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Thu, 10 Nov 2022 10:37:50 +0000 Content-Type: multipart/mixed; boundary="===============6210580067139459369==" MIME-Version: 1.0 From: Srinath Parvathaneni To: CC: , Subject: [PATCH][GCC] arm: Add support for new frame unwinding instruction "0xb5". 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charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Hi, This patch adds support for Arm frame unwinding instruction "0xb5" [1]. When an exception is taken and "0xb5" instruction is encounter during runtime stack-unwinding, we use effective vsp as modifier in pointer authentication. On completion of stack unwinding if "0xb5" instruction is not encountered then CFA will be used as modifier in pointer authentication. [1] https://github.com/ARM-software/abi-aa/releases/download/2022Q3/ehabi32.pdf Regression tested on arm-none-eabi target and found no regressions. Ok for master? Regards, Srinath. gcc/ChangeLog: 2022-11-09 Srinath Parvathaneni * libgcc/config/arm/pr-support.c (__gnu_unwind_execute): Decode opcode "0xb5". ############### Attachment also inlined for ease of reply ############### diff --git a/libgcc/config/arm/pr-support.c b/libgcc/config/arm/pr-support.c index e48854587c667a959aa66ccc4982231f63333ecc..73e4942a39b34a83c2da85def6b13e82ec501552 100644 --- a/libgcc/config/arm/pr-support.c +++ b/libgcc/config/arm/pr-support.c @@ -107,7 +107,9 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws) _uw op; int set_pc; int set_pac = 0; + int set_pac_sp = 0; _uw reg; + _uw sp; set_pc = 0; for (;;) @@ -124,10 +126,11 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws) #if defined(TARGET_HAVE_PACBTI) if (set_pac) { - _uw sp; _uw lr; _uw pac; - _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &sp); + if (!set_pac_sp) + _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, + &sp); _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32, &lr); _Unwind_VRS_Get (context, _UVRSC_PAC, R_IP, _UVRSD_UINT32, &pac); @@ -259,7 +262,19 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws) continue; } - if ((op & 0xfc) == 0xb4) /* Obsolete FPA. */ + /* Use current VSP as modifier in PAC validation. */ + if (op == 0xb5) + { + if (set_pac) + _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, + &sp); + else + return _URC_FAILURE; + set_pac_sp = 1; + continue; + } + + if ((op & 0xfd) == 0xb6) /* Obsolete FPA. */ return _URC_FAILURE; /* op & 0xf8 == 0xb8. */ --===============6210580067139459369== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="rb16528.patch" ZGlmZiAtLWdpdCBhL2xpYmdjYy9jb25maWcvYXJtL3ByLXN1cHBvcnQuYyBiL2xpYmdjYy9jb25m aWcvYXJtL3ByLXN1cHBvcnQuYwppbmRleCBlNDg4NTQ1ODdjNjY3YTk1OWFhNjZjY2M0OTgyMjMx ZjYzMzMzZWNjLi43M2U0OTQyYTM5YjM0YTgzYzJkYTg1ZGVmNmIxM2U4MmVjNTAxNTUyIDEwMDY0 NAotLS0gYS9saWJnY2MvY29uZmlnL2FybS9wci1zdXBwb3J0LmMKKysrIGIvbGliZ2NjL2NvbmZp Zy9hcm0vcHItc3VwcG9ydC5jCkBAIC0xMDcsNyArMTA3LDkgQEAgX19nbnVfdW53aW5kX2V4ZWN1 dGUgKF9VbndpbmRfQ29udGV4dCAqIGNvbnRleHQsIF9fZ251X3Vud2luZF9zdGF0ZSAqIHV3cykK ICAgX3V3IG9wOwogICBpbnQgc2V0X3BjOwogICBpbnQgc2V0X3BhYyA9IDA7CisgIGludCBzZXRf cGFjX3NwID0gMDsKICAgX3V3IHJlZzsKKyAgX3V3IHNwOwogCiAgIHNldF9wYyA9IDA7CiAgIGZv ciAoOzspCkBAIC0xMjQsMTAgKzEyNiwxMSBAQCBfX2dudV91bndpbmRfZXhlY3V0ZSAoX1Vud2lu ZF9Db250ZXh0ICogY29udGV4dCwgX19nbnVfdW53aW5kX3N0YXRlICogdXdzKQogI2lmIGRlZmlu ZWQoVEFSR0VUX0hBVkVfUEFDQlRJKQogCSAgaWYgKHNldF9wYWMpCiAJICAgIHsKLQkgICAgICBf dXcgc3A7CiAJICAgICAgX3V3IGxyOwogCSAgICAgIF91dyBwYWM7Ci0JICAgICAgX1Vud2luZF9W UlNfR2V0IChjb250ZXh0LCBfVVZSU0NfQ09SRSwgUl9TUCwgX1VWUlNEX1VJTlQzMiwgJnNwKTsK KwkgICAgICBpZiAoIXNldF9wYWNfc3ApCisJCV9VbndpbmRfVlJTX0dldCAoY29udGV4dCwgX1VW UlNDX0NPUkUsIFJfU1AsIF9VVlJTRF9VSU5UMzIsCisJCQkJICZzcCk7CiAJICAgICAgX1Vud2lu ZF9WUlNfR2V0IChjb250ZXh0LCBfVVZSU0NfQ09SRSwgUl9MUiwgX1VWUlNEX1VJTlQzMiwgJmxy KTsKIAkgICAgICBfVW53aW5kX1ZSU19HZXQgKGNvbnRleHQsIF9VVlJTQ19QQUMsIFJfSVAsCiAJ CQkgICAgICAgX1VWUlNEX1VJTlQzMiwgJnBhYyk7CkBAIC0yNTksNyArMjYyLDE5IEBAIF9fZ251 X3Vud2luZF9leGVjdXRlIChfVW53aW5kX0NvbnRleHQgKiBjb250ZXh0LCBfX2dudV91bndpbmRf c3RhdGUgKiB1d3MpCiAJICAgICAgY29udGludWU7CiAJICAgIH0KIAotCSAgaWYgKChvcCAmIDB4 ZmMpID09IDB4YjQpICAvKiBPYnNvbGV0ZSBGUEEuICAqLworCSAgLyogVXNlIGN1cnJlbnQgVlNQ IGFzIG1vZGlmaWVyIGluIFBBQyB2YWxpZGF0aW9uLiAgKi8KKwkgIGlmIChvcCA9PSAweGI1KQor CSAgICB7CisJICAgICAgaWYgKHNldF9wYWMpCisJCV9VbndpbmRfVlJTX0dldCAoY29udGV4dCwg X1VWUlNDX0NPUkUsIFJfU1AsIF9VVlJTRF9VSU5UMzIsCisJCQkJICZzcCk7CisJICAgICAgZWxz ZQorCQlyZXR1cm4gX1VSQ19GQUlMVVJFOworCSAgICAgIHNldF9wYWNfc3AgPSAxOworCSAgICAg IGNvbnRpbnVlOworCSAgICB9CisKKwkgIGlmICgob3AgJiAweGZkKSA9PSAweGI2KSAgLyogT2Jz b2xldGUgRlBBLiAgKi8KIAkgICAgcmV0dXJuIF9VUkNfRkFJTFVSRTsKIAogCSAgLyogb3AgJiAw eGY4ID09IDB4YjguICAqLwoKCgo= --===============6210580067139459369==--