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* MIPS: print BadVAddr CP0 register on exceptionDenis Orlov2023-07-271-1/+2
| | | | | | | | | This register contains the failing address on Address Error and some TLB-related exceptions, and is useful for debugging purposes. Signed-off-by: Denis Orlov <denorl2009@gmail.com> Link: https://lore.barebox.org/20230725050618.3451-8-denorl2009@gmail.com Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* MIPS: traps: fix passing wrong sp when returning from exceptionDenis Orlov2023-06-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | This code seems to have been working on 32-bit builds by accident. However it totally broke on 64 bits, resulting in "restoring" some garbage into registers. The reason the code worked on 32 bits is this. When we are entering the barebox_exc_handler() function, we are passing in a register the current stack pointer as an argument (which corresponds to the regs parameter). On o32 ABI the space for arguments passed in registers is reserved on the stack by the caller. So, when we are taking the address of regs in the body of the function, we have to put this argument on the stack, into the first reserved slot. However, this slot is located exactly at the current 'sp' and thus the address of regs happens to be the same as its value! On n64 ABI, however, the arguments passed in registers are saved onto the stack on the callee side, so we end up with the wrong value being used as the stack pointer. Signed-off-by: Denis Orlov <denorl2009@gmail.com> Link: https://lore.barebox.org/20230605202634.42175-14-denorl2009@gmail.com Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* arch: add SPDX-License-Identifier to all .c filesAhmad Fatoum2022-01-051-0/+2
| | | | | | | | | Record GPL-2.0-only as license for all files lacking an explicit license statement. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Link: https://lore.barebox.org/20220103120539.1730644-11-a.fatoum@pengutronix.de Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* MIPS: allow user to pass incorrect address to md commandAntony Pavlov2015-11-111-6/+46
| | | | | | | | | | | | | | | | | | | | | | This commit makes it possible to handle exception on incorrect data access so 'md' command just show 'xxxxxxxx' instead of crashing the system. barebox:/ md -l 0xa0000003+4 a0000003: xxxxxxxx .... Without this commit we will get this barebox:/ md -l 0xa0000003+4 a0000003: Ooops, address error on load or ifetch! ... ### ERROR ### Please RESET the board ### Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* MIPS: traps.c: separate registers print stuff to show_regs()Antony Pavlov2015-11-111-7/+12
| | | | | Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* MIPS: import exception registers saving from linux kernelAntony Pavlov2013-12-041-7/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Checking registers saving: $ make qemu-malta_defconfig $ make ... $ qemu-system-mips -nodefaults -M malta -m 256 \ -nographic -serial stdio -bios ./barebox-flash-image ... barebox:/ md -l 0x03 Ooops, address error on load or ifetch! $ 0 : 00000000 00000000 ffffffff 0000003f $ 4 : 00000000 ffffffff 00000004 00000004 $ 8 : 00000003 a0404d50 00000001 00000002 $12 : a0404d50 0000000a a0840000 00000003 $16 : 00000100 a0404d50 00000100 00000003 $20 : 00000000 a0406cd8 00000000 00000000 $24 : a083b4d8 a083058c $28 : 00000000 a03ffca8 a0406ab0 a0830604 Hi : 00000000 Lo : 00000040 epc : a083056c ra : a0830604 Status: 00000006 Cause : 00000410 Config: 80008482 ### ERROR ### Please RESET the board ### Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* MIPS: add initial exceptions handlingAntony Pavlov2012-07-271-0/+107
Checking exception handling: $ make qemu-malta_defconfig $ make ... $ qemu-system-mips -nodefaults -M malta -m 256 \ -nographic -serial stdio -bios ./barebox.bin ... barebox:/ md -l 0x03 Ooops, address error on load or ifetch! EPC = 0xa082783c CP0_STATUS = 0x00000006 CP0_CAUSE = 0x00000410 CP0_CONFIG = 0x80008482 ### ERROR ### Please RESET the board ### Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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