[Patch v8 5/5] perf dwarf-regs: Add SIMD/eGPRs support for x86 DWARF registers
From: Dapeng Mi
Date: Fri May 29 2026 - 04:35:47 EST
Enhance the x86-specific DWARF register handling by adding support for
SIMD and eGPRs registers.
This update is based on the "DWARF Register Number Mapping" table from
the "System V Application Binary Interface AMD64 Architecture Processor
Supplement" (version 1.0).
Modifications include:
- Updating the x86_64_regidx_table[] array to incorporate SIMD and eGPRs
registers.
- Enhancing the __get_dwarf_regnum_for_perf_regnum_x86_64() function to
retrieve the DWARF register index for eGPRs.
- Enlarge the x86_64 supported register number to 146 to cover eGPRs and
SIMD registers (get_libdw_frame_nregs()).
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
---
.../util/dwarf-regs-arch/dwarf-regs-x86.c | 138 +++++++++++++++---
tools/perf/util/dwarf-regs.c | 7 +-
tools/perf/util/include/dwarf-regs.h | 7 +-
tools/perf/util/unwind-libdw.c | 6 +-
4 files changed, 129 insertions(+), 29 deletions(-)
diff --git a/tools/perf/util/dwarf-regs-arch/dwarf-regs-x86.c b/tools/perf/util/dwarf-regs-arch/dwarf-regs-x86.c
index cadef120aeb4..b014a36d21b5 100644
--- a/tools/perf/util/dwarf-regs-arch/dwarf-regs-x86.c
+++ b/tools/perf/util/dwarf-regs-arch/dwarf-regs-x86.c
@@ -90,22 +90,22 @@ static const struct dwarf_regs_idx x86_64_regidx_table[] = {
{ "r14", 14 }, { "r14d", 14 }, { "r14w", 14 }, { "r14b", 14 },
{ "r15", 15 }, { "r15d", 15 }, { "r15w", 15 }, { "r15b", 15 },
// 16 - Return Address RA
- { "xmm0", 17},
- { "xmm1", 18},
- { "xmm2", 19},
- { "xmm3", 20},
- { "xmm4", 21},
- { "xmm5", 22},
- { "xmm6", 23},
- { "xmm7", 24},
- { "xmm8", 25},
- { "xmm9", 26},
- { "xmm10", 27},
- { "xmm11", 28},
- { "xmm12", 29},
- { "xmm13", 30},
- { "xmm14", 31},
- { "xmm15", 32},
+ { "zmm0", 17 }, { "ymm0", 17 }, { "xmm0", 17 },
+ { "zmm1", 18 }, { "ymm1", 18 }, { "xmm1", 18 },
+ { "zmm2", 19 }, { "ymm2", 19 }, { "xmm2", 19 },
+ { "zmm3", 20 }, { "ymm3", 20 }, { "xmm3", 20 },
+ { "zmm4", 21 }, { "ymm4", 21 }, { "xmm4", 21 },
+ { "zmm5", 22 }, { "ymm5", 22 }, { "xmm5", 22 },
+ { "zmm6", 23 }, { "ymm6", 23 }, { "xmm6", 23 },
+ { "zmm7", 24 }, { "ymm7", 24 }, { "xmm7", 24 },
+ { "zmm8", 25 }, { "ymm8", 25 }, { "xmm8", 25 },
+ { "zmm9", 26 }, { "ymm9", 26 }, { "xmm9", 26 },
+ { "zmm10", 27 }, { "ymm10", 27 }, { "xmm10", 27 },
+ { "zmm11", 28 }, { "ymm11", 28 }, { "xmm11", 28 },
+ { "zmm12", 29 }, { "ymm12", 29 }, { "xmm12", 29 },
+ { "zmm13", 30 }, { "ymm13", 30 }, { "xmm13", 30 },
+ { "zmm14", 31 }, { "ymm14", 31 }, { "xmm14", 31 },
+ { "zmm15", 32 }, { "ymm15", 32 }, { "xmm15", 32 },
{ "st0", 33},
{ "st1", 34},
{ "st2", 35},
@@ -129,7 +129,7 @@ static const struct dwarf_regs_idx x86_64_regidx_table[] = {
{ "ds", 53},
{ "fs", 54},
{ "gs", 55},
- // 56-47 - reserved
+ // 56-57 - reserved
{ "fs.base", 58},
{ "gs.base", 59},
// 60-61 - reserved
@@ -138,6 +138,49 @@ static const struct dwarf_regs_idx x86_64_regidx_table[] = {
{ "mxcsr", 64}, // 128-bit Media Control and Status
{ "fcw", 65}, // x87 Control Word
{ "fsw", 66}, // x87 Status Word
+ // 67-82 - Upper Vector Registers 16–31
+ { "zmm16", 67 }, { "ymm16", 67 }, { "xmm16", 67 },
+ { "zmm17", 68 }, { "ymm17", 68 }, { "xmm17", 68 },
+ { "zmm18", 69 }, { "ymm18", 69 }, { "xmm18", 69 },
+ { "zmm19", 70 }, { "ymm19", 70 }, { "xmm19", 70 },
+ { "zmm20", 71 }, { "ymm20", 71 }, { "xmm20", 71 },
+ { "zmm21", 72 }, { "ymm21", 72 }, { "xmm21", 72 },
+ { "zmm22", 73 }, { "ymm22", 73 }, { "xmm22", 73 },
+ { "zmm23", 74 }, { "ymm23", 74 }, { "xmm23", 74 },
+ { "zmm24", 75 }, { "ymm24", 75 }, { "xmm24", 75 },
+ { "zmm25", 76 }, { "ymm25", 76 }, { "xmm25", 76 },
+ { "zmm26", 77 }, { "ymm26", 77 }, { "xmm26", 77 },
+ { "zmm27", 78 }, { "ymm27", 78 }, { "xmm27", 78 },
+ { "zmm28", 79 }, { "ymm28", 79 }, { "xmm28", 79 },
+ { "zmm29", 80 }, { "ymm29", 80 }, { "xmm29", 80 },
+ { "zmm30", 81 }, { "ymm30", 81 }, { "xmm30", 81 },
+ { "zmm31", 82 }, { "ymm31", 82 }, { "xmm31", 82 },
+ // 118-125 - Vector Mask Registers 0–7
+ { "k0", 118 },
+ { "k1", 119 },
+ { "k2", 120 },
+ { "k3", 121 },
+ { "k4", 122 },
+ { "k5", 123 },
+ { "k6", 124 },
+ { "k7", 125 },
+ // 130-145 - APX Integer Registers 16-31
+ { "r16", 130 }, { "r16d", 130 }, { "r16w", 130 }, { "r16b", 130 },
+ { "r17", 131 }, { "r17d", 131 }, { "r17w", 131 }, { "r17b", 131 },
+ { "r18", 132 }, { "r18d", 132 }, { "r18w", 132 }, { "r18b", 132 },
+ { "r19", 133 }, { "r19d", 133 }, { "r19w", 133 }, { "r19b", 133 },
+ { "r20", 134 }, { "r20d", 134 }, { "r20w", 134 }, { "r20b", 134 },
+ { "r21", 135 }, { "r21d", 135 }, { "r21w", 135 }, { "r21b", 135 },
+ { "r22", 136 }, { "r22d", 136 }, { "r22w", 136 }, { "r22b", 136 },
+ { "r23", 137 }, { "r23d", 137 }, { "r23w", 137 }, { "r23b", 137 },
+ { "r24", 138 }, { "r24d", 138 }, { "r24w", 138 }, { "r24b", 138 },
+ { "r25", 139 }, { "r25d", 139 }, { "r25w", 139 }, { "r25b", 139 },
+ { "r26", 140 }, { "r26d", 140 }, { "r26w", 140 }, { "r26b", 140 },
+ { "r27", 141 }, { "r27d", 141 }, { "r27w", 141 }, { "r27b", 141 },
+ { "r28", 142 }, { "r28d", 142 }, { "r28w", 142 }, { "r28b", 142 },
+ { "r29", 143 }, { "r29d", 143 }, { "r29w", 143 }, { "r29b", 143 },
+ { "r30", 144 }, { "r30d", 144 }, { "r30w", 144 }, { "r30b", 144 },
+ { "r31", 145 }, { "r31d", 145 }, { "r31w", 145 }, { "r31b", 145 },
// End of regular dwarf registers.
{ "rip", DWARF_REG_PC }, { "eip", DWARF_REG_PC }, { "ip", DWARF_REG_PC },
};
@@ -204,7 +247,7 @@ int __get_dwarf_regnum_for_perf_regnum_i386(int perf_regnum)
return dwarf_i386_regnums[perf_regnum];
}
-int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum)
+int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum, int abi)
{
static const int dwarf_x86_64_regnums[] = {
[PERF_REG_X86_AX] = 0,
@@ -248,13 +291,66 @@ int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum)
[PERF_REG_X86_XMM14] = 31,
[PERF_REG_X86_XMM15] = 32,
};
+ static const int dwarf_x86_64_regnums_apx[] = {
+ [PERF_REG_X86_AX] = 0,
+ [PERF_REG_X86_BX] = 3,
+ [PERF_REG_X86_CX] = 2,
+ [PERF_REG_X86_DX] = 1,
+ [PERF_REG_X86_SI] = 4,
+ [PERF_REG_X86_DI] = 5,
+ [PERF_REG_X86_BP] = 6,
+ [PERF_REG_X86_SP] = 7,
+ [PERF_REG_X86_IP] = 16,
+ [PERF_REG_X86_FLAGS] = 49,
+ [PERF_REG_X86_CS] = 51,
+ [PERF_REG_X86_SS] = 52,
+ [PERF_REG_X86_DS] = 53,
+ [PERF_REG_X86_ES] = 50,
+ [PERF_REG_X86_FS] = 54,
+ [PERF_REG_X86_GS] = 55,
+ [PERF_REG_X86_R8] = 8,
+ [PERF_REG_X86_R9] = 9,
+ [PERF_REG_X86_R10] = 10,
+ [PERF_REG_X86_R11] = 11,
+ [PERF_REG_X86_R12] = 12,
+ [PERF_REG_X86_R13] = 13,
+ [PERF_REG_X86_R14] = 14,
+ [PERF_REG_X86_R15] = 15,
+ [PERF_REG_X86_R16] = 130,
+ [PERF_REG_X86_R17] = 131,
+ [PERF_REG_X86_R18] = 132,
+ [PERF_REG_X86_R19] = 133,
+ [PERF_REG_X86_R20] = 134,
+ [PERF_REG_X86_R21] = 135,
+ [PERF_REG_X86_R22] = 136,
+ [PERF_REG_X86_R23] = 137,
+ [PERF_REG_X86_R24] = 138,
+ [PERF_REG_X86_R25] = 139,
+ [PERF_REG_X86_R26] = 140,
+ [PERF_REG_X86_R27] = 141,
+ [PERF_REG_X86_R28] = 142,
+ [PERF_REG_X86_R29] = 143,
+ [PERF_REG_X86_R30] = 144,
+ [PERF_REG_X86_R31] = 145,
+ };
if (perf_regnum == 0)
return 0;
- if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_x86_64_regnums) ||
- dwarf_x86_64_regnums[perf_regnum] == 0)
+ if (perf_regnum < 0)
+ return -ENOENT;
+
+ if (!(abi & PERF_SAMPLE_REGS_ABI_SIMD) &&
+ (perf_regnum >= (int)ARRAY_SIZE(dwarf_x86_64_regnums) ||
+ dwarf_x86_64_regnums[perf_regnum] == 0))
+ return -ENOENT;
+
+ if ((abi & PERF_SAMPLE_REGS_ABI_SIMD) &&
+ (perf_regnum >= (int)ARRAY_SIZE(dwarf_x86_64_regnums_apx) ||
+ dwarf_x86_64_regnums_apx[perf_regnum] == 0))
return -ENOENT;
- return dwarf_x86_64_regnums[perf_regnum];
+ return abi & PERF_SAMPLE_REGS_ABI_SIMD ?
+ dwarf_x86_64_regnums_apx[perf_regnum] :
+ dwarf_x86_64_regnums[perf_regnum];
}
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 797f455eba0d..9e2a0c93ecc9 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -158,7 +158,7 @@ static int get_libdw_frame_nregs(unsigned int machine, unsigned int flags __mayb
{
switch (machine) {
case EM_X86_64:
- return 17;
+ return 146; /* Support APX eGPRs. */
case EM_386:
return 9;
case EM_ARM:
@@ -187,13 +187,14 @@ static int get_libdw_frame_nregs(unsigned int machine, unsigned int flags __mayb
}
int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine,
- unsigned int flags, bool only_libdw_supported)
+ unsigned int flags,
+ bool only_libdw_supported, int abi)
{
int reg;
switch (machine) {
case EM_X86_64:
- reg = __get_dwarf_regnum_for_perf_regnum_x86_64(perf_regnum);
+ reg = __get_dwarf_regnum_for_perf_regnum_x86_64(perf_regnum, abi);
break;
case EM_386:
reg = __get_dwarf_regnum_for_perf_regnum_i386(perf_regnum);
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 46a764cf322f..92cf0af93e9e 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -103,7 +103,7 @@ int __get_csky_regnum(const char *name, unsigned int flags);
int __get_dwarf_regnum_i386(const char *name);
int __get_dwarf_regnum_x86_64(const char *name);
int __get_dwarf_regnum_for_perf_regnum_i386(int perf_regnum);
-int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum);
+int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum, int abi);
int __get_dwarf_regnum_for_perf_regnum_arm(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_arm64(int perf_regnum);
@@ -125,8 +125,9 @@ int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags)
/*
* get_dwarf_regnum - Returns DWARF regnum from perf register number.
*/
-int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine, unsigned int flags,
- bool only_libdw_supported);
+int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine,
+ unsigned int flags,
+ bool only_libdw_supported, int abi);
void get_powerpc_regs(u32 raw_insn, int is_source, struct annotated_op_loc *op_loc);
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 05e8e68bd49c..678db5a65ada 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -273,7 +273,8 @@ static bool libdw_set_initial_registers(Dwfl_Thread *thread, void *arg)
int dwarf_reg =
get_dwarf_regnum_for_perf_regnum(perf_reg, e_machine,
e_flags,
- /*only_libdw_supported=*/true);
+ /*only_libdw_supported=*/true,
+ user_regs->abi);
if (dwarf_reg > max_dwarf_reg)
max_dwarf_reg = dwarf_reg;
}
@@ -288,7 +289,8 @@ static bool libdw_set_initial_registers(Dwfl_Thread *thread, void *arg)
int dwarf_reg =
get_dwarf_regnum_for_perf_regnum(perf_reg, e_machine,
e_flags,
- /*only_libdw_supported=*/true);
+ /*only_libdw_supported=*/true,
+ user_regs->abi);
if (dwarf_reg >= 0) {
val = 0;
if (perf_reg_value(&val, user_regs, perf_reg) == 0)
--
2.34.1