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[PATCH 2/3] gdb: xtensa-linux: add call0 support
- From: Max Filippov <jcmvbkbc at gmail dot com>
- To: gdb-patches at sourceware dot org
- Cc: Maxim Grigoriev <maxim2405 at gmail dot com>, Woody LaRue <larue at cadence dot com>, Marc Gauthier <marc at cadence dot com>, Max Filippov <jcmvbkbc at gmail dot com>
- Date: Wed, 18 Jan 2017 15:50:37 -0800
- Subject: [PATCH 2/3] gdb: xtensa-linux: add call0 support
- Authentication-results: sourceware.org; auth=none
- References: <1484783438-13780-1-git-send-email-jcmvbkbc@gmail.com>
Correctly handle a0- registers. This allows debugging call0 code in
linux natively.
The register structure is the same for windowed and call0 ABIs because
currently linux kernel internally requires windowed registers, so they are
always present.
2017-01-18 Max Filippov <jcmvbkbc@gmail.com>
gdb/
* xtensa-linux-nat.c (C0_NREGS): New definition.
(fill_gregset): Call regcache_raw_collect for a single specified
register or for all registers in a0_base..a0_base + C0_NREGS
range.
(supply_gregset_reg): Call regcache_raw_supply for a single
specified register or for all registers in a0_base..a0_base +
C0_NREGS range.
---
gdb/xtensa-linux-nat.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
index afe15f6..2693939 100644
--- a/gdb/xtensa-linux-nat.c
+++ b/gdb/xtensa-linux-nat.c
@@ -45,6 +45,8 @@
hardware-specific overlays. */
#include "xtensa-xtregs.c"
+#define C0_NREGS 16 /* Number of A-registers to track. */
+
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regnum)
@@ -94,6 +96,20 @@ fill_gregset (const struct regcache *regcache,
gdbarch_tdep (gdbarch)->ar_base + i,
®s->ar[i]);
}
+ if (regnum >= gdbarch_tdep (gdbarch)->a0_base
+ && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
+ regcache_raw_collect (regcache, regnum,
+ ®s->ar[(4 * regs->windowbase + regnum
+ - gdbarch_tdep (gdbarch)->a0_base)
+ % gdbarch_tdep (gdbarch)->num_aregs]);
+ else if (regnum == -1)
+ {
+ for (i = 0; i < C0_NREGS; ++i)
+ regcache_raw_collect (regcache,
+ gdbarch_tdep (gdbarch)->a0_base + i,
+ ®s->ar[(4 * regs->windowbase + i)
+ % gdbarch_tdep (gdbarch)->num_aregs]);
+ }
}
static void
@@ -146,6 +162,20 @@ supply_gregset_reg (struct regcache *regcache,
gdbarch_tdep (gdbarch)->ar_base + i,
®s->ar[i]);
}
+ if (regnum >= gdbarch_tdep (gdbarch)->a0_base
+ && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
+ regcache_raw_supply (regcache, regnum,
+ ®s->ar[(4 * regs->windowbase + regnum
+ - gdbarch_tdep (gdbarch)->a0_base)
+ % gdbarch_tdep (gdbarch)->num_aregs]);
+ else if (regnum == -1)
+ {
+ for (i = 0; i < C0_NREGS; ++i)
+ regcache_raw_supply (regcache,
+ gdbarch_tdep (gdbarch)->a0_base + i,
+ ®s->ar[(4 * regs->windowbase + i)
+ % gdbarch_tdep (gdbarch)->num_aregs]);
+ }
}
void
--
2.1.4