linux-kernel - [PATCH 05/41] [ia64] teach elf_access_reg() to handle the missing range (r16..r31)

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Message-Id: <20200629182628.529995-5-viro@ZenIV.linux.org.uk>
Date:   Mon, 29 Jun 2020 19:25:52 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Miller <davem@...emloft.net>,
        Tony Luck <tony.luck@...el.com>, Will Deacon <will@...nel.org>
Subject: [PATCH 05/41] [ia64] teach elf_access_reg() to handle the missing range (r16..r31)

From: Al Viro <viro@...iv.linux.org.uk>

Now it's easy to make elf_access_gpreg() handle the rest of global
registers (r16..r31).  That gets rid of the hole in the registers
elf_access_reg() can handle, which will allow to simplify its callers
later in the series.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 arch/ia64/kernel/ptrace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index b9d068903b98..37b5140d0dfe 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1273,12 +1273,14 @@ struct regset_getset {
 	int ret;
 };
 
-static const ptrdiff_t pt_offsets[16] =
+static const ptrdiff_t pt_offsets[32] =
 {
 #define R(n) offsetof(struct pt_regs, r##n)
 	[0] = -1, R(1), R(2), R(3),
 	[4] = -1, [5] = -1, [6] = -1, [7] = -1,
 	R(8), R(9), R(10), R(11), R(12), R(13), R(14), R(15),
+	R(16), R(17), R(18), R(19), R(20), R(21), R(22), R(23),
+	R(24), R(25), R(26), R(27), R(28), R(29), R(30), R(31),
 #undef R
 };
 
@@ -1479,7 +1481,7 @@ static int
 access_elf_reg(struct task_struct *target, struct unw_frame_info *info,
 		unsigned long addr, unsigned long *data, int write_access)
 {
-	if (addr >= ELF_GR_OFFSET(1) && addr <= ELF_GR_OFFSET(15))
+	if (addr >= ELF_GR_OFFSET(1) && addr <= ELF_GR_OFFSET(31))
 		return access_elf_gpreg(target, info, addr, data, write_access);
 	else if (addr >= ELF_BR_OFFSET(0) && addr <= ELF_BR_OFFSET(7))
 		return access_elf_breg(target, info, addr, data, write_access);
-- 
2.11.0