* [Qemu-devel] [PATCH v2 0/2] target/arm: Support EL1 AArch32 guest under AArch64 EL2 @ 2017-02-03 17:48 Peter Maydell 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode Peter Maydell 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts Peter Maydell 0 siblings, 2 replies; 7+ messages in thread From: Peter Maydell @ 2017-02-03 17:48 UTC (permalink / raw) To: qemu-arm, qemu-devel; +Cc: patches, Edgar E. Iglesias Add support for generating the ISS (Instruction Specific Syndrome) for Data Abort exceptions taken from AArch32. These syndromes are used by hypervisors for example to trap and emulate memory accesses. This is a respin of patch 1/3 from the previous series. Changes v1->v2: * other 2 patches are now in QEMU master * split out the "use pbit/wbit variables" change into its own patch * dropped a few stray blank line changes Otherwise unchanged. thanks -- PMM Peter Maydell (2): target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode target/arm: A32, T32: Create Instruction Syndromes for Data Aborts target/arm/translate.c | 207 ++++++++++++++++++++++++++++++++++++------------- 1 file changed, 155 insertions(+), 52 deletions(-) -- 2.7.4 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode 2017-02-03 17:48 [Qemu-devel] [PATCH v2 0/2] target/arm: Support EL1 AArch32 guest under AArch64 EL2 Peter Maydell @ 2017-02-03 17:48 ` Peter Maydell 2017-02-04 14:14 ` Edgar E. Iglesias 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts Peter Maydell 1 sibling, 1 reply; 7+ messages in thread From: Peter Maydell @ 2017-02-03 17:48 UTC (permalink / raw) To: qemu-arm, qemu-devel; +Cc: patches, Edgar E. Iglesias In the ARM ldr/str decode path, rather than directly testing "insn & (1 << 21)" and "insn & (1 << 24)", abstract these bits out into wbit and pbit local flags. (We will want to do more tests against them to determine whether we need to provide syndrome information.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target/arm/translate.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index 493c627..175b4c1 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -8782,6 +8782,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) } else { int address_offset; bool load = insn & (1 << 20); + bool wbit = insn & (1 << 21); + bool pbit = insn & (1 << 24); bool doubleword = false; /* Misc load/store */ rn = (insn >> 16) & 0xf; @@ -8799,8 +8801,9 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) } addr = load_reg(s, rn); - if (insn & (1 << 24)) + if (pbit) { gen_add_datah_offset(s, insn, 0, addr); + } address_offset = 0; if (doubleword) { @@ -8849,10 +8852,10 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) ensure correct behavior with overlapping index registers. ldrd with base writeback is undefined if the destination and index registers overlap. */ - if (!(insn & (1 << 24))) { + if (!pbit) { gen_add_datah_offset(s, insn, address_offset, addr); store_reg(s, rn, addr); - } else if (insn & (1 << 21)) { + } else if (wbit) { if (address_offset) tcg_gen_addi_i32(addr, addr, address_offset); store_reg(s, rn, addr); -- 2.7.4 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode Peter Maydell @ 2017-02-04 14:14 ` Edgar E. Iglesias 0 siblings, 0 replies; 7+ messages in thread From: Edgar E. Iglesias @ 2017-02-04 14:14 UTC (permalink / raw) To: Peter Maydell; +Cc: qemu-arm, qemu-devel, patches On Fri, Feb 03, 2017 at 05:48:54PM +0000, Peter Maydell wrote: > In the ARM ldr/str decode path, rather than directly testing > "insn & (1 << 21)" and "insn & (1 << 24)", abstract these > bits out into wbit and pbit local flags. (We will want to > do more tests against them to determine whether we need to > provide syndrome information.) > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> > --- > target/arm/translate.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/target/arm/translate.c b/target/arm/translate.c > index 493c627..175b4c1 100644 > --- a/target/arm/translate.c > +++ b/target/arm/translate.c > @@ -8782,6 +8782,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > } else { > int address_offset; > bool load = insn & (1 << 20); > + bool wbit = insn & (1 << 21); > + bool pbit = insn & (1 << 24); > bool doubleword = false; > /* Misc load/store */ > rn = (insn >> 16) & 0xf; > @@ -8799,8 +8801,9 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > } > > addr = load_reg(s, rn); > - if (insn & (1 << 24)) > + if (pbit) { > gen_add_datah_offset(s, insn, 0, addr); > + } > address_offset = 0; > > if (doubleword) { > @@ -8849,10 +8852,10 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > ensure correct behavior with overlapping index registers. > ldrd with base writeback is undefined if the > destination and index registers overlap. */ > - if (!(insn & (1 << 24))) { > + if (!pbit) { > gen_add_datah_offset(s, insn, address_offset, addr); > store_reg(s, rn, addr); > - } else if (insn & (1 << 21)) { > + } else if (wbit) { > if (address_offset) > tcg_gen_addi_i32(addr, addr, address_offset); > store_reg(s, rn, addr); > -- > 2.7.4 > ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts 2017-02-03 17:48 [Qemu-devel] [PATCH v2 0/2] target/arm: Support EL1 AArch32 guest under AArch64 EL2 Peter Maydell 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode Peter Maydell @ 2017-02-03 17:48 ` Peter Maydell 2017-02-04 14:31 ` Edgar E. Iglesias 1 sibling, 1 reply; 7+ messages in thread From: Peter Maydell @ 2017-02-03 17:48 UTC (permalink / raw) To: qemu-arm, qemu-devel; +Cc: patches, Edgar E. Iglesias Add support for generating the ISS (Instruction Specific Syndrome) for Data Abort exceptions taken from AArch32. These syndromes are used by hypervisors for example to trap and emulate memory accesses. This is the equivalent for AArch32 guests of the work done for AArch64 guests in commit aaa1f954d4cab243. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target/arm/translate.c | 198 +++++++++++++++++++++++++++++++++++++------------ 1 file changed, 149 insertions(+), 49 deletions(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index 175b4c1..fc0ddcd 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -102,6 +102,63 @@ void arm_translate_init(void) a64_translate_init(); } +static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn) +{ + /* We don't need to save all of the syndrome so we mask and shift + * out uneeded bits to help the sleb128 encoder do a better job. + */ + syn &= ARM_INSN_START_WORD2_MASK; + syn >>= ARM_INSN_START_WORD2_SHIFT; + + /* We check and clear insn_start_idx to catch multiple updates. */ + assert(s->insn_start_idx != 0); + tcg_set_insn_param(s->insn_start_idx, 2, syn); + s->insn_start_idx = 0; +} + +/* Flags for the disas_set_da_iss info argument: + * lower bits hold the Rt register number, higher bits are flags. + */ +typedef enum ISSInfo { + ISSNone = 0, + ISSRegMask = 0x1f, + ISSInvalid = (1 << 5), + ISSIsAcqRel = (1 << 6), + ISSIsWrite = (1 << 7), + ISSIs16Bit = (1 << 8), +} ISSInfo; + +/* Save the syndrome information for a Data Abort */ +static void disas_set_da_iss(DisasContext *s, TCGMemOp memop, ISSInfo issinfo) +{ + uint32_t syn; + int sas = memop & MO_SIZE; + bool sse = memop & MO_SIGN; + bool is_acqrel = issinfo & ISSIsAcqRel; + bool is_write = issinfo & ISSIsWrite; + bool is_16bit = issinfo & ISSIs16Bit; + int srt = issinfo & ISSRegMask; + + if (issinfo & ISSInvalid) { + /* Some callsites want to conditionally provide ISS info, + * eg "only if this was not a writeback" + */ + return; + } + + if (srt == 15) { + /* For AArch32, insns where the src/dest is R15 never generate + * ISS information. Catching that here saves checking at all + * the call sites. + */ + return; + } + + syn = syn_data_abort_with_iss(0, sas, sse, srt, 0, is_acqrel, + 0, 0, 0, is_write, 0, is_16bit); + disas_set_insn_syndrome(s, syn); +} + static inline ARMMMUIdx get_a32_user_mem_index(DisasContext *s) { /* Return the mmu_idx to use for A32/T32 "unprivileged load/store" @@ -933,6 +990,14 @@ static inline void gen_aa32_ld##SUFF(DisasContext *s, TCGv_i32 val, \ TCGv_i32 a32, int index) \ { \ gen_aa32_ld_i32(s, val, a32, index, OPC | s->be_data); \ +} \ +static inline void gen_aa32_ld##SUFF##_iss(DisasContext *s, \ + TCGv_i32 val, \ + TCGv_i32 a32, int index, \ + ISSInfo issinfo) \ +{ \ + gen_aa32_ld_i32(s, val, a32, index, OPC | s->be_data); \ + disas_set_da_iss(s, OPC, issinfo); \ } #define DO_GEN_ST(SUFF, OPC) \ @@ -940,6 +1005,14 @@ static inline void gen_aa32_st##SUFF(DisasContext *s, TCGv_i32 val, \ TCGv_i32 a32, int index) \ { \ gen_aa32_st_i32(s, val, a32, index, OPC | s->be_data); \ +} \ +static inline void gen_aa32_st##SUFF##_iss(DisasContext *s, \ + TCGv_i32 val, \ + TCGv_i32 a32, int index, \ + ISSInfo issinfo) \ +{ \ + gen_aa32_st_i32(s, val, a32, index, OPC | s->be_data); \ + disas_set_da_iss(s, OPC, issinfo | ISSIsWrite); \ } static inline void gen_aa32_frob64(DisasContext *s, TCGv_i64 val) @@ -8682,16 +8755,19 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) tmp = tcg_temp_new_i32(); switch (op1) { case 0: /* lda */ - gen_aa32_ld32u(s, tmp, addr, - get_mem_index(s)); + gen_aa32_ld32u_iss(s, tmp, addr, + get_mem_index(s), + rd | ISSIsAcqRel); break; case 2: /* ldab */ - gen_aa32_ld8u(s, tmp, addr, - get_mem_index(s)); + gen_aa32_ld8u_iss(s, tmp, addr, + get_mem_index(s), + rd | ISSIsAcqRel); break; case 3: /* ldah */ - gen_aa32_ld16u(s, tmp, addr, - get_mem_index(s)); + gen_aa32_ld16u_iss(s, tmp, addr, + get_mem_index(s), + rd | ISSIsAcqRel); break; default: abort(); @@ -8702,16 +8778,19 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) tmp = load_reg(s, rm); switch (op1) { case 0: /* stl */ - gen_aa32_st32(s, tmp, addr, - get_mem_index(s)); + gen_aa32_st32_iss(s, tmp, addr, + get_mem_index(s), + rm | ISSIsAcqRel); break; case 2: /* stlb */ - gen_aa32_st8(s, tmp, addr, - get_mem_index(s)); + gen_aa32_st8_iss(s, tmp, addr, + get_mem_index(s), + rm | ISSIsAcqRel); break; case 3: /* stlh */ - gen_aa32_st16(s, tmp, addr, - get_mem_index(s)); + gen_aa32_st16_iss(s, tmp, addr, + get_mem_index(s), + rm | ISSIsAcqRel); break; default: abort(); @@ -8785,10 +8864,15 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) bool wbit = insn & (1 << 21); bool pbit = insn & (1 << 24); bool doubleword = false; + ISSInfo issinfo; + /* Misc load/store */ rn = (insn >> 16) & 0xf; rd = (insn >> 12) & 0xf; + /* ISS not valid if writeback */ + issinfo = (pbit & !wbit) ? rd : ISSInvalid; + if (!load && (sh & 2)) { /* doubleword */ ARCH(5TE); @@ -8832,20 +8916,23 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) tmp = tcg_temp_new_i32(); switch (sh) { case 1: - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), + issinfo); break; case 2: - gen_aa32_ld8s(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld8s_iss(s, tmp, addr, get_mem_index(s), + issinfo); break; default: case 3: - gen_aa32_ld16s(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16s_iss(s, tmp, addr, get_mem_index(s), + issinfo); break; } } else { /* store */ tmp = load_reg(s, rd); - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), issinfo); tcg_temp_free_i32(tmp); } /* Perform base writeback before the loaded value to @@ -9198,17 +9285,17 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) /* load */ tmp = tcg_temp_new_i32(); if (insn & (1 << 22)) { - gen_aa32_ld8u(s, tmp, tmp2, i); + gen_aa32_ld8u_iss(s, tmp, tmp2, i, rd); } else { - gen_aa32_ld32u(s, tmp, tmp2, i); + gen_aa32_ld32u_iss(s, tmp, tmp2, i, rd); } } else { /* store */ tmp = load_reg(s, rd); if (insn & (1 << 22)) { - gen_aa32_st8(s, tmp, tmp2, i); + gen_aa32_st8_iss(s, tmp, tmp2, i, rd); } else { - gen_aa32_st32(s, tmp, tmp2, i); + gen_aa32_st32_iss(s, tmp, tmp2, i, rd); } tcg_temp_free_i32(tmp); } @@ -9669,13 +9756,16 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw tmp = tcg_temp_new_i32(); switch (op) { case 0: /* ldab */ - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; case 1: /* ldah */ - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; case 2: /* lda */ - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; default: abort(); @@ -9685,13 +9775,16 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw tmp = load_reg(s, rs); switch (op) { case 0: /* stlb */ - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; case 1: /* stlh */ - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; case 2: /* stl */ - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), + rs | ISSIsAcqRel); break; default: abort(); @@ -10637,6 +10730,8 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw int postinc = 0; int writeback = 0; int memidx; + ISSInfo issinfo; + if ((insn & 0x01100000) == 0x01000000) { if (disas_neon_ls_insn(s, insn)) { goto illegal_op; @@ -10740,24 +10835,27 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw } } } + + issinfo = writeback ? ISSInvalid : rs; + if (insn & (1 << 20)) { /* Load. */ tmp = tcg_temp_new_i32(); switch (op) { case 0: - gen_aa32_ld8u(s, tmp, addr, memidx); + gen_aa32_ld8u_iss(s, tmp, addr, memidx, issinfo); break; case 4: - gen_aa32_ld8s(s, tmp, addr, memidx); + gen_aa32_ld8s_iss(s, tmp, addr, memidx, issinfo); break; case 1: - gen_aa32_ld16u(s, tmp, addr, memidx); + gen_aa32_ld16u_iss(s, tmp, addr, memidx, issinfo); break; case 5: - gen_aa32_ld16s(s, tmp, addr, memidx); + gen_aa32_ld16s_iss(s, tmp, addr, memidx, issinfo); break; case 2: - gen_aa32_ld32u(s, tmp, addr, memidx); + gen_aa32_ld32u_iss(s, tmp, addr, memidx, issinfo); break; default: tcg_temp_free_i32(tmp); @@ -10774,13 +10872,13 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw tmp = load_reg(s, rs); switch (op) { case 0: - gen_aa32_st8(s, tmp, addr, memidx); + gen_aa32_st8_iss(s, tmp, addr, memidx, issinfo); break; case 1: - gen_aa32_st16(s, tmp, addr, memidx); + gen_aa32_st16_iss(s, tmp, addr, memidx, issinfo); break; case 2: - gen_aa32_st32(s, tmp, addr, memidx); + gen_aa32_st32_iss(s, tmp, addr, memidx, issinfo); break; default: tcg_temp_free_i32(tmp); @@ -10917,7 +11015,8 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) addr = tcg_temp_new_i32(); tcg_gen_movi_i32(addr, val); tmp = tcg_temp_new_i32(); - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), + rd | ISSIs16Bit); tcg_temp_free_i32(addr); store_reg(s, rd, tmp); break; @@ -11120,28 +11219,28 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) switch (op) { case 0: /* str */ - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 1: /* strh */ - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 2: /* strb */ - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 3: /* ldrsb */ - gen_aa32_ld8s(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld8s_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 4: /* ldr */ - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 5: /* ldrh */ - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 6: /* ldrb */ - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; case 7: /* ldrsh */ - gen_aa32_ld16s(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16s_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); break; } if (op >= 3) { /* load */ @@ -11185,12 +11284,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) if (insn & (1 << 11)) { /* load */ tmp = tcg_temp_new_i32(); - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); store_reg(s, rd, tmp); } else { /* store */ tmp = load_reg(s, rd); - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); tcg_temp_free_i32(tmp); } tcg_temp_free_i32(addr); @@ -11207,12 +11306,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) if (insn & (1 << 11)) { /* load */ tmp = tcg_temp_new_i32(); - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); store_reg(s, rd, tmp); } else { /* store */ tmp = load_reg(s, rd); - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); tcg_temp_free_i32(tmp); } tcg_temp_free_i32(addr); @@ -11228,12 +11327,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) if (insn & (1 << 11)) { /* load */ tmp = tcg_temp_new_i32(); - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); store_reg(s, rd, tmp); } else { /* store */ tmp = load_reg(s, rd); - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); tcg_temp_free_i32(tmp); } tcg_temp_free_i32(addr); @@ -11715,6 +11814,7 @@ void gen_intermediate_code(CPUARMState *env, TranslationBlock *tb) store_cpu_field(tmp, condexec_bits); } do { + dc->insn_start_idx = tcg_op_buf_count(); tcg_gen_insn_start(dc->pc, (dc->condexec_cond << 4) | (dc->condexec_mask >> 1), 0); -- 2.7.4 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts Peter Maydell @ 2017-02-04 14:31 ` Edgar E. Iglesias 2017-02-06 14:53 ` Peter Maydell 0 siblings, 1 reply; 7+ messages in thread From: Edgar E. Iglesias @ 2017-02-04 14:31 UTC (permalink / raw) To: Peter Maydell; +Cc: qemu-arm, qemu-devel, patches On Fri, Feb 03, 2017 at 05:48:55PM +0000, Peter Maydell wrote: > Add support for generating the ISS (Instruction Specific Syndrome) > for Data Abort exceptions taken from AArch32. These syndromes are > used by hypervisors for example to trap and emulate memory accesses. > > This is the equivalent for AArch32 guests of the work done for AArch64 > guests in commit aaa1f954d4cab243. Hi Peter, > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> > --- > target/arm/translate.c | 198 +++++++++++++++++++++++++++++++++++++------------ > 1 file changed, 149 insertions(+), 49 deletions(-) > > diff --git a/target/arm/translate.c b/target/arm/translate.c > index 175b4c1..fc0ddcd 100644 > --- a/target/arm/translate.c > +++ b/target/arm/translate.c > @@ -102,6 +102,63 @@ void arm_translate_init(void) > a64_translate_init(); > } > > +static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn) > +{ > + /* We don't need to save all of the syndrome so we mask and shift > + * out uneeded bits to help the sleb128 encoder do a better job. > + */ > + syn &= ARM_INSN_START_WORD2_MASK; > + syn >>= ARM_INSN_START_WORD2_SHIFT; > + > + /* We check and clear insn_start_idx to catch multiple updates. */ > + assert(s->insn_start_idx != 0); > + tcg_set_insn_param(s->insn_start_idx, 2, syn); > + s->insn_start_idx = 0; > +} Could we move this into translate.h and share it with translate-a64.c? Other than that this looks good to me! Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Thanks, Edgar > + > +/* Flags for the disas_set_da_iss info argument: > + * lower bits hold the Rt register number, higher bits are flags. > + */ > +typedef enum ISSInfo { > + ISSNone = 0, > + ISSRegMask = 0x1f, > + ISSInvalid = (1 << 5), > + ISSIsAcqRel = (1 << 6), > + ISSIsWrite = (1 << 7), > + ISSIs16Bit = (1 << 8), > +} ISSInfo; > + > +/* Save the syndrome information for a Data Abort */ > +static void disas_set_da_iss(DisasContext *s, TCGMemOp memop, ISSInfo issinfo) > +{ > + uint32_t syn; > + int sas = memop & MO_SIZE; > + bool sse = memop & MO_SIGN; > + bool is_acqrel = issinfo & ISSIsAcqRel; > + bool is_write = issinfo & ISSIsWrite; > + bool is_16bit = issinfo & ISSIs16Bit; > + int srt = issinfo & ISSRegMask; > + > + if (issinfo & ISSInvalid) { > + /* Some callsites want to conditionally provide ISS info, > + * eg "only if this was not a writeback" > + */ > + return; > + } > + > + if (srt == 15) { > + /* For AArch32, insns where the src/dest is R15 never generate > + * ISS information. Catching that here saves checking at all > + * the call sites. > + */ > + return; > + } > + > + syn = syn_data_abort_with_iss(0, sas, sse, srt, 0, is_acqrel, > + 0, 0, 0, is_write, 0, is_16bit); > + disas_set_insn_syndrome(s, syn); > +} > + > static inline ARMMMUIdx get_a32_user_mem_index(DisasContext *s) > { > /* Return the mmu_idx to use for A32/T32 "unprivileged load/store" > @@ -933,6 +990,14 @@ static inline void gen_aa32_ld##SUFF(DisasContext *s, TCGv_i32 val, \ > TCGv_i32 a32, int index) \ > { \ > gen_aa32_ld_i32(s, val, a32, index, OPC | s->be_data); \ > +} \ > +static inline void gen_aa32_ld##SUFF##_iss(DisasContext *s, \ > + TCGv_i32 val, \ > + TCGv_i32 a32, int index, \ > + ISSInfo issinfo) \ > +{ \ > + gen_aa32_ld_i32(s, val, a32, index, OPC | s->be_data); \ > + disas_set_da_iss(s, OPC, issinfo); \ > } > > #define DO_GEN_ST(SUFF, OPC) \ > @@ -940,6 +1005,14 @@ static inline void gen_aa32_st##SUFF(DisasContext *s, TCGv_i32 val, \ > TCGv_i32 a32, int index) \ > { \ > gen_aa32_st_i32(s, val, a32, index, OPC | s->be_data); \ > +} \ > +static inline void gen_aa32_st##SUFF##_iss(DisasContext *s, \ > + TCGv_i32 val, \ > + TCGv_i32 a32, int index, \ > + ISSInfo issinfo) \ > +{ \ > + gen_aa32_st_i32(s, val, a32, index, OPC | s->be_data); \ > + disas_set_da_iss(s, OPC, issinfo | ISSIsWrite); \ > } > > static inline void gen_aa32_frob64(DisasContext *s, TCGv_i64 val) > @@ -8682,16 +8755,19 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > tmp = tcg_temp_new_i32(); > switch (op1) { > case 0: /* lda */ > - gen_aa32_ld32u(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_ld32u_iss(s, tmp, addr, > + get_mem_index(s), > + rd | ISSIsAcqRel); > break; > case 2: /* ldab */ > - gen_aa32_ld8u(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_ld8u_iss(s, tmp, addr, > + get_mem_index(s), > + rd | ISSIsAcqRel); > break; > case 3: /* ldah */ > - gen_aa32_ld16u(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_ld16u_iss(s, tmp, addr, > + get_mem_index(s), > + rd | ISSIsAcqRel); > break; > default: > abort(); > @@ -8702,16 +8778,19 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > tmp = load_reg(s, rm); > switch (op1) { > case 0: /* stl */ > - gen_aa32_st32(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_st32_iss(s, tmp, addr, > + get_mem_index(s), > + rm | ISSIsAcqRel); > break; > case 2: /* stlb */ > - gen_aa32_st8(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_st8_iss(s, tmp, addr, > + get_mem_index(s), > + rm | ISSIsAcqRel); > break; > case 3: /* stlh */ > - gen_aa32_st16(s, tmp, addr, > - get_mem_index(s)); > + gen_aa32_st16_iss(s, tmp, addr, > + get_mem_index(s), > + rm | ISSIsAcqRel); > break; > default: > abort(); > @@ -8785,10 +8864,15 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > bool wbit = insn & (1 << 21); > bool pbit = insn & (1 << 24); > bool doubleword = false; > + ISSInfo issinfo; > + > /* Misc load/store */ > rn = (insn >> 16) & 0xf; > rd = (insn >> 12) & 0xf; > > + /* ISS not valid if writeback */ > + issinfo = (pbit & !wbit) ? rd : ISSInvalid; > + > if (!load && (sh & 2)) { > /* doubleword */ > ARCH(5TE); > @@ -8832,20 +8916,23 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > tmp = tcg_temp_new_i32(); > switch (sh) { > case 1: > - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), > + issinfo); > break; > case 2: > - gen_aa32_ld8s(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld8s_iss(s, tmp, addr, get_mem_index(s), > + issinfo); > break; > default: > case 3: > - gen_aa32_ld16s(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16s_iss(s, tmp, addr, get_mem_index(s), > + issinfo); > break; > } > } else { > /* store */ > tmp = load_reg(s, rd); > - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), issinfo); > tcg_temp_free_i32(tmp); > } > /* Perform base writeback before the loaded value to > @@ -9198,17 +9285,17 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) > /* load */ > tmp = tcg_temp_new_i32(); > if (insn & (1 << 22)) { > - gen_aa32_ld8u(s, tmp, tmp2, i); > + gen_aa32_ld8u_iss(s, tmp, tmp2, i, rd); > } else { > - gen_aa32_ld32u(s, tmp, tmp2, i); > + gen_aa32_ld32u_iss(s, tmp, tmp2, i, rd); > } > } else { > /* store */ > tmp = load_reg(s, rd); > if (insn & (1 << 22)) { > - gen_aa32_st8(s, tmp, tmp2, i); > + gen_aa32_st8_iss(s, tmp, tmp2, i, rd); > } else { > - gen_aa32_st32(s, tmp, tmp2, i); > + gen_aa32_st32_iss(s, tmp, tmp2, i, rd); > } > tcg_temp_free_i32(tmp); > } > @@ -9669,13 +9756,16 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw > tmp = tcg_temp_new_i32(); > switch (op) { > case 0: /* ldab */ > - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > case 1: /* ldah */ > - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > case 2: /* lda */ > - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > default: > abort(); > @@ -9685,13 +9775,16 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw > tmp = load_reg(s, rs); > switch (op) { > case 0: /* stlb */ > - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > case 1: /* stlh */ > - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > case 2: /* stl */ > - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), > + rs | ISSIsAcqRel); > break; > default: > abort(); > @@ -10637,6 +10730,8 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw > int postinc = 0; > int writeback = 0; > int memidx; > + ISSInfo issinfo; > + > if ((insn & 0x01100000) == 0x01000000) { > if (disas_neon_ls_insn(s, insn)) { > goto illegal_op; > @@ -10740,24 +10835,27 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw > } > } > } > + > + issinfo = writeback ? ISSInvalid : rs; > + > if (insn & (1 << 20)) { > /* Load. */ > tmp = tcg_temp_new_i32(); > switch (op) { > case 0: > - gen_aa32_ld8u(s, tmp, addr, memidx); > + gen_aa32_ld8u_iss(s, tmp, addr, memidx, issinfo); > break; > case 4: > - gen_aa32_ld8s(s, tmp, addr, memidx); > + gen_aa32_ld8s_iss(s, tmp, addr, memidx, issinfo); > break; > case 1: > - gen_aa32_ld16u(s, tmp, addr, memidx); > + gen_aa32_ld16u_iss(s, tmp, addr, memidx, issinfo); > break; > case 5: > - gen_aa32_ld16s(s, tmp, addr, memidx); > + gen_aa32_ld16s_iss(s, tmp, addr, memidx, issinfo); > break; > case 2: > - gen_aa32_ld32u(s, tmp, addr, memidx); > + gen_aa32_ld32u_iss(s, tmp, addr, memidx, issinfo); > break; > default: > tcg_temp_free_i32(tmp); > @@ -10774,13 +10872,13 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw > tmp = load_reg(s, rs); > switch (op) { > case 0: > - gen_aa32_st8(s, tmp, addr, memidx); > + gen_aa32_st8_iss(s, tmp, addr, memidx, issinfo); > break; > case 1: > - gen_aa32_st16(s, tmp, addr, memidx); > + gen_aa32_st16_iss(s, tmp, addr, memidx, issinfo); > break; > case 2: > - gen_aa32_st32(s, tmp, addr, memidx); > + gen_aa32_st32_iss(s, tmp, addr, memidx, issinfo); > break; > default: > tcg_temp_free_i32(tmp); > @@ -10917,7 +11015,8 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) > addr = tcg_temp_new_i32(); > tcg_gen_movi_i32(addr, val); > tmp = tcg_temp_new_i32(); > - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), > + rd | ISSIs16Bit); > tcg_temp_free_i32(addr); > store_reg(s, rd, tmp); > break; > @@ -11120,28 +11219,28 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) > > switch (op) { > case 0: /* str */ > - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 1: /* strh */ > - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 2: /* strb */ > - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 3: /* ldrsb */ > - gen_aa32_ld8s(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld8s_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 4: /* ldr */ > - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 5: /* ldrh */ > - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 6: /* ldrb */ > - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > case 7: /* ldrsh */ > - gen_aa32_ld16s(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16s_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > break; > } > if (op >= 3) { /* load */ > @@ -11185,12 +11284,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) > if (insn & (1 << 11)) { > /* load */ > tmp = tcg_temp_new_i32(); > - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > store_reg(s, rd, tmp); > } else { > /* store */ > tmp = load_reg(s, rd); > - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > tcg_temp_free_i32(tmp); > } > tcg_temp_free_i32(addr); > @@ -11207,12 +11306,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) > if (insn & (1 << 11)) { > /* load */ > tmp = tcg_temp_new_i32(); > - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > store_reg(s, rd, tmp); > } else { > /* store */ > tmp = load_reg(s, rd); > - gen_aa32_st16(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > tcg_temp_free_i32(tmp); > } > tcg_temp_free_i32(addr); > @@ -11228,12 +11327,12 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) > if (insn & (1 << 11)) { > /* load */ > tmp = tcg_temp_new_i32(); > - gen_aa32_ld32u(s, tmp, addr, get_mem_index(s)); > + gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > store_reg(s, rd, tmp); > } else { > /* store */ > tmp = load_reg(s, rd); > - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); > + gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s), rd | ISSIs16Bit); > tcg_temp_free_i32(tmp); > } > tcg_temp_free_i32(addr); > @@ -11715,6 +11814,7 @@ void gen_intermediate_code(CPUARMState *env, TranslationBlock *tb) > store_cpu_field(tmp, condexec_bits); > } > do { > + dc->insn_start_idx = tcg_op_buf_count(); > tcg_gen_insn_start(dc->pc, > (dc->condexec_cond << 4) | (dc->condexec_mask >> 1), > 0); > -- > 2.7.4 > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts 2017-02-04 14:31 ` Edgar E. Iglesias @ 2017-02-06 14:53 ` Peter Maydell 2017-02-06 15:06 ` Edgar E. Iglesias 0 siblings, 1 reply; 7+ messages in thread From: Peter Maydell @ 2017-02-06 14:53 UTC (permalink / raw) To: Edgar E. Iglesias; +Cc: qemu-arm, QEMU Developers, patches On 4 February 2017 at 14:31, Edgar E. Iglesias <edgar.iglesias@gmail.com> wrote: > On Fri, Feb 03, 2017 at 05:48:55PM +0000, Peter Maydell wrote: >> Add support for generating the ISS (Instruction Specific Syndrome) >> for Data Abort exceptions taken from AArch32. These syndromes are >> used by hypervisors for example to trap and emulate memory accesses. >> >> This is the equivalent for AArch32 guests of the work done for AArch64 >> guests in commit aaa1f954d4cab243. >> +static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn) >> +{ >> + /* We don't need to save all of the syndrome so we mask and shift >> + * out uneeded bits to help the sleb128 encoder do a better job. >> + */ >> + syn &= ARM_INSN_START_WORD2_MASK; >> + syn >>= ARM_INSN_START_WORD2_SHIFT; >> + >> + /* We check and clear insn_start_idx to catch multiple updates. */ >> + assert(s->insn_start_idx != 0); >> + tcg_set_insn_param(s->insn_start_idx, 2, syn); >> + s->insn_start_idx = 0; >> +} > > Could we move this into translate.h and share it with translate-a64.c? Sure; I'll just squash that change into this patch and put the results into the target-arm queue, rather than burdening the list with a v3 respin, if that's OK. thanks -- PMM ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts 2017-02-06 14:53 ` Peter Maydell @ 2017-02-06 15:06 ` Edgar E. Iglesias 0 siblings, 0 replies; 7+ messages in thread From: Edgar E. Iglesias @ 2017-02-06 15:06 UTC (permalink / raw) To: Peter Maydell; +Cc: qemu-arm, QEMU Developers, patches On Mon, Feb 06, 2017 at 02:53:49PM +0000, Peter Maydell wrote: > On 4 February 2017 at 14:31, Edgar E. Iglesias <edgar.iglesias@gmail.com> wrote: > > On Fri, Feb 03, 2017 at 05:48:55PM +0000, Peter Maydell wrote: > >> Add support for generating the ISS (Instruction Specific Syndrome) > >> for Data Abort exceptions taken from AArch32. These syndromes are > >> used by hypervisors for example to trap and emulate memory accesses. > >> > >> This is the equivalent for AArch32 guests of the work done for AArch64 > >> guests in commit aaa1f954d4cab243. > > >> +static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn) > >> +{ > >> + /* We don't need to save all of the syndrome so we mask and shift > >> + * out uneeded bits to help the sleb128 encoder do a better job. > >> + */ > >> + syn &= ARM_INSN_START_WORD2_MASK; > >> + syn >>= ARM_INSN_START_WORD2_SHIFT; > >> + > >> + /* We check and clear insn_start_idx to catch multiple updates. */ > >> + assert(s->insn_start_idx != 0); > >> + tcg_set_insn_param(s->insn_start_idx, 2, syn); > >> + s->insn_start_idx = 0; > >> +} > > > > Could we move this into translate.h and share it with translate-a64.c? > > Sure; I'll just squash that change into this patch and put the > results into the target-arm queue, rather than burdening the > list with a v3 respin, if that's OK. Sounds good, thanks! Cheers, Edgar ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-02-06 15:06 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2017-02-03 17:48 [Qemu-devel] [PATCH v2 0/2] target/arm: Support EL1 AArch32 guest under AArch64 EL2 Peter Maydell 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 1/2] target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode Peter Maydell 2017-02-04 14:14 ` Edgar E. Iglesias 2017-02-03 17:48 ` [Qemu-devel] [PATCH v2 2/2] target/arm: A32, T32: Create Instruction Syndromes for Data Aborts Peter Maydell 2017-02-04 14:31 ` Edgar E. Iglesias 2017-02-06 14:53 ` Peter Maydell 2017-02-06 15:06 ` Edgar E. Iglesias
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