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authorLuis Machado <luis.machado@linaro.org>2020-03-18 13:06:05 -0300
committerLuis Machado <luis.machado@linaro.org>2020-12-10 11:45:08 -0300
commit6afcd2d4161165fd976c55a9792dbcccd2d5d106 (patch)
treefb937c4e5014dfc25d5b05162d78f5e13af25f4c /gdb/arch
parent15cc148fb817bc1eb91aa16e5d94e39ebafc11ee (diff)
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[AArch64] SVE/FPSIMD fixup for big endian
The FPSIMD dump in signal frames and ptrace FPSIMD dump in the SVE context structure follows the target endianness, whereas the SVE dumps are endianness-independent (LE). Therefore, when the system is in BE mode, we need to reverse the bytes for the FPSIMD data. Given the V registers are larger than 64-bit, I've added a way for value bytes to be set, as opposed to passing a 64-bit fixed quantity. This fits nicely with the unwinding *_got_bytes function and makes the trad-frame more flexible and capable of saving larger registers. The memory for the bytes is allocated via the frame obstack, so it gets freed after we're done inspecting the frame. gdb/ChangeLog: 2020-12-10 Luis Machado <luis.machado@linaro.org> * aarch64-linux-tdep.c (aarch64_linux_restore_vreg) New function. (aarch64_linux_sigframe_init): Call aarch64_linux_restore_vreg. * aarch64-tdep.h (V_REGISTER_SIZE): Move to ... * arch/aarch64.h: ... here. * nat/aarch64-sve-linux-ptrace.c: Include endian.h. (aarch64_maybe_swab128): New function. (aarch64_sve_regs_copy_to_reg_buf) (aarch64_sve_regs_copy_from_reg_buf): Adjust FPSIMD entries. * trad-frame.c (trad_frame_reset_saved_regs): Initialize the data field. (TF_REG_VALUE_BYTES): New enum value. (trad_frame_value_bytes_p): New function. (trad_frame_set_value_bytes): New function. (trad_frame_set_reg_value_bytes): New function. (trad_frame_get_prev_register): Handle register values saved as bytes. * trad-frame.h (trad_frame_set_reg_value_bytes): New prototype. (struct trad_frame_saved_reg) <data>: New field. (trad_frame_set_value_bytes): New prototype. (trad_frame_value_bytes_p): New prototype.
Diffstat (limited to 'gdb/arch')
-rw-r--r--gdb/arch/aarch64.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/gdb/arch/aarch64.h b/gdb/arch/aarch64.h
index 857bb22..b753524 100644
--- a/gdb/arch/aarch64.h
+++ b/gdb/arch/aarch64.h
@@ -58,6 +58,8 @@ enum aarch64_regnum
AARCH64_LAST_V_ARG_REGNUM = AARCH64_V0_REGNUM + 7
};
+#define V_REGISTER_SIZE 16
+
/* Pseudo register base numbers. */
#define AARCH64_Q0_REGNUM 0
#define AARCH64_D0_REGNUM (AARCH64_Q0_REGNUM + AARCH64_D_REGISTER_COUNT)