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| author | andrew <andrew@FreeBSD.org> | 2015-07-02 14:00:07 +0000 |
|---|---|---|
| committer | andrew <andrew@FreeBSD.org> | 2015-07-02 14:00:07 +0000 |
| commit | d94acf5f31d660e36d6255504ac11ccc5354f838 (patch) | |
| tree | 03108120ee9df6f7b979deab5633c3efe345c2f8 /libexec | |
| parent | eab58cf8948c9cd5a8a76a6800b4a609e06d3659 (diff) | |
| download | FreeBSD-src-d94acf5f31d660e36d6255504ac11ccc5354f838.zip FreeBSD-src-d94acf5f31d660e36d6255504ac11ccc5354f838.tar.gz | |
Save & restore the floating-pont argument registers before calling
_rtld_bind. The compiler may generate code using these registers and not
save them. Unfortunately, as we make use of libc, we are unable to disallow
rtld from using floating-point register without also doing the same for the
parts of libc we use, or by limiting what _rtld_bind is able to call.
Obtained from: ABT Systems Ltd
Sponsored by: The FReeBSD Foundation
Diffstat (limited to 'libexec')
| -rw-r--r-- | libexec/rtld-elf/aarch64/rtld_start.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/libexec/rtld-elf/aarch64/rtld_start.S b/libexec/rtld-elf/aarch64/rtld_start.S index a5e0df5..2270efc 100644 --- a/libexec/rtld-elf/aarch64/rtld_start.S +++ b/libexec/rtld-elf/aarch64/rtld_start.S @@ -70,6 +70,12 @@ ENTRY(_rtld_bind_start) stp x6, x7, [sp, #-16]! stp x8, xzr, [sp, #-16]! + /* Save any floating-point arguments */ + stp q0, q1, [sp, #-32]! + stp q2, q3, [sp, #-32]! + stp q4, q5, [sp, #-32]! + stp q6, q7, [sp, #-32]! + /* Calculate reloff */ ldr x2, [x17, #0] /* Get the address of the entry */ sub x1, x2, x16 /* Find its offset */ @@ -85,12 +91,16 @@ ENTRY(_rtld_bind_start) bl _rtld_bind /* Restore the registers saved by the plt code */ - ldp xzr, x30, [sp, #(5 * 16)] + ldp xzr, x30, [sp, #(5 * 16 + 4 * 32)] /* Backup the address to branch to */ mov x16, x0 /* restore the arguments */ + ldp q6, q7, [sp], #32 + ldp q4, q5, [sp], #32 + ldp q2, q3, [sp], #32 + ldp q0, q1, [sp], #32 ldp x8, xzr, [sp], #16 ldp x6, x7, [sp], #16 ldp x4, x5, [sp], #16 |
