| Message ID | 1271303822-11542-3-git-send-email-imunsie@au.ibm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
Ian Munsie wrote: > From: Ian Munsie <imunsie@au.ibm.com> > > This patch adds mappings from the register numbers from DWARF to the > register names used in the PowerPC Regs and Stack Access API. This > allows perf probe to be used to record variable contents on PowerPC. > > This patch depends on functionality in the powerpc/next tree, though it > will compile fine without it. Specifically this patch depends on commit > "powerpc: Add kprobe-based event tracer" > > Signed-off-by: Ian Munsie <imunsie@au.ibm.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Thank you! > --- > tools/perf/arch/powerpc/Makefile | 2 + > tools/perf/arch/powerpc/util/dwarf-regs.c | 88 +++++++++++++++++++++++++++++ > 2 files changed, 90 insertions(+), 0 deletions(-) > create mode 100644 tools/perf/arch/powerpc/Makefile > create mode 100644 tools/perf/arch/powerpc/util/dwarf-regs.c > > diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile > new file mode 100644 > index 0000000..cbd7833 > --- /dev/null > +++ b/tools/perf/arch/powerpc/Makefile > @@ -0,0 +1,2 @@ > +PERF_HAVE_DWARF_REGS := 1 > +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o > diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c > new file mode 100644 > index 0000000..48ae0c5 > --- /dev/null > +++ b/tools/perf/arch/powerpc/util/dwarf-regs.c > @@ -0,0 +1,88 @@ > +/* > + * Mapping of DWARF debug register numbers into register names. > + * > + * Copyright (C) 2010 Ian Munsie, IBM Corporation. > + * > + * 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 <libio.h> > +#include <dwarf-regs.h> > + > + > +struct pt_regs_dwarfnum { > + const char *name; > + unsigned int dwarfnum; > +}; > + > +#define STR(s) #s > +#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} > +#define GPR_DWARFNUM_NAME(num) \ > + {.name = STR(%gpr##num), .dwarfnum = num} > +#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} > + > +/* > + * Reference: > + * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html > + */ > +static const struct pt_regs_dwarfnum regdwarfnum_table[] = { > + GPR_DWARFNUM_NAME(0), > + GPR_DWARFNUM_NAME(1), > + GPR_DWARFNUM_NAME(2), > + GPR_DWARFNUM_NAME(3), > + GPR_DWARFNUM_NAME(4), > + GPR_DWARFNUM_NAME(5), > + GPR_DWARFNUM_NAME(6), > + GPR_DWARFNUM_NAME(7), > + GPR_DWARFNUM_NAME(8), > + GPR_DWARFNUM_NAME(9), > + GPR_DWARFNUM_NAME(10), > + GPR_DWARFNUM_NAME(11), > + GPR_DWARFNUM_NAME(12), > + GPR_DWARFNUM_NAME(13), > + GPR_DWARFNUM_NAME(14), > + GPR_DWARFNUM_NAME(15), > + GPR_DWARFNUM_NAME(16), > + GPR_DWARFNUM_NAME(17), > + GPR_DWARFNUM_NAME(18), > + GPR_DWARFNUM_NAME(19), > + GPR_DWARFNUM_NAME(20), > + GPR_DWARFNUM_NAME(21), > + GPR_DWARFNUM_NAME(22), > + GPR_DWARFNUM_NAME(23), > + GPR_DWARFNUM_NAME(24), > + GPR_DWARFNUM_NAME(25), > + GPR_DWARFNUM_NAME(26), > + GPR_DWARFNUM_NAME(27), > + GPR_DWARFNUM_NAME(28), > + GPR_DWARFNUM_NAME(29), > + GPR_DWARFNUM_NAME(30), > + GPR_DWARFNUM_NAME(31), > + REG_DWARFNUM_NAME("%msr", 66), > + REG_DWARFNUM_NAME("%ctr", 109), > + REG_DWARFNUM_NAME("%link", 108), > + REG_DWARFNUM_NAME("%xer", 101), > + REG_DWARFNUM_NAME("%dar", 119), > + REG_DWARFNUM_NAME("%dsisr", 118), > + REG_DWARFNUM_END, > +}; > + > +/** > + * get_arch_regstr() - lookup register name from it's DWARF register number > + * @n: the DWARF register number > + * > + * get_arch_regstr() returns the name of the register in struct > + * regdwarfnum_table from it's DWARF register number. If the register is not > + * found in the table, this returns NULL; > + */ > +const char *get_arch_regstr(unsigned int n) > +{ > + const struct pt_regs_dwarfnum *roff; > + for (roff = regdwarfnum_table; roff->name != NULL; roff++) > + if (roff->dwarfnum == n) > + return roff->name; > + return NULL; > +}
diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile new file mode 100644 index 0000000..cbd7833 --- /dev/null +++ b/tools/perf/arch/powerpc/Makefile @@ -0,0 +1,2 @@ +PERF_HAVE_DWARF_REGS := 1 +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c new file mode 100644 index 0000000..48ae0c5 --- /dev/null +++ b/tools/perf/arch/powerpc/util/dwarf-regs.c @@ -0,0 +1,88 @@ +/* + * Mapping of DWARF debug register numbers into register names. + * + * Copyright (C) 2010 Ian Munsie, IBM Corporation. + * + * 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 <libio.h> +#include <dwarf-regs.h> + + +struct pt_regs_dwarfnum { + const char *name; + unsigned int dwarfnum; +}; + +#define STR(s) #s +#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} +#define GPR_DWARFNUM_NAME(num) \ + {.name = STR(%gpr##num), .dwarfnum = num} +#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} + +/* + * Reference: + * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html + */ +static const struct pt_regs_dwarfnum regdwarfnum_table[] = { + GPR_DWARFNUM_NAME(0), + GPR_DWARFNUM_NAME(1), + GPR_DWARFNUM_NAME(2), + GPR_DWARFNUM_NAME(3), + GPR_DWARFNUM_NAME(4), + GPR_DWARFNUM_NAME(5), + GPR_DWARFNUM_NAME(6), + GPR_DWARFNUM_NAME(7), + GPR_DWARFNUM_NAME(8), + GPR_DWARFNUM_NAME(9), + GPR_DWARFNUM_NAME(10), + GPR_DWARFNUM_NAME(11), + GPR_DWARFNUM_NAME(12), + GPR_DWARFNUM_NAME(13), + GPR_DWARFNUM_NAME(14), + GPR_DWARFNUM_NAME(15), + GPR_DWARFNUM_NAME(16), + GPR_DWARFNUM_NAME(17), + GPR_DWARFNUM_NAME(18), + GPR_DWARFNUM_NAME(19), + GPR_DWARFNUM_NAME(20), + GPR_DWARFNUM_NAME(21), + GPR_DWARFNUM_NAME(22), + GPR_DWARFNUM_NAME(23), + GPR_DWARFNUM_NAME(24), + GPR_DWARFNUM_NAME(25), + GPR_DWARFNUM_NAME(26), + GPR_DWARFNUM_NAME(27), + GPR_DWARFNUM_NAME(28), + GPR_DWARFNUM_NAME(29), + GPR_DWARFNUM_NAME(30), + GPR_DWARFNUM_NAME(31), + REG_DWARFNUM_NAME("%msr", 66), + REG_DWARFNUM_NAME("%ctr", 109), + REG_DWARFNUM_NAME("%link", 108), + REG_DWARFNUM_NAME("%xer", 101), + REG_DWARFNUM_NAME("%dar", 119), + REG_DWARFNUM_NAME("%dsisr", 118), + REG_DWARFNUM_END, +}; + +/** + * get_arch_regstr() - lookup register name from it's DWARF register number + * @n: the DWARF register number + * + * get_arch_regstr() returns the name of the register in struct + * regdwarfnum_table from it's DWARF register number. If the register is not + * found in the table, this returns NULL; + */ +const char *get_arch_regstr(unsigned int n) +{ + const struct pt_regs_dwarfnum *roff; + for (roff = regdwarfnum_table; roff->name != NULL; roff++) + if (roff->dwarfnum == n) + return roff->name; + return NULL; +}