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z127sm22262352pfb.53.2019.05.01.20.47.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 May 2019 20:47:37 -0700 (PDT) To: David Gibson References: <20190501053522.10967-1-sjitindarsingh@gmail.com> <20190501053522.10967-2-sjitindarsingh@gmail.com> <11cb0515-7a96-99af-f33b-c752603a189d@ozlabs.ru> <20190502004346.GC13618@umbus.fritz.box> From: Alexey Kardashevskiy Openpgp: preference=signencrypt Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm 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Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190502004346.GC13618@umbus.fritz.box> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::541 Subject: Re: [Qemu-devel] [PATCH 2/2] ppc: Add dump-stack implementation X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: armbru@redhat.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, Suraj Jitindar Singh , dgilbert@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Message-ID: <20190502034732.GTyA9yJSADPSCHln9vCbprOeyIW21uY2wxbXsEqwOc8@z> On 02/05/2019 10:43, David Gibson wrote: > On Wed, May 01, 2019 at 07:48:48PM +1000, Alexey Kardashevskiy wrote: >> >> >> On 01/05/2019 15:35, Suraj Jitindar Singh wrote: >>> The monitor function dump-stack is used to dump the stack for a cpu. >>> This can be useful for debugging purposes when the stack cannot be >>> dumped by another means. >>> >>> Add a ppc implementation ppc_cpu_dump_stack(). >>> The stack pointer is stored in R1 with the back pointer at offset 0 and >>> the link register at offset 2. >>> Also dump the registers from the stack frame if the marker "regshere" is >>> found. >> >> Is this a Linux only marker? ABI does not mentioned this. >> >>> This only dumps the kernel stack, stopping if a non-kernel address is >>> found in the stack. >> >> Why enforce this limit? > > It's also making a Linux specific assumption about addresses. It does not have to if it used ppc_cpu_get_phys_page_debug(), the only linux specific left is that "regshere" marker, otherwise it could work for AIX or FreeBSD (obviously without the exception frame). > >> >>> >>> Sample output: >>> (qemu) dump-stack >>> sp: 0xc00000007bfc5690 lr: 0xc0000000000974b8 >>> sp: 0xc00000007bfc56f0 lr: 0xc00000000065aab4 >>> sp: 0xc00000007bfc5720 lr: 0xc00000000065ab04 >>> sp: 0xc00000007bfc5740 lr: 0xc0000000000c29b8 >>> sp: 0xc00000007bfc57b0 lr: 0xc0000000000bc9e8 >>> sp: 0xc00000007bfc57e0 lr: 0xc0000000000bd584 >>> sp: 0xc00000007bfc5800 lr: 0xc0000000000bee14 >>> sp: 0xc00000007bfc5ac0 lr: 0xc0000000000c2100 >>> sp: 0xc00000007bfc5c60 lr: 0xc000000000029460 >>> sp: 0xc00000007bfc5ca0 lr: 0xc00000000010b5e8 >>> sp: 0xc00000007bfc5d00 lr: 0xc000000000105f34 >>> trap : 0x0000000000000700 >>> pc : 0xc000000000104490 >>> msr : 0x9000000002843003 >>> lr : 0xc000000000103ffc >>> gpr 0: 0x0000000000000001 >>> gpr 1: 0xc00000005051f530 >>> gpr 2: 0xc000000001088200 >>> gpr 3: 0x0000000000000001 >>> gpr 4: 0xc000000032d60000 >>> gpr 5: 0xc0000000014b8f00 >>> gpr 6: 0x0000000000c835e0 >>> gpr 7: 0x0000000000000000 >>> gpr 8: 0x0000000000000000 >>> gpr 9: 0xc000000032f00000 >>> gpr10: 0x9000000002803033 >>> gpr11: 0xc000000000b60f00 >>> gpr12: 0x0000000000002000 >>> gpr13: 0xc000000001250000 >>> gpr14: 0x0000000000000000 >>> gpr15: 0x0000000000000008 >>> gpr16: 0x0000000000000000 >>> gpr17: 0xc00000000114f790 >>> gpr18: 0x00000000ffffffff >>> gpr19: 0xc00000005051f8e8 >>> gpr20: 0x0000000000000001 >>> gpr21: 0x0000000000000000 >>> gpr22: 0x0000000000000001 >>> gpr23: 0x0000000000000001 >>> gpr24: 0x0000000000000001 >>> gpr25: 0xc0000000014b8f70 >>> gpr26: 0x0000000000000000 >>> gpr27: 0x0000000000000001 >>> gpr28: 0x0000000000000001 >>> gpr29: 0x0000000000000000 >>> gpr30: 0xc0000000014b8f00 >>> gpr31: 0xc0000000014b8f00 >> >> Looks bulky, using the "info registers" format would make sense here. >> >> >>> sp: 0xc00000005051f530 lr: 0x0000000000000000 >>> sp: 0xc00000005051f600 lr: 0xc000000000103ffc >>> sp: 0xc00000005051f670 lr: 0xc0000000000f60a8 >>> sp: 0xc00000005051f850 lr: 0xc0000000000f18c0 >>> sp: 0xc00000005051fa10 lr: 0xc0000000000f5184 >>> sp: 0xc00000005051fae0 lr: 0xc0000000000ddf54 >>> sp: 0xc00000005051fb00 lr: 0xc0000000000dab9c >>> sp: 0xc00000005051fb90 lr: 0xc0000000000cbf88 >>> sp: 0xc00000005051fd00 lr: 0xc0000000003e7480 >>> sp: 0xc00000005051fdb0 lr: 0xc0000000003e7ce4 >>> sp: 0xc00000005051fe00 lr: 0xc0000000003e7d88 >>> sp: 0xc00000005051fe20 lr: 0xc00000000000b3a4 >>> trap : 0x0000000000000c01 >>> pc : 0x00007fffa6c9d8d0 >>> msr : 0x900000000280f033 >>> lr : 0x0000000010090f40 >>> gpr 0: 0x0000000000000036 >>> gpr 1: 0x00007fffa62fdd70 >>> gpr 2: 0x00007fffa6d57300 >>> gpr 3: 0x000000000000000d >>> gpr 4: 0x000000002000ae80 >>> gpr 5: 0x0000000000000000 >>> gpr 6: 0x0000000000000537 >>> gpr 7: 0x0000000000000000 >>> gpr 8: 0x000000000000000d >>> gpr 9: 0x0000000000000000 >>> gpr10: 0x0000000000000000 >>> gpr11: 0x0000000000000000 >>> gpr12: 0x0000000000000000 >>> gpr13: 0x00007fffa6306380 >>> gpr14: 0x0000000000000000 >>> gpr15: 0x0000000000000001 >>> gpr16: 0x0000000039ba6928 >>> gpr17: 0x0000000000000000 >>> gpr18: 0x0000000000000000 >>> gpr19: 0x00007fffa6d702f0 >>> gpr20: 0x00007fffa62fddf0 >>> gpr21: 0x0000000000000080 >>> gpr22: 0x0000000000000004 >>> gpr23: 0x0000000000000000 >>> gpr24: 0x0000000010ac85c0 >>> gpr25: 0x0000000000000008 >>> gpr26: 0x00007fffa62fde10 >>> gpr27: 0x0000000000000000 >>> gpr28: 0x0000000000000002 >>> gpr29: 0x0000000000000000 >>> gpr30: 0x0000000039ba6900 >>> gpr31: 0x0000000010ac85c0 >>> sp: 0x00007fffa62fdd70 >>> >>> Signed-off-by: Suraj Jitindar Singh >>> --- >>> target/ppc/cpu.h | 1 + >>> target/ppc/translate.c | 60 +++++++++++++++++++++++++++++++++++++++++ >>> target/ppc/translate_init.inc.c | 1 + >>> 3 files changed, 62 insertions(+) >>> >>> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h >>> index 5e7cf54b2f..28c4dffca1 100644 >>> --- a/target/ppc/cpu.h >>> +++ b/target/ppc/cpu.h >>> @@ -1284,6 +1284,7 @@ struct PPCVirtualHypervisorClass { >>> void ppc_cpu_do_interrupt(CPUState *cpu); >>> bool ppc_cpu_exec_interrupt(CPUState *cpu, int int_req); >>> void ppc_cpu_dump_state(CPUState *cpu, FILE *f, int flags); >>> +void ppc_cpu_dump_stack(CPUState *cpu, FILE *f); >>> void ppc_cpu_dump_statistics(CPUState *cpu, int flags); >>> hwaddr ppc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); >>> int ppc_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg); >>> diff --git a/target/ppc/translate.c b/target/ppc/translate.c >>> index 8d08625c33..b162998ce7 100644 >>> --- a/target/ppc/translate.c >>> +++ b/target/ppc/translate.c >>> @@ -7705,6 +7705,66 @@ void ppc_cpu_dump_state(CPUState *cs, FILE *f, int flags) >>> #undef RFPL >>> } >>> >>> +struct ppc_pt_regs { >>> + unsigned long gpr[32]; >>> + unsigned long nip; >>> + unsigned long msr; >>> + unsigned long orig_gpr3; >>> + unsigned long ctr; >>> + unsigned long link; >>> + unsigned long xer; >>> + unsigned long ccr; >>> + unsigned long softe; >>> + unsigned long trap; >>> + unsigned long dar; >>> + unsigned long dsisr; >>> + unsigned long result; >>> +}; >>> + >>> +void ppc_cpu_dump_stack(CPUState *cs, FILE *f) >>> +{ >>> +#if defined(TARGET_PPC64) >>> + PowerPCCPU *cpu = POWERPC_CPU(cs); >>> + CPUPPCState *env = &cpu->env; >>> + uint64_t sp, next_sp, lr, buf[4]; >> >> These are hwaddr really. >> >>> + >>> + /* stack pointer stored in r1 */ >>> + sp = env->gpr[1]; >>> + >>> + while (sp && (sp & (0xCUL << 60))) { >>> + uint64_t marker = 0UL; >> >> sp = ppc_cpu_get_phys_page_debug(cs, sp) | (sp & ~TARGET_PAGE_MASK); >> >> and finish the loop when ppc_cpu_get_phys_page_debug returns -1? >> >>> + >>> + /* read and print LR */ >>> + cpu_physical_memory_read(sp & ~(0xCUL << 60), buf, sizeof(*buf) * 4); >> >> and s/ & ~(0xCUL << 60)// >> >>> + next_sp = buf[0]; >>> + lr = buf[2]; >> >> These two need to be converted from guest endian. For a BE guest, I see: >> >> sp: 0x000000007e582ff0 lr: 0xe4e60a00000000c0 >> sp: 0xffffffffffffffff lr: 0x0000600000006000 >> sp: 0x0000600000006000 >> >> >>> + qemu_fprintf(f, "sp: 0x%.16lx lr: 0x%.16lx\n", sp, lr); >> >> HWADDR_PRIx. Or at least PRIx64, otherwise it won't compile on 32bit or >> x86 or somewhere else. >> >> >>> + sp &= ~(0xCUL << 60); >> >> and remove this line. And now you can dump >> >> >> >>> + >>> + /* Does the stackframe contain regs? */ >>> + cpu_physical_memory_read(sp + 96, &marker, sizeof(marker)); >> >> I suspect the marker needs byteswap as well. > > Yeah, best to use the cpu_ldl() etc wrappers if possible, which > include byteswaps. Urgh... except this depends on the cpu mode which > complicates things. > >> >> What is that 96? >> >>> + if (marker == 0x7265677368657265) { /* regshere */ >>> + struct ppc_pt_regs regs; >>> + int i; >>> + >>> + cpu_physical_memory_read(sp + 112, ®s, sizeof(regs)); >> >> and the regs. >> >> What is that 112? >> >> I'd copy from arch/powerpc/include/asm/ptrace.h: >> >> #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ >> #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265) >> >> and whatever that 96 is. >> >> Sadly, scripts/update-linux-headers.sh cannot copy >> arch/powerpc/include/asm/ptrace.h as kernel's "make headers_install" >> does not install it (it installs the "uapi" header which does not have >> these symbols) so you'll have to define them. >> >> >>> + >>> + qemu_fprintf(f, "\ttrap : 0x%.16lx\n", regs.trap); >>> + qemu_fprintf(f, "\tpc : 0x%.16lx\n", regs.nip); >>> + qemu_fprintf(f, "\tmsr : 0x%.16lx\n", regs.msr); >>> + qemu_fprintf(f, "\tlr : 0x%.16lx\n", regs.link); >>> + for (i = 0; i < 32; i++) >>> + qemu_fprintf(f, "\tgpr%2d: 0x%.16lx\n", i, >>> + regs.gpr[i]); >>> + } >>> + >>> + sp = next_sp; >>> + } >>> + >>> + qemu_fprintf(f, "sp: 0x%.16lx\n", sp); >> >> >> and this is "sp: 0x%"HWADDR_PRIx"\n". >> >> >> >>> +#endif >>> +} >>> + >>> void ppc_cpu_dump_statistics(CPUState *cs, int flags) >>> { >>> #if defined(DO_PPC_STATISTICS) >>> diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c >>> index 0394a9ddad..3fd24f85cc 100644 >>> --- a/target/ppc/translate_init.inc.c >>> +++ b/target/ppc/translate_init.inc.c >>> @@ -10587,6 +10587,7 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data) >>> cc->do_interrupt = ppc_cpu_do_interrupt; >>> cc->cpu_exec_interrupt = ppc_cpu_exec_interrupt; >>> cc->dump_state = ppc_cpu_dump_state; >>> + cc->dump_stack = ppc_cpu_dump_stack; >>> cc->dump_statistics = ppc_cpu_dump_statistics; >>> cc->set_pc = ppc_cpu_set_pc; >>> cc->gdb_read_register = ppc_cpu_gdb_read_register; >>> >> > -- Alexey