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([71.212.131.115]) by smtp.gmail.com with ESMTPSA id j26-20020aa783da000000b00687a4b70d1esm3577320pfn.218.2023.09.15.20.30.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 20:30:47 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Peter Maydell Subject: [PULL 38/39] tcg/aarch64: Emit BTI insns at jump landing pads Date: Fri, 15 Sep 2023 20:30:10 -0700 Message-Id: <20230916033011.479144-39-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230916033011.479144-1-richard.henderson@linaro.org> References: <20230916033011.479144-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::42d; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org The prologue is entered via "call"; the epilogue, each tb, and each goto_tb continuation point are all reached via "jump". As tcg_out_goto_long is only used by tcg_out_exit_tb, merge the two functions. Change the indirect register used to TCG_REG_TMP1, aka X17, so that the BTI condition created is "jump" instead of "jump or call". Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- tcg/aarch64/tcg-target.c.inc | 54 ++++++++++++++++++++++++++---------- 1 file changed, 39 insertions(+), 15 deletions(-) diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc index a0b65029d4..06ea3c7652 100644 --- a/tcg/aarch64/tcg-target.c.inc +++ b/tcg/aarch64/tcg-target.c.inc @@ -602,6 +602,10 @@ typedef enum { DMB_ISH = 0xd50338bf, DMB_LD = 0x00000100, DMB_ST = 0x00000200, + + BTI_C = 0xd503245f, + BTI_J = 0xd503249f, + BTI_JC = 0xd50324df, } AArch64Insn; static inline uint32_t tcg_in32(TCGContext *s) @@ -843,6 +847,17 @@ static void tcg_out_insn_3313(TCGContext *s, AArch64Insn insn, | rn << 5 | (rd & 0x1f)); } +static void tcg_out_bti(TCGContext *s, AArch64Insn insn) +{ + /* + * While BTI insns are nops on hosts without FEAT_BTI, + * there is no point in emitting them in that case either. + */ + if (cpuinfo & CPUINFO_BTI) { + tcg_out32(s, insn); + } +} + /* Register to register move using ORR (shifted register with no shift). */ static void tcg_out_movr(TCGContext *s, TCGType ext, TCGReg rd, TCGReg rm) { @@ -1351,18 +1366,6 @@ static void tcg_out_goto(TCGContext *s, const tcg_insn_unit *target) tcg_out_insn(s, 3206, B, offset); } -static void tcg_out_goto_long(TCGContext *s, const tcg_insn_unit *target) -{ - ptrdiff_t offset = tcg_pcrel_diff(s, target) >> 2; - if (offset == sextract64(offset, 0, 26)) { - tcg_out_insn(s, 3206, B, offset); - } else { - /* Choose X9 as a call-clobbered non-LR temporary. */ - tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X9, (intptr_t)target); - tcg_out_insn(s, 3207, BR, TCG_REG_X9); - } -} - static void tcg_out_call_int(TCGContext *s, const tcg_insn_unit *target) { ptrdiff_t offset = tcg_pcrel_diff(s, target) >> 2; @@ -1947,12 +1950,28 @@ static const tcg_insn_unit *tb_ret_addr; static void tcg_out_exit_tb(TCGContext *s, uintptr_t a0) { + const tcg_insn_unit *target; + ptrdiff_t offset; + /* Reuse the zeroing that exists for goto_ptr. */ if (a0 == 0) { - tcg_out_goto_long(s, tcg_code_gen_epilogue); + target = tcg_code_gen_epilogue; } else { tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0); - tcg_out_goto_long(s, tb_ret_addr); + target = tb_ret_addr; + } + + offset = tcg_pcrel_diff(s, target) >> 2; + if (offset == sextract64(offset, 0, 26)) { + tcg_out_insn(s, 3206, B, offset); + } else { + /* + * Only x16/x17 generate BTI type Jump (2), + * other registers generate BTI type Jump|Call (3). + */ + QEMU_BUILD_BUG_ON(TCG_REG_TMP0 != TCG_REG_X16); + tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_TMP0, (intptr_t)target); + tcg_out_insn(s, 3207, BR, TCG_REG_TMP0); } } @@ -1970,6 +1989,7 @@ static void tcg_out_goto_tb(TCGContext *s, int which) tcg_out32(s, I3206_B); tcg_out_insn(s, 3207, BR, TCG_REG_TMP0); set_jmp_reset_offset(s, which); + tcg_out_bti(s, BTI_J); } void tb_target_set_jmp_target(const TranslationBlock *tb, int n, @@ -3074,6 +3094,8 @@ static void tcg_target_qemu_prologue(TCGContext *s) { TCGReg r; + tcg_out_bti(s, BTI_C); + /* Push (FP, LR) and allocate space for all saved registers. */ tcg_out_insn(s, 3314, STP, TCG_REG_FP, TCG_REG_LR, TCG_REG_SP, -PUSH_SIZE, 1, 1); @@ -3114,10 +3136,12 @@ static void tcg_target_qemu_prologue(TCGContext *s) * and fall through to the rest of the epilogue. */ tcg_code_gen_epilogue = tcg_splitwx_to_rx(s->code_ptr); + tcg_out_bti(s, BTI_J); tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_X0, 0); /* TB epilogue */ tb_ret_addr = tcg_splitwx_to_rx(s->code_ptr); + tcg_out_bti(s, BTI_J); /* Remove TCG locals stack space. */ tcg_out_insn(s, 3401, ADDI, TCG_TYPE_I64, TCG_REG_SP, TCG_REG_SP, @@ -3137,7 +3161,7 @@ static void tcg_target_qemu_prologue(TCGContext *s) static void tcg_out_tb_start(TCGContext *s) { - /* nothing to do */ + tcg_out_bti(s, BTI_J); } static void tcg_out_nop_fill(tcg_insn_unit *p, int count)