is not needed when registers are requested with REG_CLASS_ALL as it's only used by the get_gdb_reg_list_noread() function and there are other comments suggesting REG_CLASS_ALL is not used when reading register values. I drafted a patch https://review.openocd.org/c/openocd/+/8588 that fixes this problem. <?xml version="1.0"?> <!DOCTYPE target SYSTEM "gdb-target.dtd"> <target version="1.0"> <architecture>arm</architecture> <feature name="org.gnu.gdb.arm.core"> <reg name="r0" bitsize="32" regnum="0" save-restore="no" type="uint32" group="general"/> <reg name="r1" bitsize="32" regnum="1" save-restore="no" type="uint32" group="general"/> <reg name="r2" bitsize="32" regnum="2" save-restore="no" type="uint32" group="general"/> <reg name="r3" bitsize="32" regnum="3" save-restore="no" type="uint32" group="general"/> <reg name="r4" bitsize="32" regnum="4" save-restore="no" type="uint32" group="general"/> <reg name="r5" bitsize="32" regnum="5" save-restore="no" type="uint32" group="general"/> <reg name="r6" bitsize="32" regnum="6" save-restore="no" type="uint32" group="general"/> <reg name="r7" bitsize="32" regnum="7" save-restore="no" type="uint32" group="general"/> <reg name="sp" bitsize="32" regnum="13" save-restore="no" type="data_ptr" group="general"/> <reg name="lr" bitsize="32" regnum="14" save-restore="no" type="code_ptr" group="general"/> <reg name="pc" bitsize="32" regnum="15" save-restore="no" type="code_ptr" group="general"/> <reg name="cpsr" bitsize="32" regnum="25" save-restore="no" type="uint32" group="general"/> </feature> <feature name="net.sourceforge.openocd.banked"> <reg name="r8_fiq" bitsize="32" regnum="28" save-restore="no" type="uint32" group="banked"/> <reg name="r9_fiq" bitsize="32" regnum="29" save-restore="no" type="uint32" group="banked"/> <reg name="r10_fiq" bitsize="32" regnum="30" save-restore="no" type="uint32" group="banked"/> <reg name="r11_fiq" bitsize="32" regnum="31" save-restore="no" type="uint32" group="banked"/> <reg name="r12_fiq" bitsize="32" regnum="32" save-restore="no" type="uint32" group="banked"/> <reg name="sp_usr" bitsize="32" regnum="26" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_usr" bitsize="32" regnum="27" save-restore="no" type="code_ptr" group="banked"/> <reg name="r8_fiq" bitsize="32" regnum="28" save-restore="no" type="uint32" group="banked"/> <reg name="r9_fiq" bitsize="32" regnum="29" save-restore="no" type="uint32" group="banked"/> <reg name="r10_fiq" bitsize="32" regnum="30" save-restore="no" type="uint32" group="banked"/> <reg name="r11_fiq" bitsize="32" regnum="31" save-restore="no" type="uint32" group="banked"/> <reg name="r12_fiq" bitsize="32" regnum="32" save-restore="no" type="uint32" group="banked"/> <reg name="sp_fiq" bitsize="32" regnum="33" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_fiq" bitsize="32" regnum="34" save-restore="no" type="code_ptr" group="banked"/> <reg name="sp_irq" bitsize="32" regnum="35" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_irq" bitsize="32" regnum="36" save-restore="no" type="code_ptr" group="banked"/> <reg name="sp_svc" bitsize="32" regnum="37" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_svc" bitsize="32" regnum="38" save-restore="no" type="code_ptr" group="banked"/> <reg name="sp_abt" bitsize="32" regnum="39" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_abt" bitsize="32" regnum="40" save-restore="no" type="code_ptr" group="banked"/> <reg name="sp_und" bitsize="32" regnum="41" save-restore="no" type="data_ptr" group="banked"/> <reg name="lr_und" bitsize="32" regnum="42" save-restore="no" type="code_ptr" group="banked"/> <reg name="spsr_fiq" bitsize="32" regnum="43" save-restore="no" type="uint32" group="banked"/> <reg name="spsr_irq" bitsize="32" regnum="44" save-restore="no" type="uint32" group="banked"/> <reg name="spsr_svc" bitsize="32" regnum="45" save-restore="no" type="uint32" group="banked"/> <reg name="spsr_abt" bitsize="32" regnum="46" save-restore="no" type="uint32" group="banked"/> <reg name="spsr_und" bitsize="32" regnum="47" save-restore="no" type="uint32" group="banked"/> </feature> </target> --- Sent from sourceforge.net because openocd-devel@lists.sourceforge.net is subscribed to https://sourceforge.net/p/openocd/tickets/ To unsubscribe from further messages, a project admin can change settings at https://sourceforge.net/p/openocd/admin/tickets/options. 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