Hi, All.
This series adds save/restore sigcontext.
We use extctx_flags to choces which sigcontext need save/restore.
The extctx_flags default value is EXTCTX_FLAGS_FPU, we need
save/restore fpu context.
After a LSX/LASX instruction is execed, extctx_flags value change to
EXTCTX_FLAGS_LSX/LASX, we always need save/restore lsx/lasx context.
The test_signal.c is a simple test.
The default vreg len is 64. After execed a LSX instruction, the vreg len is
128, and then we exec a FPU instruction, the vreg len is also 128. After
execed a LASX instruction, the vreg len is 256, and then we exec a FPU
instruction, the vreg len is also 256.
test_signal.c:
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <asm/ucontext.h>
#include <setjmp.h>
#include <stdint.h>
#include <string.h>
static sigjmp_buf jmpbuf;
struct _ctx_layout {
struct sctx_info *addr;
unsigned int size;
};
struct extctx_layout {
unsigned long size;
unsigned int flags;
struct _ctx_layout fpu;
struct _ctx_layout lsx;
struct _ctx_layout lasx;
struct _ctx_layout end;
};
static int parse_extcontext(struct sigcontext *sc, struct extctx_layout *extctx)
{
uint32_t magic, size;
struct sctx_info *info = (struct sctx_info *)&sc->sc_extcontext;
while(1) {
magic = (uint32_t)info->magic;
size = (uint32_t)info->size;
printf("magic is %lx\n", magic);
printf("size is %lx\n", size);
switch (magic) {
case 0: /* END*/
return 0;
case FPU_CTX_MAGIC:
if (size < (sizeof(struct sctx_info) +
sizeof(struct fpu_context))) {
return -1;
}
extctx->fpu.addr = info;
break;
case LSX_CTX_MAGIC:
if (size < (sizeof(struct sctx_info) +
sizeof(struct lsx_context))) {
return -1;
}
extctx->lsx.addr = info;
break;
case LASX_CTX_MAGIC:
if (size < (sizeof(struct sctx_info) +
sizeof(struct lasx_context))) {
return -1;
}
extctx->lasx.addr = info;
break;
default:
return -1;
}
info = (struct sctx_info *)((char *)info +size);
}
return 0;
}
static int n = 0;
static void do_signal(int sig, siginfo_t *info, void *ucontext)
{
int i;
struct ucontext *uc = (struct ucontext *)ucontext;
struct extctx_layout extctx;
memset(&extctx, 0, sizeof(struct extctx_layout));
printf("pc : %016lx\n", uc->uc_mcontext.sc_pc);
parse_extcontext(&uc->uc_mcontext, &extctx);
if (n < 5) {
printf("extctx.lasx.addr is %lx\n", extctx.lasx.addr);
printf("extctx.lsx.addr is %lx\n", extctx.lsx.addr);
printf("extctx.fpu.addr is %lx\n", extctx.fpu.addr);
if (extctx.lasx.addr) {
struct sctx_info *info = extctx.lasx.addr;
struct lasx_context *lasx_ctx = (struct lasx_context *)((char
*)info +
sizeof(struct sctx_info));
printf("vl : %016lx\n", 256);
} else if (extctx.lsx.addr) {
struct sctx_info *info = extctx.lsx.addr;
struct lsx_context *lsx_ctx = (struct lsx_context *)((char *)info +
sizeof(struct sctx_info));
printf("vl : %016lx\n", 128);
} else if (extctx.fpu.addr) {
struct sctx_info *info = extctx.fpu.addr;
struct fpu_context *fpu_ctx = (struct fpu_context *)((char *)info +
sizeof(struct sctx_info));
printf("vl : %016lx\n", 64);
}
}
n++;
printf("n is -------------- %d\n", n);
if (n == 1) {
// vaddwev.w.hu $vr27, $vr22, $vr29
asm volatile(".word 0x702ef6db");
printf("After execed LSX instructons vaddwev.w.hu\n");
}
if (n == 2) {
// 0101395e fadd.d $fs6, $ft2, $ft6
asm volatile(".word 0x0101395e");
printf("After execed FPU instructions fadd\n");
}
if (n == 3) {
// xvextrins.d $xr13, $xr15, 0x59
asm volatile(".word 0x778165ed");
printf("After execed LASX instructions xvextrins.d\n");
}
if (n == 4) {
// 0101395e fadd.d $fs6, $ft2, $ft6
asm volatile(".word 0x0101395e");
printf("After execed FPU instructions fadd\n");
}
if (n == 5) {
exit(0);
}
siglongjmp(jmpbuf, 1);
}
static int setup_signal(int sig, void (*fn) (int, siginfo_t *, void *))
{
struct sigaction my_act;
int ret;
my_act.sa_sigaction = fn;
my_act.sa_flags = SA_SIGINFO;
sigemptyset(&my_act.sa_mask);
ret = sigaction(sig, &my_act, NULL);
if (ret != 0) {
printf("FAIL: signal %d\n", sig);
return SIG_ERR;
}
}
int main()
{
setup_signal(SIGSEGV, do_signal);
sigsetjmp(jmpbuf, 1);
int result = 0;
void *addr = 0x00012;
result = *(int *)addr;
return 0;
}
On 3A5000 machine:
[root@archlinux LASX]# ./test_signal
pc : 0000000120000b44
magic is 46505501
size is 120
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 0
extctx.fpu.addr is 7ffffbdd2120
vl : 0000000000000040
n is -------------- 1
After execed LSX instructons vaddwev.w.hu
pc : 0000000120000b44
magic is 53580001
size is 220
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 7ffffbdd2020
extctx.fpu.addr is 0
vl : 0000000000000080
n is -------------- 2
After execed FPU instructions fadd
pc : 0000000120000b44
magic is 53580001
size is 220
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 7ffffbdd2020
extctx.fpu.addr is 0
vl : 0000000000000080
n is -------------- 3
After execed LASX instructions xvextrins.d
pc : 0000000120000b44
magic is 41535801
size is 430
magic is 0
size is 0
extctx.lasx.addr is 7ffffbdd1e10
extctx.lsx.addr is 0
extctx.fpu.addr is 0
vl : 0000000000000100
n is -------------- 4
After execed FPU instructions fadd
pc : 0000000120000b44
magic is 41535801
size is 430
magic is 0
size is 0
extctx.lasx.addr is 7ffffbdd1e10
extctx.lsx.addr is 0
extctx.fpu.addr is 0
vl : 0000000000000100
n is -------------- 5
QEMU user-mode on X86:
root@loongson-KVM:~/work/code/qemu# ./build/qemu-loongarch64 test_signal
pc : 0000000120000b44
magic is 46505501
size is 120
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 0
extctx.fpu.addr is 7fd92279f110
vl : 0000000000000040
n is -------------- 1
After exec LSX instructons vaddwev.w.hu
pc : 0000000120000b44
magic is 53580001
size is 220
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 7fd92279f010
extctx.fpu.addr is 0
vl : 0000000000000080
n is -------------- 2
After execed FPU instructions fadd
pc : 0000000120000b44
magic is 53580001
size is 220
magic is 0
size is 0
extctx.lasx.addr is 0
extctx.lsx.addr is 7fd92279f010
extctx.fpu.addr is 0
vl : 0000000000000080
n is -------------- 3
After execed LASX instructions xvextrins.d
pc : 0000000120000b44
magic is 41535801
size is 430
magic is 0
size is 0
extctx.lasx.addr is 7fd92279ee00
extctx.lsx.addr is 0
extctx.fpu.addr is 0
vl : 0000000000000100
n is -------------- 4
After execed FPU instructions fadd
pc : 0000000120000b44
magic is 41535801
size is 430
magic is 0
size is 0
extctx.lasx.addr is 7fd92279ee00
extctx.lsx.addr is 0
extctx.fpu.addr is 0
vl : 0000000000000100
n is -------------- 5
Please review, thanks.
Song Gao (6):
target/loongarch: Add env->extctx_flags for user-mode setup extcontext
target/loongarch: Add set_vec_extctx to set LSX/LASX instructions
extctx_flags
linux-user/loongarch64: Fix setup_extcontext alloc wrong fpu_context
size
linux-user/loongarch64: setup_sigframe() set 'end' context size 0
linux-user/loongarch64: Add LSX sigcontext save/restore
linux-user/loongarch64: Add LASX sigcontext save/restore
linux-user/loongarch64/signal.c | 168 +++++++++++++++++---
target/loongarch/cpu.c | 2 +
target/loongarch/cpu.h | 2 +
target/loongarch/insn_trans/trans_vec.c.inc | 12 ++
target/loongarch/internals.h | 4 +
target/loongarch/translate.c | 3 +
target/loongarch/translate.h | 1 +
7 files changed, 170 insertions(+), 22 deletions(-)