| Message ID | 20230327131218.2721044-3-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/6] target/ppc: Fix width of some 32-bit SPRs | expand |
Nicholas Piggin <npiggin@gmail.com> writes: > powerpc ifetch endianness depends on MSR[LE] so it has to byteswap > after cpu_ldl_code(). This corrects DSISR bits in alignment > interrupts when running in little endian mode. > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Fabiano Rosas <farosas@suse.de>
On 3/27/23 18:42, Nicholas Piggin wrote: > powerpc ifetch endianness depends on MSR[LE] so it has to byteswap > after cpu_ldl_code(). This corrects DSISR bits in alignment > interrupts when running in little endian mode. > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > Reviewed-by: Fabiano Rosas <farosas@suse.de> > --- > Since v1: > - Removed big endian ifdef [Fabiano review] > - Acaually use need_byswap helper. > > target/ppc/excp_helper.c | 20 +++++++++++++++++++- > 1 file changed, 19 insertions(+), 1 deletion(-) > > diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c > index 287659c74d..07729967b5 100644 > --- a/target/ppc/excp_helper.c > +++ b/target/ppc/excp_helper.c > @@ -133,6 +133,24 @@ static void dump_hcall(CPUPPCState *env) > env->nip); > } > > +/* Return true iff byteswap is needed in a scalar memop */ > +static inline bool need_byteswap(CPUArchState *env) > +{ > + /* SOFTMMU builds TARGET_BIG_ENDIAN. Need to swap when MSR[LE] is set */ > + return !!(env->msr & ((target_ulong)1 << MSR_LE)); > +} > + > +static uint32_t ppc_ldl_code(CPUArchState *env, abi_ptr addr) This hunk fails to compile with configure --disable-tcg FAILED: libqemu-ppc64-softmmu.fa.p/target_ppc_excp_helper.c.o cc -m64 -mlittle-endian -Ilibqemu-ppc64-softmmu.fa.p -I. -I.. -Itarget/ppc -I../target/ppc -I../dtc/libfdt -Iqapi -Itrace -Iui -Iui/shader -I/usr/include/pixman-1 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -fdiagnostics-color=auto -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g -fstack-protector-strong -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wundef -Wwrite-strings -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wold-style-declaration -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels -Wexpansion-to-defined -Wimplicit-fallthrough=2 -Wmissing-format-attribute -Wno-missing-include-dirs -Wno-shift-negative-value -Wno-psabi -isystem /home/Shreya/qemu/linux-headers -isystem linux-headers -iquote . -iquote /home/Shreya/qemu -iquote /home/Shreya/qemu/include -pthread -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fno-common -fwrapv -fPIE -isystem../linux-headers -isystemlinux-headers -DNEED_CPU_H '-DCONFIG_TARGET="ppc64-softmmu-config-target.h"' '-DCONFIG_DEVICES="ppc64-softmmu-config-devices.h"' -MD -MQ libqemu-ppc64-softmmu.fa.p/target_ppc_excp_helper.c.o -MF libqemu-ppc64-softmmu.fa.p/target_ppc_excp_helper.c.o.d -o libqemu-ppc64-softmmu.fa.p/target_ppc_excp_helper.c.o -c ../target/ppc/excp_helper.c ../target/ppc/excp_helper.c:143:49: error: unknown type name ‘abi_ptr’; did you mean ‘si_ptr’? 143 | static uint32_t ppc_ldl_code(CPUArchState *env, abi_ptr addr) | ^~~~~~~ | si_ptr ../target/ppc/excp_helper.c: In function ‘powerpc_excp_books’: ../target/ppc/excp_helper.c:1416:16: error: implicit declaration of function ‘ppc_ldl_code’ [-Werror=implicit-function-declaration] 1416 | insn = ppc_ldl_code(env, env->nip); | ^~~~~~~~~~~~ ../target/ppc/excp_helper.c:1416:16: error: nested extern declaration of ‘ppc_ldl_code’ [-Werror=nested-externs] cc1: all warnings being treated as errors > +{ > + uint32_t insn = cpu_ldl_code(env, addr); > + > + if (need_byteswap(env)) { > + insn = bswap32(insn); > + } > + > + return insn; > +} > + > static void ppc_excp_debug_sw_tlb(CPUPPCState *env, int excp) > { > const char *es; > @@ -3097,7 +3115,7 @@ void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr, > > /* Restore state and reload the insn we executed, for filling in DSISR. */ > cpu_restore_state(cs, retaddr); > - insn = cpu_ldl_code(env, env->nip); > + insn = ppc_ldl_code(env, env->nip); > > switch (env->mmu_model) { > case POWERPC_MMU_SOFT_4xx: Thanks Anushree Mathur
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 287659c74d..07729967b5 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -133,6 +133,24 @@ static void dump_hcall(CPUPPCState *env) env->nip); } +/* Return true iff byteswap is needed in a scalar memop */ +static inline bool need_byteswap(CPUArchState *env) +{ + /* SOFTMMU builds TARGET_BIG_ENDIAN. Need to swap when MSR[LE] is set */ + return !!(env->msr & ((target_ulong)1 << MSR_LE)); +} + +static uint32_t ppc_ldl_code(CPUArchState *env, abi_ptr addr) +{ + uint32_t insn = cpu_ldl_code(env, addr); + + if (need_byteswap(env)) { + insn = bswap32(insn); + } + + return insn; +} + static void ppc_excp_debug_sw_tlb(CPUPPCState *env, int excp) { const char *es; @@ -3097,7 +3115,7 @@ void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr, /* Restore state and reload the insn we executed, for filling in DSISR. */ cpu_restore_state(cs, retaddr); - insn = cpu_ldl_code(env, env->nip); + insn = ppc_ldl_code(env, env->nip); switch (env->mmu_model) { case POWERPC_MMU_SOFT_4xx:
powerpc ifetch endianness depends on MSR[LE] so it has to byteswap after cpu_ldl_code(). This corrects DSISR bits in alignment interrupts when running in little endian mode. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- Since v1: - Removed big endian ifdef [Fabiano review] - Acaually use need_byswap helper. target/ppc/excp_helper.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)