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target-ppc: Support dump for little endian ppc64 

Fix ppc64 arch specific dump code to support all combinations of little/big
endian hosts/guests. FWIW the current code is broken for altivec registers
when guest and host have a different endianness: these 128-bit registers
are written to guest memory as a two 64-bit entities and we should also swap
them.

Unit testing was done with the following program provided by Tom Musta:

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

int main(int argc, char** argv)
{

__uint128_t v = ((__uint128_t)0x0001020304050607ull << 64) |
0x08090a0b0c0d0e0full;

register void * vptr asm ("r11");
vptr = &v;

for(;;)
asm volatile ("lvx 30,0,11" );
}

When sending SIGABRT to this program and examining the core file, we get:

- ppc64  : 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
- ppc64le: 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00

We expect to find the very same layout in the QEMU dump since they are
real core files. This is what we get:

- ppc64 host, ppc64 guest   : 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
- ppc64 host, ppc64le guest : 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
- x86_64 host, ppc64 guest  : 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
- x86_64 host, ppc64le guest: 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00

We introduce a NoteFuncArg type to avoid adding extra arguments to all note
functions.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
[ rebased on top of current master branch,
  introduced NoteFuncArg,
  use new cpu_to_dump{16,32,64} endian helpers,
  fix altivec support,
  Greg Kurz <gkurz@linux.vnet.ibm.com> ]
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Bharata B Rao 2014-05-19 19:58:35 +02:00 committed by Alexander Graf
parent acb0ef5801
commit 0c967de9c0
1 changed files with 62 additions and 33 deletions
target-ppc
arch_dump.c

95
target-ppc/arch_dump.c
View File

@ -79,94 +79,122 @@ typedef struct noteStruct {
} contents;
} QEMU_PACKED Note;
typedef struct NoteFuncArg {
Note note;
DumpState *state;
} NoteFuncArg;
static void ppc64_write_elf64_prstatus(Note *note, PowerPCCPU *cpu)
static void ppc64_write_elf64_prstatus(NoteFuncArg *arg, PowerPCCPU *cpu)
{
int i;
uint64_t cr;
struct PPC64ElfPrstatus *prstatus;
struct PPC64UserRegStruct *reg;
Note *note = &arg->note;
DumpState *s = arg->state;
note->hdr.n_type = cpu_to_be32(NT_PRSTATUS);
note->hdr.n_type = cpu_to_dump32(s, NT_PRSTATUS);
prstatus = &note->contents.prstatus;
memset(prstatus, 0, sizeof(*prstatus));
reg = &prstatus->pr_reg;
for (i = 0; i < 32; i++) {
reg->gpr[i] = cpu_to_be64(cpu->env.gpr[i]);
reg->gpr[i] = cpu_to_dump64(s, cpu->env.gpr[i]);
}
reg->nip = cpu_to_be64(cpu->env.nip);
reg->msr = cpu_to_be64(cpu->env.msr);
reg->ctr = cpu_to_be64(cpu->env.ctr);
reg->link = cpu_to_be64(cpu->env.lr);
reg->xer = cpu_to_be64(cpu_read_xer(&cpu->env));
reg->nip = cpu_to_dump64(s, cpu->env.nip);
reg->msr = cpu_to_dump64(s, cpu->env.msr);
reg->ctr = cpu_to_dump64(s, cpu->env.ctr);
reg->link = cpu_to_dump64(s, cpu->env.lr);
reg->xer = cpu_to_dump64(s, cpu_read_xer(&cpu->env));
cr = 0;
for (i = 0; i < 8; i++) {
cr |= (cpu->env.crf[i] & 15) << (4 * (7 - i));
}
reg->ccr = cpu_to_be64(cr);
reg->ccr = cpu_to_dump64(s, cr);
}
static void ppc64_write_elf64_fpregset(Note *note, PowerPCCPU *cpu)
static void ppc64_write_elf64_fpregset(NoteFuncArg *arg, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfFpregset *fpregset;
Note *note = &arg->note;
DumpState *s = arg->state;
note->hdr.n_type = cpu_to_be32(NT_PRFPREG);
note->hdr.n_type = cpu_to_dump32(s, NT_PRFPREG);
fpregset = &note->contents.fpregset;
memset(fpregset, 0, sizeof(*fpregset));
for (i = 0; i < 32; i++) {
fpregset->fpr[i] = cpu_to_be64(cpu->env.fpr[i]);
fpregset->fpr[i] = cpu_to_dump64(s, cpu->env.fpr[i]);
}
fpregset->fpscr = cpu_to_be64(cpu->env.fpscr);
fpregset->fpscr = cpu_to_dump64(s, cpu->env.fpscr);
}
static void ppc64_write_elf64_vmxregset(Note *note, PowerPCCPU *cpu)
static void ppc64_write_elf64_vmxregset(NoteFuncArg *arg, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfVmxregset *vmxregset;
Note *note = &arg->note;
DumpState *s = arg->state;
note->hdr.n_type = cpu_to_be32(NT_PPC_VMX);
note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VMX);
vmxregset = &note->contents.vmxregset;
memset(vmxregset, 0, sizeof(*vmxregset));
for (i = 0; i < 32; i++) {
vmxregset->avr[i].u64[0] = cpu_to_be64(cpu->env.avr[i].u64[0]);
vmxregset->avr[i].u64[1] = cpu_to_be64(cpu->env.avr[i].u64[1]);
bool needs_byteswap;
#ifdef HOST_WORDS_BIGENDIAN
needs_byteswap = s->dump_info.d_endian == ELFDATA2LSB;
#else
needs_byteswap = s->dump_info.d_endian == ELFDATA2MSB;
#endif
if (needs_byteswap) {
vmxregset->avr[i].u64[0] = bswap64(cpu->env.avr[i].u64[1]);
vmxregset->avr[i].u64[1] = bswap64(cpu->env.avr[i].u64[0]);
} else {
vmxregset->avr[i].u64[0] = cpu->env.avr[i].u64[0];
vmxregset->avr[i].u64[1] = cpu->env.avr[i].u64[1];
}
}
vmxregset->vscr.u32[3] = cpu_to_be32(cpu->env.vscr);
vmxregset->vscr.u32[3] = cpu_to_dump32(s, cpu->env.vscr);
}
static void ppc64_write_elf64_vsxregset(Note *note, PowerPCCPU *cpu)
static void ppc64_write_elf64_vsxregset(NoteFuncArg *arg, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfVsxregset *vsxregset;
Note *note = &arg->note;
DumpState *s = arg->state;
note->hdr.n_type = cpu_to_be32(NT_PPC_VSX);
note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VSX);
vsxregset = &note->contents.vsxregset;
memset(vsxregset, 0, sizeof(*vsxregset));
for (i = 0; i < 32; i++) {
vsxregset->vsr[i] = cpu_to_be64(cpu->env.vsr[i]);
vsxregset->vsr[i] = cpu_to_dump64(s, cpu->env.vsr[i]);
}
}
static void ppc64_write_elf64_speregset(Note *note, PowerPCCPU *cpu)
static void ppc64_write_elf64_speregset(NoteFuncArg *arg, PowerPCCPU *cpu)
{
struct PPC64ElfSperegset *speregset;
note->hdr.n_type = cpu_to_be32(NT_PPC_SPE);
Note *note = &arg->note;
DumpState *s = arg->state;
note->hdr.n_type = cpu_to_dump32(s, NT_PPC_SPE);
speregset = &note->contents.speregset;
memset(speregset, 0, sizeof(*speregset));
speregset->spe_acc = cpu_to_be64(cpu->env.spe_acc);
speregset->spe_fscr = cpu_to_be32(cpu->env.spe_fscr);
speregset->spe_acc = cpu_to_dump64(s, cpu->env.spe_acc);
speregset->spe_fscr = cpu_to_dump32(s, cpu->env.spe_fscr);
}
static const struct NoteFuncDescStruct {
int contents_size;
void (*note_contents_func)(Note *note, PowerPCCPU *cpu);
void (*note_contents_func)(NoteFuncArg *arg, PowerPCCPU *cpu);
} note_func[] = {
{sizeof(((Note *)0)->contents.prstatus), ppc64_write_elf64_prstatus},
{sizeof(((Note *)0)->contents.fpregset), ppc64_write_elf64_fpregset},
@ -218,20 +246,21 @@ static int ppc64_write_all_elf64_notes(const char *note_name,
PowerPCCPU *cpu, int id,
void *opaque)
{
Note note;
NoteFuncArg arg = { .state = opaque };
int ret = -1;
int note_size;
const NoteFuncDesc *nf;
for (nf = note_func; nf->note_contents_func; nf++) {
note.hdr.n_namesz = cpu_to_be32(sizeof(note.name));
note.hdr.n_descsz = cpu_to_be32(nf->contents_size);
strncpy(note.name, note_name, sizeof(note.name));
arg.note.hdr.n_namesz = cpu_to_dump32(opaque, sizeof(arg.note.name));
arg.note.hdr.n_descsz = cpu_to_dump32(opaque, nf->contents_size);
strncpy(arg.note.name, note_name, sizeof(arg.note.name));
(*nf->note_contents_func)(&note, cpu);
(*nf->note_contents_func)(&arg, cpu);
note_size = sizeof(note) - sizeof(note.contents) + nf->contents_size;
ret = f(&note, note_size, opaque);
note_size =
sizeof(arg.note) - sizeof(arg.note.contents) + nf->contents_size;
ret = f(&arg.note, note_size, opaque);
if (ret < 0) {
return -1;
}