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[Qemu-devel] [PATCH v4 6/8] target/mips: Define the R5900 CPU
From: |
Fredrik Noring |
Subject: |
[Qemu-devel] [PATCH v4 6/8] target/mips: Define the R5900 CPU |
Date: |
Sat, 15 Sep 2018 11:50:32 +0200 |
The primary purpose of this change is to support programs compiled by
GCC for the R5900 target and thereby run R5900 Linux distributions, for
example Gentoo. In particular, this avoids issues with cross compilation.
This change has been tested with Gentoo compiled for R5900, including
native compilation of several packages under QEMU.
Signed-off-by: Fredrik Noring <address@hidden>
---
target/mips/translate_init.inc.c | 47 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/target/mips/translate_init.inc.c b/target/mips/translate_init.inc.c
index b3320b9dc7..71fd83de06 100644
--- a/target/mips/translate_init.inc.c
+++ b/target/mips/translate_init.inc.c
@@ -410,6 +410,53 @@ const mips_def_t mips_defs[] =
.insn_flags = CPU_MIPS32R5 | ASE_MSA,
.mmu_type = MMU_TYPE_R4000,
},
+ {
+ .name = "R5900",
+ .CP0_PRid = 0x00003800,
+ /* No L2 cache, icache size 32k, dcache size 32k, uncached coherency.
*/
+ .CP0_Config0 = (0x3 << 9) | (0x3 << 6) | (0x2 << CP0C0_K0),
+ .CP0_Status_rw_bitmask = 0xF4C79C1F,
+#ifdef CONFIG_USER_ONLY
+ /*
+ * R5900 hardware traps to the Linux kernel for IEEE 754-1985 and LL/SC
+ * emulation. For user only, QEMU is the kernel, so we emulate the
traps
+ * by simply emulating the instructions directly.
+ *
+ * Note: Config1 is only used internally, the R5900 has only Config0.
+ */
+ .CP0_Config1 = (1 << CP0C1_FP) | (47 << CP0C1_MMU),
+ .CP0_LLAddr_rw_bitmask = 0xFFFFFFFF,
+ .CP0_LLAddr_shift = 4,
+ .CP1_fcr0 = (0x38 << FCR0_PRID) | (0x0 << FCR0_REV),
+ .CP1_fcr31 = 0,
+ .CP1_fcr31_rw_bitmask = 0x0183FFFF,
+#else
+ /*
+ * The R5900 COP1 FPU implements single-precision floating-point
+ * operations but is not entirely IEEE 754-1985 compatible. In
+ * particular,
+ *
+ * - NaN (not a number) and plus/minus infinities are not supported;
+ * - exception mechanisms are not fully supported;
+ * - denormalized numbers are not supported;
+ * - rounding towards nearest and plus/minus infinities are not
supported;
+ * - computed results usually differs in the least significant bit;
+ * - saturating instructions can differ more than the least
significant bit.
+ *
+ * Since only rounding towards zero is supported, the two least
+ * significant bits of FCR31 are hardwired to 01.
+ *
+ * FPU emulation is disabled here until it is implemented.
+ *
+ * Note: Config1 is only used internally, the R5900 has only Config0.
+ */
+ .CP0_Config1 = (47 << CP0C1_MMU),
+#endif /* !CONFIG_USER_ONLY */
+ .SEGBITS = 32,
+ .PABITS = 32,
+ .insn_flags = CPU_R5900,
+ .mmu_type = MMU_TYPE_R4000,
+ },
{
/* A generic CPU supporting MIPS32 Release 6 ISA.
FIXME: Support IEEE 754-2008 FP.
--
2.16.4
- [Qemu-devel] [PATCH v4 0/8] target/mips: Support R5900 GCC programs in user mode, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 1/8] target/mips: Define R5900 instructions and CPU preprocessor constants, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 2/8] target/mips: Support R5900 specific three-operand MULT and MULTU, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 3/8] target/mips: Support R5900 instructions MOVN, MOVZ and PREF from MIPS IV, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 4/8] target/mips: Add function to signal RI exception unless user only, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 6/8] target/mips: Define the R5900 CPU,
Fredrik Noring <=
- [Qemu-devel] [PATCH v4 7/8] linux-user/mips: Recognise the R5900 CPU model, Fredrik Noring, 2018/09/16
- [Qemu-devel] [PATCH v4 8/8] elf: Toshiba/Sony rather than MIPS are the implementors of the R5900, Fredrik Noring, 2018/09/16
- Re: [Qemu-devel] [PATCH v4 8/8] elf: Toshiba/Sony rather than MIPS are the implementors of the R5900, Philippe Mathieu-Daudé, 2018/09/16
- Re: [Qemu-devel] [PATCH v4 7/8] linux-user/mips: Recognise the R5900 CPU model, Philippe Mathieu-Daudé, 2018/09/16
- Re: [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Philippe Mathieu-Daudé, 2018/09/16
- Re: [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Maciej W. Rozycki, 2018/09/17
- Re: [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Fredrik Noring, 2018/09/18
- Re: [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Maciej W. Rozycki, 2018/09/18
- Re: [Qemu-devel] [PATCH v4 5/8] target/mips: R5900 DMULT[U], DDIV[U], LL, SC, LLD and SCD are user only, Philippe Mathieu-Daudé, 2018/09/19
- Re: [Qemu-devel] [PATCH v4 4/8] target/mips: Add function to signal RI exception unless user only, Philippe Mathieu-Daudé, 2018/09/16