From 864df2058d01d65244e5f91cdf0c4784df242ca2 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Alex=20Benn=C3=A9e?= Date: Tue, 13 Nov 2018 10:47:59 +0000 Subject: [PATCH] target/arm64: properly handle DBGVR RESS bits MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This only fails with some (broken) versions of gdb but we should treat the top bits of DBGBVR as RESS. Properly sign extend QEMU's reference copy of dbgbvr and also update the register descriptions in the comment. Signed-off-by: Alex Bennée Reviewed-by: Richard Henderson Message-id: 20181109152119.9242-2-alex.bennee@linaro.org Signed-off-by: Peter Maydell --- target/arm/kvm64.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index 5de8ff0ac5..6351a54b28 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -103,7 +103,7 @@ static void kvm_arm_init_debug(CPUState *cs) * capable of fancier matching but that will require exposing that * fanciness to GDB's interface * - * D7.3.2 DBGBCR_EL1, Debug Breakpoint Control Registers + * DBGBCR_EL1, Debug Breakpoint Control Registers * * 31 24 23 20 19 16 15 14 13 12 9 8 5 4 3 2 1 0 * +------+------+-------+-----+----+------+-----+------+-----+---+ @@ -115,12 +115,25 @@ static void kvm_arm_init_debug(CPUState *cs) * SSC/HMC/PMC: Security, Higher and Priv access control (Table D-12) * BAS: Byte Address Select (RES1 for AArch64) * E: Enable bit + * + * DBGBVR_EL1, Debug Breakpoint Value Registers + * + * 63 53 52 49 48 2 1 0 + * +------+-----------+----------+-----+ + * | RESS | VA[52:49] | VA[48:2] | 0 0 | + * +------+-----------+----------+-----+ + * + * Depending on the addressing mode bits the top bits of the register + * are a sign extension of the highest applicable VA bit. Some + * versions of GDB don't do it correctly so we ensure they are correct + * here so future PC comparisons will work properly. */ + static int insert_hw_breakpoint(target_ulong addr) { HWBreakpoint brk = { .bcr = 0x1, /* BCR E=1, enable */ - .bvr = addr + .bvr = sextract64(addr, 0, 53) }; if (cur_hw_bps >= max_hw_bps) { -- 2.11.4.GIT