[RFA] rs6000-tdep.c: pseudoregs infrastructure
Elena Zannoni
ezannoni@redhat.com
Sun Aug 18 10:42:00 GMT 2002
This patch introduces pseudo registers for the powerpc.
The infrasctructure is not used yet.
I'll send other patches which make use of it pretty soon.
The only thing I am not sure is whether it wouldn't be better to add
initialization values for the new fields added, instead of letting
them deafult to 0. I think the code would be probably easier to
maintain if I just added explicit zero's for those fields. yes? no?
Elena
2002-08-18 Elena Zannoni <ezannoni@redhat.com>
* rs6000-tdep.c (struct reg): Add field to indicate a pseudo
register.
(P): New macro to define a register as a pseudo register.
(struct variant): Add new fields for number of pseudo registers
and number of total registers.
(tot_num_registers): New macro replacing....
(num_registers): ...deleted macro.
(num_registers): New function.
(num_pseudo_registers): New function.
(variants): Update all variants to intialize new fields correctly.
Postpone initialization of number of pseudo regs and real regs.
(init_variants): New function.
(rs6000_gdbarch_init): Initialize variants. Update calculation of
registers offsets.
Index: rs6000-tdep.c
===================================================================
RCS file: /cvs/uberbaum/gdb/rs6000-tdep.c,v
retrieving revision 1.70
diff -u -p -p -r1.70 rs6000-tdep.c
--- rs6000-tdep.c 15 Jul 2002 15:09:55 -0000 1.70
+++ rs6000-tdep.c 18 Aug 2002 17:32:27 -0000
@@ -86,6 +86,7 @@ struct reg
unsigned char sz32; /* size on 32-bit arch, 0 if nonextant */
unsigned char sz64; /* size on 64-bit arch, 0 if nonextant */
unsigned char fpr; /* whether register is floating-point */
+ unsigned char pseudo; /* whether register is pseudo */
};
/* Return the current architecture's gdbarch_tdep structure. */
@@ -2064,6 +2065,9 @@ rs6000_convert_from_func_ptr_addr (CORE_
/* Return a struct reg defining floating-point register NAME. */
#define F(name) { STR(name), 8, 8, 1 }
+/* Return a struct reg defining a pseudo register NAME. */
+#define P(name) { STR(name), 4, 8, 0, 1}
+
/* Return a struct reg defining register NAME that's 32 bits on 32-bit
systems and that doesn't exist on 64-bit systems. */
#define R32(name) { STR(name), 4, 0, 0 }
@@ -2318,10 +2322,38 @@ struct variant
/* Table of register names; registers[R] is the name of the register
number R. */
int nregs;
+ int npregs;
+ int num_tot_regs;
const struct reg *regs;
};
-#define num_registers(list) (sizeof (list) / sizeof((list)[0]))
+#define tot_num_registers(list) (sizeof (list) / sizeof((list)[0]))
+
+int
+num_registers(const struct reg *reg_list, int num_tot_regs)
+{
+ int i;
+ int nregs = num_tot_regs;
+
+ for (i = 0; i < num_tot_regs; i++)
+ if (reg_list[i].pseudo == 1)
+ nregs--;
+
+ return nregs;
+}
+
+int
+num_pseudo_registers (const struct reg *reg_list, int num_tot_regs)
+{
+ int i;
+ int npregs = 0;
+
+ for (i = 0; i < num_tot_regs; i++)
+ if (reg_list[i].pseudo == 1)
+ npregs ++;
+
+ return npregs;
+}
/* Information in this table comes from the following web sites:
@@ -2334,59 +2366,95 @@ struct variant
If you add entries to this table, please be sure to allow the new
value as an argument to the --with-cpu flag, in configure.in. */
-static const struct variant variants[] =
+static struct variant variants[] =
{
+
{"powerpc", "PowerPC user-level", bfd_arch_powerpc,
- bfd_mach_ppc, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"power", "POWER user-level", bfd_arch_rs6000,
- bfd_mach_rs6k, num_registers (registers_power), registers_power},
+ bfd_mach_rs6k, -1, -1, tot_num_registers (registers_power),
+ registers_power},
{"403", "IBM PowerPC 403", bfd_arch_powerpc,
- bfd_mach_ppc_403, num_registers (registers_403), registers_403},
+ bfd_mach_ppc_403, -1, -1, tot_num_registers (registers_403),
+ registers_403},
{"601", "Motorola PowerPC 601", bfd_arch_powerpc,
- bfd_mach_ppc_601, num_registers (registers_601), registers_601},
+ bfd_mach_ppc_601, -1, -1, tot_num_registers (registers_601),
+ registers_601},
{"602", "Motorola PowerPC 602", bfd_arch_powerpc,
- bfd_mach_ppc_602, num_registers (registers_602), registers_602},
+ bfd_mach_ppc_602, -1, -1, tot_num_registers (registers_602),
+ registers_602},
{"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc,
- bfd_mach_ppc_603, num_registers (registers_603), registers_603},
+ bfd_mach_ppc_603, -1, -1, tot_num_registers (registers_603),
+ registers_603},
{"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc,
- 604, num_registers (registers_604), registers_604},
+ 604, -1, -1, tot_num_registers (registers_604),
+ registers_604},
{"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc,
- bfd_mach_ppc_403gc, num_registers (registers_403GC), registers_403GC},
+ bfd_mach_ppc_403gc, -1, -1, tot_num_registers (registers_403GC),
+ registers_403GC},
{"505", "Motorola PowerPC 505", bfd_arch_powerpc,
- bfd_mach_ppc_505, num_registers (registers_505), registers_505},
+ bfd_mach_ppc_505, -1, -1, tot_num_registers (registers_505),
+ registers_505},
{"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc,
- bfd_mach_ppc_860, num_registers (registers_860), registers_860},
+ bfd_mach_ppc_860, -1, -1, tot_num_registers (registers_860),
+ registers_860},
{"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc,
- bfd_mach_ppc_750, num_registers (registers_750), registers_750},
+ bfd_mach_ppc_750, -1, -1, tot_num_registers (registers_750),
+ registers_750},
{"7400", "Motorola/IBM PowerPC 7400 (G4)", bfd_arch_powerpc,
- bfd_mach_ppc_7400, num_registers (registers_7400), registers_7400},
+ bfd_mach_ppc_7400, -1, -1, tot_num_registers (registers_7400),
+ registers_7400},
/* 64-bit */
{"powerpc64", "PowerPC 64-bit user-level", bfd_arch_powerpc,
- bfd_mach_ppc64, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc64, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"620", "Motorola PowerPC 620", bfd_arch_powerpc,
- bfd_mach_ppc_620, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc_620, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"630", "Motorola PowerPC 630", bfd_arch_powerpc,
- bfd_mach_ppc_630, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc_630, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"a35", "PowerPC A35", bfd_arch_powerpc,
- bfd_mach_ppc_a35, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc_a35, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"rs64ii", "PowerPC rs64ii", bfd_arch_powerpc,
- bfd_mach_ppc_rs64ii, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc_rs64ii, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
{"rs64iii", "PowerPC rs64iii", bfd_arch_powerpc,
- bfd_mach_ppc_rs64iii, num_registers (registers_powerpc), registers_powerpc},
+ bfd_mach_ppc_rs64iii, -1, -1, tot_num_registers (registers_powerpc),
+ registers_powerpc},
/* FIXME: I haven't checked the register sets of the following. */
{"rs1", "IBM POWER RS1", bfd_arch_rs6000,
- bfd_mach_rs6k_rs1, num_registers (registers_power), registers_power},
+ bfd_mach_rs6k_rs1, -1, -1, tot_num_registers (registers_power),
+ registers_power},
{"rsc", "IBM POWER RSC", bfd_arch_rs6000,
- bfd_mach_rs6k_rsc, num_registers (registers_power), registers_power},
+ bfd_mach_rs6k_rsc, -1, -1, tot_num_registers (registers_power),
+ registers_power},
{"rs2", "IBM POWER RS2", bfd_arch_rs6000,
- bfd_mach_rs6k_rs2, num_registers (registers_power), registers_power},
+ bfd_mach_rs6k_rs2, -1, -1, tot_num_registers (registers_power),
+ registers_power},
{0, 0, 0, 0}
};
-#undef num_registers
+/* Initialize the number of registers and pseudo registers in each variant. */
+
+static void
+init_variants (void)
+{
+ struct variant *v;
+
+ for (v = variants; v->name; v++)
+ {
+ if (v->nregs == -1)
+ v->nregs = num_registers (v->regs, v->num_tot_regs);
+ if (v->npregs == -1)
+ v->npregs = num_pseudo_registers (v->regs, v->num_tot_regs);
+ }
+}
/* Return the variant corresponding to architecture ARCH and machine number
MACH. If no such variant exists, return null. */
@@ -2508,6 +2576,9 @@ rs6000_gdbarch_init (struct gdbarch_info
gdbarch = gdbarch_alloc (&info, tdep);
power = arch == bfd_arch_rs6000;
+ /* Initialize the number of real and pseudo registers in each variant. */
+ init_variants ();
+
/* Choose variant. */
v = find_variant_by_arch (arch, mach);
if (!v)
@@ -2557,8 +2628,8 @@ rs6000_gdbarch_init (struct gdbarch_info
tdep->lr_frame_offset = 8;
/* Calculate byte offsets in raw register array. */
- tdep->regoff = xmalloc (v->nregs * sizeof (int));
- for (i = off = 0; i < v->nregs; i++)
+ tdep->regoff = xmalloc (v->num_tot_regs * sizeof (int));
+ for (i = off = 0; i < v->num_tot_regs; i++)
{
tdep->regoff[i] = off;
off += regsize (v->regs + i, wordsize);
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