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linux-user/sparc: Correct set/get_context handling of fp and i7

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Because QEMU's user-mode emulation just directly accesses guest CPU
state, for SPARC the guest register window state is not the same in
the sparc64_get_context() and sparc64_set_context() functions as it
is for the real kernel's versions of those functions.  Specifically,
for the kernel it has saved the user space state such that the O*
registers go into a pt_regs struct as UREG_I*, and the I* registers
have been spilled onto the userspace stack.  For QEMU, we haven't
done that, so the guest's O* registers are still in WREG_O* and the
I* registers in WREG_I*.

The code was already accessing the O* registers correctly for QEMU,
but had copied the kernel code for accessing the I* registers off the
userspace stack.  Replace this with direct accesses to fp and i7 in
the CPU state, and add a comment explaining why we differ from the
kernel code here.

This fix is sufficient to get bash to a shell prompt.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201105212314.9628-3-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Peter Maydell 2020-11-05 21:23:13 +00:00 committed by Laurent Vivier
parent b8ae597f0e
commit 266b41582e
1 changed files with 22 additions and 25 deletions
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47
linux-user/sparc/signal.c
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@ -403,7 +403,6 @@ void sparc64_set_context(CPUSPARCState *env)
struct target_ucontext *ucp;
target_mc_gregset_t *grp;
abi_ulong pc, npc, tstate;
abi_ulong fp, i7, w_addr;
unsigned int i;
ucp_addr = env->regwptr[WREG_O0];
@ -447,6 +446,15 @@ void sparc64_set_context(CPUSPARCState *env)
__get_user(env->gregs[5], (&(*grp)[SPARC_MC_G5]));
__get_user(env->gregs[6], (&(*grp)[SPARC_MC_G6]));
__get_user(env->gregs[7], (&(*grp)[SPARC_MC_G7]));
/*
* Note that unlike the kernel, we didn't need to mess with the
* guest register window state to save it into a pt_regs to run
* the kernel. So for us the guest's O regs are still in WREG_O*
* (unlike the kernel which has put them in UREG_I* in a pt_regs)
* and the fp and i7 are still in WREG_I6 and WREG_I7 and don't
* need to be written back to userspace memory.
*/
__get_user(env->regwptr[WREG_O0], (&(*grp)[SPARC_MC_O0]));
__get_user(env->regwptr[WREG_O1], (&(*grp)[SPARC_MC_O1]));
__get_user(env->regwptr[WREG_O2], (&(*grp)[SPARC_MC_O2]));
@ -456,18 +464,9 @@ void sparc64_set_context(CPUSPARCState *env)
__get_user(env->regwptr[WREG_O6], (&(*grp)[SPARC_MC_O6]));
__get_user(env->regwptr[WREG_O7], (&(*grp)[SPARC_MC_O7]));
__get_user(fp, &(ucp->tuc_mcontext.mc_fp));
__get_user(i7, &(ucp->tuc_mcontext.mc_i7));
__get_user(env->regwptr[WREG_FP], &(ucp->tuc_mcontext.mc_fp));
__get_user(env->regwptr[WREG_I7], &(ucp->tuc_mcontext.mc_i7));
w_addr = TARGET_STACK_BIAS + env->regwptr[WREG_O6];
if (put_user(fp, w_addr + offsetof(struct target_reg_window, ins[6]),
abi_ulong) != 0) {
goto do_sigsegv;
}
if (put_user(i7, w_addr + offsetof(struct target_reg_window, ins[7]),
abi_ulong) != 0) {
goto do_sigsegv;
}
/* FIXME this does not match how the kernel handles the FPU in
* its sparc64_set_context implementation. In particular the FPU
* is only restored if fenab is non-zero in:
@ -501,7 +500,6 @@ void sparc64_get_context(CPUSPARCState *env)
struct target_ucontext *ucp;
target_mc_gregset_t *grp;
target_mcontext_t *mcp;
abi_ulong fp, i7, w_addr;
int err;
unsigned int i;
target_sigset_t target_set;
@ -553,6 +551,15 @@ void sparc64_get_context(CPUSPARCState *env)
__put_user(env->gregs[5], &((*grp)[SPARC_MC_G5]));
__put_user(env->gregs[6], &((*grp)[SPARC_MC_G6]));
__put_user(env->gregs[7], &((*grp)[SPARC_MC_G7]));
/*
* Note that unlike the kernel, we didn't need to mess with the
* guest register window state to save it into a pt_regs to run
* the kernel. So for us the guest's O regs are still in WREG_O*
* (unlike the kernel which has put them in UREG_I* in a pt_regs)
* and the fp and i7 are still in WREG_I6 and WREG_I7 and don't
* need to be fished out of userspace memory.
*/
__put_user(env->regwptr[WREG_O0], &((*grp)[SPARC_MC_O0]));
__put_user(env->regwptr[WREG_O1], &((*grp)[SPARC_MC_O1]));
__put_user(env->regwptr[WREG_O2], &((*grp)[SPARC_MC_O2]));
@ -562,18 +569,8 @@ void sparc64_get_context(CPUSPARCState *env)
__put_user(env->regwptr[WREG_O6], &((*grp)[SPARC_MC_O6]));
__put_user(env->regwptr[WREG_O7], &((*grp)[SPARC_MC_O7]));
w_addr = TARGET_STACK_BIAS + env->regwptr[WREG_O6];
fp = i7 = 0;
if (get_user(fp, w_addr + offsetof(struct target_reg_window, ins[6]),
abi_ulong) != 0) {
goto do_sigsegv;
}
if (get_user(i7, w_addr + offsetof(struct target_reg_window, ins[7]),
abi_ulong) != 0) {
goto do_sigsegv;
}
__put_user(fp, &(mcp->mc_fp));
__put_user(i7, &(mcp->mc_i7));
__put_user(env->regwptr[WREG_FP], &(mcp->mc_fp));
__put_user(env->regwptr[WREG_I7], &(mcp->mc_i7));
{
uint32_t *dst = ucp->tuc_mcontext.mc_fpregs.mcfpu_fregs.sregs;