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Diffstat (limited to 'arch/powerpc/math-emu/math_efp.c')
-rw-r--r--arch/powerpc/math-emu/math_efp.c360
1 files changed, 260 insertions, 100 deletions
diff --git a/arch/powerpc/math-emu/math_efp.c b/arch/powerpc/math-emu/math_efp.c
index a73f0884d358..34f62aafe706 100644
--- a/arch/powerpc/math-emu/math_efp.c
+++ b/arch/powerpc/math-emu/math_efp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* arch/powerpc/math-emu/math_efp.c
*
@@ -12,16 +13,13 @@
* Description:
* This file is the exception handler to make E500 SPE instructions
* fully comply with IEEE-754 floating point standard.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
+#include <linux/prctl.h>
+#include <linux/module.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/reg.h>
#define FP_EX_BOOKE_E500_SPE
@@ -221,6 +219,7 @@ int do_spe_mathemu(struct pt_regs *regs)
case AB:
case XCR:
FP_UNPACK_SP(SA, va.wp + 1);
+ fallthrough;
case XB:
FP_UNPACK_SP(SB, vb.wp + 1);
break;
@@ -229,8 +228,8 @@ int do_spe_mathemu(struct pt_regs *regs)
break;
}
- pr_debug("SA: %ld %08lx %ld (%ld)\n", SA_s, SA_f, SA_e, SA_c);
- pr_debug("SB: %ld %08lx %ld (%ld)\n", SB_s, SB_f, SB_e, SB_c);
+ pr_debug("SA: %d %08x %d (%d)\n", SA_s, SA_f, SA_e, SA_c);
+ pr_debug("SB: %d %08x %d (%d)\n", SB_s, SB_f, SB_e, SB_c);
switch (func) {
case EFSABS:
@@ -275,21 +274,13 @@ int do_spe_mathemu(struct pt_regs *regs)
case EFSCTSF:
case EFSCTUF:
- if (!((vb.wp[1] >> 23) == 0xff && ((vb.wp[1] & 0x7fffff) > 0))) {
- /* NaN */
- if (((vb.wp[1] >> 23) & 0xff) == 0) {
- /* denorm */
- vc.wp[1] = 0x0;
- } else if ((vb.wp[1] >> 31) == 0) {
- /* positive normal */
- vc.wp[1] = (func == EFSCTSF) ?
- 0x7fffffff : 0xffffffff;
- } else { /* negative normal */
- vc.wp[1] = (func == EFSCTSF) ?
- 0x80000000 : 0x0;
- }
- } else { /* rB is NaN */
- vc.wp[1] = 0x0;
+ if (SB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ SB_e += (func == EFSCTSF ? 31 : 32);
+ FP_TO_INT_ROUND_S(vc.wp[1], SB, 32,
+ (func == EFSCTSF) ? 1 : 0);
}
goto update_regs;
@@ -298,7 +289,7 @@ int do_spe_mathemu(struct pt_regs *regs)
FP_CLEAR_EXCEPTIONS;
FP_UNPACK_DP(DB, vb.dp);
- pr_debug("DB: %ld %08lx %08lx %ld (%ld)\n",
+ pr_debug("DB: %d %08x %08x %d (%d)\n",
DB_s, DB_f1, DB_f0, DB_e, DB_c);
FP_CONV(S, D, 1, 2, SR, DB);
@@ -306,16 +297,25 @@ int do_spe_mathemu(struct pt_regs *regs)
}
case EFSCTSI:
- case EFSCTSIZ:
case EFSCTUI:
+ if (SB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_ROUND_S(vc.wp[1], SB, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
+ }
+ goto update_regs;
+
+ case EFSCTSIZ:
case EFSCTUIZ:
- if (func & 0x4) {
- _FP_ROUND(1, SB);
+ if (SB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
} else {
- _FP_ROUND_ZERO(1, SB);
+ FP_TO_INT_S(vc.wp[1], SB, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
}
- FP_TO_INT_S(vc.wp[1], SB, 32,
- (((func & 0x3) != 0) || SB_s));
goto update_regs;
default:
@@ -324,7 +324,7 @@ int do_spe_mathemu(struct pt_regs *regs)
break;
pack_s:
- pr_debug("SR: %ld %08lx %ld (%ld)\n", SR_s, SR_f, SR_e, SR_c);
+ pr_debug("SR: %d %08x %d (%d)\n", SR_s, SR_f, SR_e, SR_c);
FP_PACK_SP(vc.wp + 1, SR);
goto update_regs;
@@ -348,6 +348,7 @@ cmp_s:
case AB:
case XCR:
FP_UNPACK_DP(DA, va.dp);
+ fallthrough;
case XB:
FP_UNPACK_DP(DB, vb.dp);
break;
@@ -356,9 +357,9 @@ cmp_s:
break;
}
- pr_debug("DA: %ld %08lx %08lx %ld (%ld)\n",
+ pr_debug("DA: %d %08x %08x %d (%d)\n",
DA_s, DA_f1, DA_f0, DA_e, DA_c);
- pr_debug("DB: %ld %08lx %08lx %ld (%ld)\n",
+ pr_debug("DB: %d %08x %08x %d (%d)\n",
DB_s, DB_f1, DB_f0, DB_e, DB_c);
switch (func) {
@@ -404,22 +405,13 @@ cmp_s:
case EFDCTSF:
case EFDCTUF:
- if (!((vb.wp[0] >> 20) == 0x7ff &&
- ((vb.wp[0] & 0xfffff) > 0 || (vb.wp[1] > 0)))) {
- /* not a NaN */
- if (((vb.wp[0] >> 20) & 0x7ff) == 0) {
- /* denorm */
- vc.wp[1] = 0x0;
- } else if ((vb.wp[0] >> 31) == 0) {
- /* positive normal */
- vc.wp[1] = (func == EFDCTSF) ?
- 0x7fffffff : 0xffffffff;
- } else { /* negative normal */
- vc.wp[1] = (func == EFDCTSF) ?
- 0x80000000 : 0x0;
- }
- } else { /* NaN */
- vc.wp[1] = 0x0;
+ if (DB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ DB_e += (func == EFDCTSF ? 31 : 32);
+ FP_TO_INT_ROUND_D(vc.wp[1], DB, 32,
+ (func == EFDCTSF) ? 1 : 0);
}
goto update_regs;
@@ -428,7 +420,7 @@ cmp_s:
FP_CLEAR_EXCEPTIONS;
FP_UNPACK_SP(SB, vb.wp + 1);
- pr_debug("SB: %ld %08lx %ld (%ld)\n",
+ pr_debug("SB: %d %08x %d (%d)\n",
SB_s, SB_f, SB_e, SB_c);
FP_CONV(D, S, 2, 1, DR, SB);
@@ -437,21 +429,35 @@ cmp_s:
case EFDCTUIDZ:
case EFDCTSIDZ:
- _FP_ROUND_ZERO(2, DB);
- FP_TO_INT_D(vc.dp[0], DB, 64, ((func & 0x1) == 0));
+ if (DB_c == FP_CLS_NAN) {
+ vc.dp[0] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_D(vc.dp[0], DB, 64,
+ ((func & 0x1) == 0) ? 1 : 0);
+ }
goto update_regs;
case EFDCTUI:
case EFDCTSI:
+ if (DB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_ROUND_D(vc.wp[1], DB, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
+ }
+ goto update_regs;
+
case EFDCTUIZ:
case EFDCTSIZ:
- if (func & 0x4) {
- _FP_ROUND(2, DB);
+ if (DB_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
} else {
- _FP_ROUND_ZERO(2, DB);
+ FP_TO_INT_D(vc.wp[1], DB, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
}
- FP_TO_INT_D(vc.wp[1], DB, 32,
- (((func & 0x3) != 0) || DB_s));
goto update_regs;
default:
@@ -460,7 +466,7 @@ cmp_s:
break;
pack_d:
- pr_debug("DR: %ld %08lx %08lx %ld (%ld)\n",
+ pr_debug("DR: %d %08x %08x %d (%d)\n",
DR_s, DR_f1, DR_f0, DR_e, DR_c);
FP_PACK_DP(vc.dp, DR);
@@ -489,6 +495,7 @@ cmp_d:
case XCR:
FP_UNPACK_SP(SA0, va.wp);
FP_UNPACK_SP(SA1, va.wp + 1);
+ fallthrough;
case XB:
FP_UNPACK_SP(SB0, vb.wp);
FP_UNPACK_SP(SB1, vb.wp + 1);
@@ -499,13 +506,13 @@ cmp_d:
break;
}
- pr_debug("SA0: %ld %08lx %ld (%ld)\n",
+ pr_debug("SA0: %d %08x %d (%d)\n",
SA0_s, SA0_f, SA0_e, SA0_c);
- pr_debug("SA1: %ld %08lx %ld (%ld)\n",
+ pr_debug("SA1: %d %08x %d (%d)\n",
SA1_s, SA1_f, SA1_e, SA1_c);
- pr_debug("SB0: %ld %08lx %ld (%ld)\n",
+ pr_debug("SB0: %d %08x %d (%d)\n",
SB0_s, SB0_f, SB0_e, SB0_c);
- pr_debug("SB1: %ld %08lx %ld (%ld)\n",
+ pr_debug("SB1: %d %08x %d (%d)\n",
SB1_s, SB1_f, SB1_e, SB1_c);
switch (func) {
@@ -556,37 +563,60 @@ cmp_d:
cmp = -1;
goto cmp_vs;
- case EVFSCTSF:
- __asm__ __volatile__ ("mtspr 512, %4\n"
- "efsctsf %0, %2\n"
- "efsctsf %1, %3\n"
- : "=r" (vc.wp[0]), "=r" (vc.wp[1])
- : "r" (vb.wp[0]), "r" (vb.wp[1]), "r" (0));
- goto update_regs;
-
case EVFSCTUF:
- __asm__ __volatile__ ("mtspr 512, %4\n"
- "efsctuf %0, %2\n"
- "efsctuf %1, %3\n"
- : "=r" (vc.wp[0]), "=r" (vc.wp[1])
- : "r" (vb.wp[0]), "r" (vb.wp[1]), "r" (0));
+ case EVFSCTSF:
+ if (SB0_c == FP_CLS_NAN) {
+ vc.wp[0] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ SB0_e += (func == EVFSCTSF ? 31 : 32);
+ FP_TO_INT_ROUND_S(vc.wp[0], SB0, 32,
+ (func == EVFSCTSF) ? 1 : 0);
+ }
+ if (SB1_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ SB1_e += (func == EVFSCTSF ? 31 : 32);
+ FP_TO_INT_ROUND_S(vc.wp[1], SB1, 32,
+ (func == EVFSCTSF) ? 1 : 0);
+ }
goto update_regs;
case EVFSCTUI:
case EVFSCTSI:
+ if (SB0_c == FP_CLS_NAN) {
+ vc.wp[0] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_ROUND_S(vc.wp[0], SB0, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
+ }
+ if (SB1_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_ROUND_S(vc.wp[1], SB1, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
+ }
+ goto update_regs;
+
case EVFSCTUIZ:
case EVFSCTSIZ:
- if (func & 0x4) {
- _FP_ROUND(1, SB0);
- _FP_ROUND(1, SB1);
+ if (SB0_c == FP_CLS_NAN) {
+ vc.wp[0] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
+ } else {
+ FP_TO_INT_S(vc.wp[0], SB0, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
+ }
+ if (SB1_c == FP_CLS_NAN) {
+ vc.wp[1] = 0;
+ FP_SET_EXCEPTION(FP_EX_INVALID);
} else {
- _FP_ROUND_ZERO(1, SB0);
- _FP_ROUND_ZERO(1, SB1);
+ FP_TO_INT_S(vc.wp[1], SB1, 32,
+ ((func & 0x3) != 0) ? 1 : 0);
}
- FP_TO_INT_S(vc.wp[0], SB0, 32,
- (((func & 0x3) != 0) || SB0_s));
- FP_TO_INT_S(vc.wp[1], SB1, 32,
- (((func & 0x3) != 0) || SB1_s));
goto update_regs;
default:
@@ -595,9 +625,9 @@ cmp_d:
break;
pack_vs:
- pr_debug("SR0: %ld %08lx %ld (%ld)\n",
+ pr_debug("SR0: %d %08x %d (%d)\n",
SR0_s, SR0_f, SR0_e, SR0_c);
- pr_debug("SR1: %ld %08lx %ld (%ld)\n",
+ pr_debug("SR1: %d %08x %d (%d)\n",
SR1_s, SR1_f, SR1_e, SR1_c);
FP_PACK_SP(vc.wp, SR0);
@@ -630,9 +660,27 @@ update_ccr:
regs->ccr |= (IR << ((7 - ((speinsn >> 23) & 0x7)) << 2));
update_regs:
- __FPU_FPSCR &= ~FP_EX_MASK;
+ /*
+ * If the "invalid" exception sticky bit was set by the
+ * processor for non-finite input, but was not set before the
+ * instruction being emulated, clear it. Likewise for the
+ * "underflow" bit, which may have been set by the processor
+ * for exact underflow, not just inexact underflow when the
+ * flag should be set for IEEE 754 semantics. Other sticky
+ * exceptions will only be set by the processor when they are
+ * correct according to IEEE 754 semantics, and we must not
+ * clear sticky bits that were already set before the emulated
+ * instruction as they represent the user-visible sticky
+ * exception status. "inexact" traps to kernel are not
+ * required for IEEE semantics and are not enabled by default,
+ * so the "inexact" sticky bit may have been set by a previous
+ * instruction without the kernel being aware of it.
+ */
+ __FPU_FPSCR
+ &= ~(FP_EX_INVALID | FP_EX_UNDERFLOW) | current->thread.spefscr_last;
__FPU_FPSCR |= (FP_CUR_EXCEPTIONS & FP_EX_MASK);
mtspr(SPRN_SPEFSCR, __FPU_FPSCR);
+ current->thread.spefscr_last = __FPU_FPSCR;
current->thread.evr[fc] = vc.wp[0];
regs->gpr[fc] = vc.wp[1];
@@ -644,12 +692,29 @@ update_regs:
pr_debug("va: %08x %08x\n", va.wp[0], va.wp[1]);
pr_debug("vb: %08x %08x\n", vb.wp[0], vb.wp[1]);
+ if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) {
+ if ((FP_CUR_EXCEPTIONS & FP_EX_DIVZERO)
+ && (current->thread.fpexc_mode & PR_FP_EXC_DIV))
+ return 1;
+ if ((FP_CUR_EXCEPTIONS & FP_EX_OVERFLOW)
+ && (current->thread.fpexc_mode & PR_FP_EXC_OVF))
+ return 1;
+ if ((FP_CUR_EXCEPTIONS & FP_EX_UNDERFLOW)
+ && (current->thread.fpexc_mode & PR_FP_EXC_UND))
+ return 1;
+ if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT)
+ && (current->thread.fpexc_mode & PR_FP_EXC_RES))
+ return 1;
+ if ((FP_CUR_EXCEPTIONS & FP_EX_INVALID)
+ && (current->thread.fpexc_mode & PR_FP_EXC_INV))
+ return 1;
+ }
return 0;
illegal:
if (have_e500_cpu_a005_erratum) {
/* according to e500 cpu a005 erratum, reissue efp inst */
- regs->nip -= 4;
+ regs_add_return_ip(regs, -4);
pr_debug("re-issue efp inst: %08lx\n", speinsn);
return 0;
}
@@ -662,21 +727,28 @@ int speround_handler(struct pt_regs *regs)
{
union dw_union fgpr;
int s_lo, s_hi;
- unsigned long speinsn, type, fc;
+ int lo_inexact, hi_inexact;
+ int fp_result;
+ unsigned long speinsn, type, fb, fc, fptype, func;
if (get_user(speinsn, (unsigned int __user *) regs->nip))
return -EFAULT;
if ((speinsn >> 26) != 4)
return -EINVAL; /* not an spe instruction */
- type = insn_type(speinsn & 0x7ff);
+ func = speinsn & 0x7ff;
+ type = insn_type(func);
if (type == XCR) return -ENOSYS;
__FPU_FPSCR = mfspr(SPRN_SPEFSCR);
pr_debug("speinsn:%08lx spefscr:%08lx\n", speinsn, __FPU_FPSCR);
+ fptype = (speinsn >> 5) & 0x7;
+
/* No need to round if the result is exact */
- if (!(__FPU_FPSCR & FP_EX_INEXACT))
+ lo_inexact = __FPU_FPSCR & (SPEFSCR_FG | SPEFSCR_FX);
+ hi_inexact = __FPU_FPSCR & (SPEFSCR_FGH | SPEFSCR_FXH);
+ if (!(lo_inexact || (hi_inexact && fptype == VCT)))
return 0;
fc = (speinsn >> 21) & 0x1f;
@@ -685,9 +757,68 @@ int speround_handler(struct pt_regs *regs)
fgpr.wp[0] = current->thread.evr[fc];
fgpr.wp[1] = regs->gpr[fc];
+ fb = (speinsn >> 11) & 0x1f;
+ switch (func) {
+ case EFSCTUIZ:
+ case EFSCTSIZ:
+ case EVFSCTUIZ:
+ case EVFSCTSIZ:
+ case EFDCTUIDZ:
+ case EFDCTSIDZ:
+ case EFDCTUIZ:
+ case EFDCTSIZ:
+ /*
+ * These instructions always round to zero,
+ * independent of the rounding mode.
+ */
+ return 0;
+
+ case EFSCTUI:
+ case EFSCTUF:
+ case EVFSCTUI:
+ case EVFSCTUF:
+ case EFDCTUI:
+ case EFDCTUF:
+ fp_result = 0;
+ s_lo = 0;
+ s_hi = 0;
+ break;
+
+ case EFSCTSI:
+ case EFSCTSF:
+ fp_result = 0;
+ /* Recover the sign of a zero result if possible. */
+ if (fgpr.wp[1] == 0)
+ s_lo = regs->gpr[fb] & SIGN_BIT_S;
+ break;
+
+ case EVFSCTSI:
+ case EVFSCTSF:
+ fp_result = 0;
+ /* Recover the sign of a zero result if possible. */
+ if (fgpr.wp[1] == 0)
+ s_lo = regs->gpr[fb] & SIGN_BIT_S;
+ if (fgpr.wp[0] == 0)
+ s_hi = current->thread.evr[fb] & SIGN_BIT_S;
+ break;
+
+ case EFDCTSI:
+ case EFDCTSF:
+ fp_result = 0;
+ s_hi = s_lo;
+ /* Recover the sign of a zero result if possible. */
+ if (fgpr.wp[1] == 0)
+ s_hi = current->thread.evr[fb] & SIGN_BIT_S;
+ break;
+
+ default:
+ fp_result = 1;
+ break;
+ }
+
pr_debug("round fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
- switch ((speinsn >> 5) & 0x7) {
+ switch (fptype) {
/* Since SPE instructions on E500 core can handle round to nearest
* and round toward zero with IEEE-754 complied, we just need
* to handle round toward +Inf and round toward -Inf by software.
@@ -696,25 +827,52 @@ int speround_handler(struct pt_regs *regs)
if ((FP_ROUNDMODE) == FP_RND_PINF) {
if (!s_lo) fgpr.wp[1]++; /* Z > 0, choose Z1 */
} else { /* round to -Inf */
- if (s_lo) fgpr.wp[1]++; /* Z < 0, choose Z2 */
+ if (s_lo) {
+ if (fp_result)
+ fgpr.wp[1]++; /* Z < 0, choose Z2 */
+ else
+ fgpr.wp[1]--; /* Z < 0, choose Z2 */
+ }
}
break;
case DPFP:
if (FP_ROUNDMODE == FP_RND_PINF) {
- if (!s_hi) fgpr.dp[0]++; /* Z > 0, choose Z1 */
+ if (!s_hi) {
+ if (fp_result)
+ fgpr.dp[0]++; /* Z > 0, choose Z1 */
+ else
+ fgpr.wp[1]++; /* Z > 0, choose Z1 */
+ }
} else { /* round to -Inf */
- if (s_hi) fgpr.dp[0]++; /* Z < 0, choose Z2 */
+ if (s_hi) {
+ if (fp_result)
+ fgpr.dp[0]++; /* Z < 0, choose Z2 */
+ else
+ fgpr.wp[1]--; /* Z < 0, choose Z2 */
+ }
}
break;
case VCT:
if (FP_ROUNDMODE == FP_RND_PINF) {
- if (!s_lo) fgpr.wp[1]++; /* Z_low > 0, choose Z1 */
- if (!s_hi) fgpr.wp[0]++; /* Z_high word > 0, choose Z1 */
+ if (lo_inexact && !s_lo)
+ fgpr.wp[1]++; /* Z_low > 0, choose Z1 */
+ if (hi_inexact && !s_hi)
+ fgpr.wp[0]++; /* Z_high word > 0, choose Z1 */
} else { /* round to -Inf */
- if (s_lo) fgpr.wp[1]++; /* Z_low < 0, choose Z2 */
- if (s_hi) fgpr.wp[0]++; /* Z_high < 0, choose Z2 */
+ if (lo_inexact && s_lo) {
+ if (fp_result)
+ fgpr.wp[1]++; /* Z_low < 0, choose Z2 */
+ else
+ fgpr.wp[1]--; /* Z_low < 0, choose Z2 */
+ }
+ if (hi_inexact && s_hi) {
+ if (fp_result)
+ fgpr.wp[0]++; /* Z_high < 0, choose Z2 */
+ else
+ fgpr.wp[0]--; /* Z_high < 0, choose Z2 */
+ }
}
break;
@@ -727,10 +885,12 @@ int speround_handler(struct pt_regs *regs)
pr_debug(" to fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
+ if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
+ return (current->thread.fpexc_mode & PR_FP_EXC_RES) ? 1 : 0;
return 0;
}
-int __init spe_mathemu_init(void)
+static int __init spe_mathemu_init(void)
{
u32 pvr, maj, min;
generated by cgit (git 2.34.1) at 2025-12-25 11:48:10 +0000