Code space is not executable in jitless mode. Instead, builtins are compiled into the binary, which is where JSEntryTrampoline should be located.
So it sounds to me like either 1. there's an interesting misconfiguration in your build and you are attempting to jump to the on-heap JSEntryTrampoline code section; or 2. the embedded builtins section of the binary (the .text section on linux) is not executable. To be honest, I'd be surprised by either option but anything is possible. Given the `address = 0xd3886c5721` from your output above, it sounds like option 1. In that case, I would investigate where the call to JSEntry is coming from, and why it doesn't properly jump to the binary-embedded instructions. Perhaps Invoke? https://source.chromium.org/chromium/chromium/src/+/master:v8/src/execution/execution.cc;l=241;drc=df4bfabd8b949084fd3c051e23a42c7a11ea83d4 On Tue, Aug 25, 2020 at 11:37 AM 陆亚涵 <ya...@iscas.ac.cn> wrote: > Hi everyone ~ > > > > I participate in porting v8 into risc-v( > https://github.com/v8-riscv/v8/). > > I encount a error about jitless. If i run a helloworld.js with > '--jitless', it occurs SEGV_ACCERR. > > > > error log: > > *````` > ```````````````````````````````````````````````````````````````````````````` > * > > $ ./d8 ./test.js --jitless > > Warning: unknown flag --enable-slow-asserts. > > Try --help for options Received signal 11 SEGV_ACCERR 003fbfe45780 > > ==== C stack trace =============================== > > [0x002ac3444ea2] > > [0x002ac34455ca] > > 0x003fc1bb0800] > > [0x003fbfe45780] > > [end of stack trace] > > Segmentation fault (core dumped) > > *````` > ```````````````````````````````````````````````````````````````````````````` * > > > > address 003fbfe45780 is a Trampoline of builtin function JSEntryTrampoline > > > > ````` > ```````````````````````````````````````````````````````````````````````````` > > kind = BUILTIN > > name = JSEntryTrampoline > > compiler = unknown > > address = 0xd3886c5721 > > Trampoline (size = 36) > > 0xd3886c5780 0 00000e37 lui t3, 0x0 > > 0xd3886c5784 4 564e0e1b addiw t3, t3, 1380 > > 0xd3886c5788 8 00ce1e13 slli t3, t3, 12 > > 0xd3886c578c c b10e0e13 addi t3, t3, -1264 > > 0xd3886c5790 10 00ce1e13 slli t3, t3, 12 > > 0xd3886c5794 14 503e0e13 addi t3, t3, 1283 > > 0xd3886c5798 18 00ce1e13 slli t3, t3, 12 > > 0xd3886c579c 1c 500e0e13 addi t3, t3, 1280 > > 0xd3886c57a0 20 000e0067 jr t3 > > ````` > ```````````````````````````````````````````````````````````````````````````` > > > > I found these code leading to it: > > > > ``` > > void SetDefaultCodePermissions() { > > if (FLAG_jitless) { > > SetReadable(); > > } else { > > SetReadAndExecutable(); > > } > > } > > ``` > > > > But i don't know how to fix it. > > Thank you. > > > > -- > -- > v8-dev mailing list > v8-dev@googlegroups.com > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-dev+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-dev/5F44DBE3.0458EC.27333%40cstnet.cn > <https://groups.google.com/d/msgid/v8-dev/5F44DBE3.0458EC.27333%40cstnet.cn?utm_medium=email&utm_source=footer> > . > -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CAH3p7oNUEw%2Bz2AokQR_XAWhhSbxEDg%2B6KGesj26%3D1F-weRazCw%40mail.gmail.com.
